Learn React Basics in 10 Minutes

Joe Liang

If you want to learn the basics of React in the time it takes you to drink a cup of coffee, this post is for you.

This article aims to provide a beginner-friendly introduction to React, what it is, and why we need it. It assumes you have some understanding of basic JavaScript .

We will discuss some of its basic concepts and go over what you can build with React.

We will also discuss some code, but the overall goal is to gain an intuitive understanding of what React is all about so that you get comfortable with the basics.

What is React?

Developed by Facebook in 2011, React has quickly become one of the most widely used JavaScript libraries. According to HackerRank , 30% of employers look for developers who know React but only about half of the applicants actually have the required knowledge.

Clearly, React is in high demand in the job market.

So what exactly is React?

React is an efficient and flexible JavaScript library for building user interfaces (and React itself is written using JavaScript). It breaks down complex UIs into small, isolated code called “components”. By using these components, React only concerns itself with what you see on the front page of a website.

React components

Components are independent and reusable. They can either be JavaScript functions or classes. Either way, they both return a piece of code that represents part of a web page.

Here’s an example of a function component that renders a <h2> element onto the page:

And here is a class component doing the same rendering:

Using a class component takes slightly more effort in that you have to extend React.Component (part of the React library) while a function component is mostly plain JavaScript. However, class components provide certain critical functionalities that function components lack (see Functional vs Class-Components in React ).

You may have noticed that there is a strange mixture of HTML and JavaScript inside each component. React actually uses a language called JSX that allows HTML to be mixed with JavaScript.

Not only can you use JSX to return pre-defined HTML elements, you can also create your own. For example, instead of rendering <h2> elements directly in the class component, you can render the functional component which returns the same thing:

Note the self-closing ‘/>’ of the component.

The power of React starts to become more evident as you can imagine rendering many simple components to form a more complex one.

To build a page, we can call these components in a certain order, use the results they return, and display them to the user.

Why Choose React Over Vanilla JavaScript?

Being able to break down complex UIs through the use of components gives React an edge over vanilla JavaScript (plain JS without any external libraries or frameworks). But what else can React do that places it in such high demand among employers?

Let’s take a look at the differences between how React and vanilla JS handle things.

In the previous section, we discussed how React uses components to render UIs. We did not delve into what was happening on the HTML side of things. It may be surprising to learn that the HTML code that pairs with React is really simple:

It is usually just a <div> element with an id that serves as a container for a React app. When React renders its components, it will look for this id to render to. The page is empty before this rendering.

Vanilla JS, on the other hand, defines the initial UI right in the HTML.

In addition, vanilla JS takes care of functionality while HTML takes care of displaying content (markup).

In the earlier days of the web, the separation of functionality and markup sounded logical as apps were simpler. However, as complexity grew so did the headaches of maintaining large pieces of JS code.

JS code that updates a piece of HTML can be spread across several files, and developers may have a hard time keeping track of where the code came from. They have to keep things straight in their heads of all the interactions between the code that resides in different files.

React sorts the code into components, where each component maintains all the code needed to both display and update the UI.

Updating the UI requires updating the DOM, or document object model (see DOM Manipulation Using JavaScript ). This is where React truly shines.

If you want to access the DOM in vanilla JS, you have to first find it before it can be used. React stores the data in regular JS variables and maintains its own virtual DOM.

If you want to then update the DOM in vanilla JS, you have to locate the appropriate node and then manually append or remove elements. React automatically updates the UI based on the application state, which we will discuss in more detail in the next section.

So the primary reason why we may want to use React over vanilla JS can be summarized in one word: simplicity.

With vanilla JS, it’s easy to get lost in a maze of DOM searches and updates. React forces you to break down your app into components which produces more maintainable code.

Thus, for complex apps you will definitely want to learn React.

Basic React Concepts

We have already discussed how React uses components to break down complex UIs and JSX to render those components.

In this section we will talk about some more fundamental concepts of React.

As mentioned previously, React updates the UI based on the application state. This state is actually stored as a property of a React class component:

Suppose we have a counter and 2 buttons that either increment or decrement. The value of the counter is rendered onto the page through JSX.

The display counter value is based on the state and we change the state by clicking one of the buttons. Vanilla JS treats a button click as an event and so does React. When such an event occurs, we will call functions that either increment or decrement the counter based on the button clicked. These functions have the code that changes the component state.

Here’s an example of such a counter:

We updated the state by calling setState in each of the functions handling a button click. The counter displayed on the page will update in real time. Thus, React gets its name because it reacts to state changes.

In short, React automatically monitors every component state for changes and updates the DOM appropriately.

We can use props (short for "properties") to allow components to talk to each other.

Suppose the counter in our previous example represents the quantity of a product a customer wishes to purchase. The store wants to place a limit of 2 products purchased per customer. At checkout, we want to display an appropriate message if the customer tries to purchase more than 2.

Here’s how we may do it with props:

We create a functional component called Display and pass props as a parameter. When we render this component, we pass to it number as an attribute set to the quantity of the product a customer wants to purchase. This is similar to setting an attribute of an HTML tag. We call this value with props.number in Display to determine what message to return.

Component Lifecycle

As React updates the DOM based on component states, special methods called lifecycle methods exist to provide opportunities to perform actions at specific points in the lifecycle of a component.

They allow you to catch components at a certain point in time to call appropriate functions. These points of time can be before components are rendered, after they are updated, etc. You may want to explore a component’s lifecycle methods .

To see lifecycle methods in action, you can check out this Pomodoro Clock I made.

The clock timer is initially set to the session length. When the session timer counts down to zero, the timer needs to switch to the break length and start counting down from there.

Since the timer is a component, I used the lifecycle method componentDidUpdate within my main class component to handle any changes with handleChange() :

You can think of lifecycle methods as adding event listeners in vanilla JS to a React component.

What Can You Build with React?

So now you have a basic understanding of React, what can you build with it?

We already mentioned in the beginning of this post that Facebook developed React in 2011, so naturally the Facebook platform is based on React. Other famous apps that either completely or partially use React include Instagram, Netflix, and Whatsapp.

But as beginners of React, we are not looking to immediately build the next Facebook so here’s a list of 10 React Starter Project Ideas to Get You Coding .

If you want to learn more about web development and check out some examples of beginner-friendly React projects, visit my blog at 1000 Mile World .

Thanks for reading and happy coding!

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Describing the UI

React is a JavaScript library for rendering user interfaces (UI). UI is built from small units like buttons, text, and images. React lets you combine them into reusable, nestable components. From web sites to phone apps, everything on the screen can be broken down into components. In this chapter, you’ll learn to create, customize, and conditionally display React components.

In this chapter

  • How to write your first React component
  • When and how to create multi-component files
  • How to add markup to JavaScript with JSX
  • How to use curly braces with JSX to access JavaScript functionality from your components
  • How to configure components with props
  • How to conditionally render components
  • How to render multiple components at a time
  • How to avoid confusing bugs by keeping components pure
  • Why understanding your UI as trees is useful

Your first component

React applications are built from isolated pieces of UI called components . A React component is a JavaScript function that you can sprinkle with markup. Components can be as small as a button, or as large as an entire page. Here is a Gallery component rendering three Profile components:

Ready to learn this topic?

Read Your First Component to learn how to declare and use React components.

Importing and exporting components

You can declare many components in one file, but large files can get difficult to navigate. To solve this, you can export a component into its own file, and then import that component from another file:

Read Importing and Exporting Components to learn how to split components into their own files.

Writing markup with JSX

Each React component is a JavaScript function that may contain some markup that React renders into the browser. React components use a syntax extension called JSX to represent that markup. JSX looks a lot like HTML, but it is a bit stricter and can display dynamic information.

If we paste existing HTML markup into a React component, it won’t always work:

If you have existing HTML like this, you can fix it using a converter :

Read Writing Markup with JSX to learn how to write valid JSX.

JavaScript in JSX with curly braces

JSX lets you write HTML-like markup inside a JavaScript file, keeping rendering logic and content in the same place. Sometimes you will want to add a little JavaScript logic or reference a dynamic property inside that markup. In this situation, you can use curly braces in your JSX to “open a window” to JavaScript:

Read JavaScript in JSX with Curly Braces to learn how to access JavaScript data from JSX.

Passing props to a component

React components use props to communicate with each other. Every parent component can pass some information to its child components by giving them props. Props might remind you of HTML attributes, but you can pass any JavaScript value through them, including objects, arrays, functions, and even JSX!

Read Passing Props to a Component to learn how to pass and read props.

Conditional rendering

Your components will often need to display different things depending on different conditions. In React, you can conditionally render JSX using JavaScript syntax like if statements, && , and ? : operators.

In this example, the JavaScript && operator is used to conditionally render a checkmark:

Read Conditional Rendering to learn the different ways to render content conditionally.

Rendering lists

You will often want to display multiple similar components from a collection of data. You can use JavaScript’s filter() and map() with React to filter and transform your array of data into an array of components.

For each array item, you will need to specify a key . Usually, you will want to use an ID from the database as a key . Keys let React keep track of each item’s place in the list even if the list changes.

Read Rendering Lists to learn how to render a list of components, and how to choose a key.

Keeping components pure

Some JavaScript functions are pure. A pure function:

  • Minds its own business. It does not change any objects or variables that existed before it was called.
  • Same inputs, same output. Given the same inputs, a pure function should always return the same result.

By strictly only writing your components as pure functions, you can avoid an entire class of baffling bugs and unpredictable behavior as your codebase grows. Here is an example of an impure component:

You can make this component pure by passing a prop instead of modifying a preexisting variable:

Read Keeping Components Pure to learn how to write components as pure, predictable functions.

Your UI as a tree

React uses trees to model the relationships between components and modules.

A React render tree is a representation of the parent and child relationship between components.

A tree graph with five nodes, with each node representing a component. The root node is located at the top the tree graph and is labelled 'Root Component'. It has two arrows extending down to two nodes labelled 'Component A' and 'Component C'. Each of the arrows is labelled with 'renders'. 'Component A' has a single 'renders' arrow to a node labelled 'Component B'. 'Component C' has a single 'renders' arrow to a node labelled 'Component D'.

An example React render tree.

Components near the top of the tree, near the root component, are considered top-level components. Components with no child components are leaf components. This categorization of components is useful for understanding data flow and rendering performance.

Modelling the relationship between JavaScript modules is another useful way to understand your app. We refer to it as a module dependency tree.

A tree graph with five nodes. Each node represents a JavaScript module. The top-most node is labelled 'RootModule.js'. It has three arrows extending to the nodes: 'ModuleA.js', 'ModuleB.js', and 'ModuleC.js'. Each arrow is labelled as 'imports'. 'ModuleC.js' node has a single 'imports' arrow that points to a node labelled 'ModuleD.js'.

An example module dependency tree.

A dependency tree is often used by build tools to bundle all the relevant JavaScript code for the client to download and render. A large bundle size regresses user experience for React apps. Understanding the module dependency tree is helpful to debug such issues.

Read Your UI as a Tree to learn how to create a render and module dependency trees for a React app and how they’re useful mental models for improving user experience and performance.

What’s next?

Head over to Your First Component to start reading this chapter page by page!

Or, if you’re already familiar with these topics, why not read about Adding Interactivity ?

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Anatomy of a Typed React Component

It’s no secret that learning JavaScript (and React) in 2020 is confusing at best and downright intimidating at worst. Multiple technologies, tools, and approaches tend to get bundled together in React tutorials, and if you haven’t written JavaScript for a few years, it can feel like a totally new landscape.

In this post, I wanted to take a look at a very simple React component and walk step-by-step through the parts of the code that are unique to either:

  • Typed programming (using type checkers such as Flow or TypeScript )
  • “Modern” JavaScript (what’s often referred to as “ES6”, but essentially covers any JavaScript language features that have changed since around 2013, which is when I first started learning JavaScript in jQuery’s heyday)

Here’s what we’ll be looking at, with some markers/annotations in place:

This post assumes some level of competancy with JavaScript, and some of you may be familiar with the concepts ahead. If you notice anything erroneous in my explanations, feel free to suggest changes .

Table of Contents

Arrow functions, destructuring assignment, type signatures, react and jsx, wrapping up.

The first marker in our code highlights a keyword that may be new to you: const .

Constants in JavaScript are essentially variables which, once assigned, cannot be changed. In the past you may have written or seen code that looks like this:

There are sometimes cases where you need to change a variable after it’s been assigned; but most of the time, once it’s been set, you don’t need to change it. In fact, leaving it open to change can result in unexpected results. This is where constants can come in handy.

Nowadays, many people follow a rule of “always prefer const ”. If you do need to assign a variable that may need to change later, let is another keyword that is preferred over var :

There are some more differences worth learning about between var , let , and const , and plenty of material already written on the subject.

Let’s keep on going through that first line, but omitting the Props part for now.

This is a relatively new expression pattern called arrow functions . You may be used to seeing or writing functions like this:

Arrow functions are “syntactical sugar” that lets you create functions without the need to use the function keyword. We can rewrite the above add function using arrow functions like this:

For simple functions, like add , arrow functions can be a little easier to read since it lets you see the arguments and returned value in just one line. (Notice also that we can omit the {} curly braces and return keyword for simple expressions.)

One important thing to note about arrow functions is that they come without bindings to the this value. The this value is essentially a value representing the context from which a function or expression is called, and arrow functions somewhat skip a level:

For the most part, this shouldn’t have much of an impact on your day-to-day JavaScript, but it’s worth calling out as the cause of some occasional bugs when dealing with functions.

Something new is going on in the arguments for that arrow function:

This expression is called a “destructuring assignment”, and it makes a bit more sense in a slightly different form:

You likely already know that curly braces in JavaScript can be used to initialize an Object . What you’re seeing above isn’t altogether different; what this expression is doing is assigning the properties children and hasPadding of the object props to new variables with the same name. It’s the same as writing this:

The syntax also works for arrays:

Like with arrow functions, destructuring assignment is a convenient syntactical sugar that helps us write less, and often (though not always) more readable, code.

One more thing to know about destructuring assignment is that you can assign any remaining values in an object or an array using what’s called a spread operator . It looks like this:

Let’s look at one last part of the first line of our React component, indicated at marker 3 in our code snippet at the top:

This is the first non-native-JavaScript part of our code so far! Everything you’ve seen up to this point is totally valid, modern JavaScript. What you’re seeing here is called a type expression , and for JavaScript to understand it, the code would first need to be run through a type checker, such as Flow or TypeScript .

I’ve written a little about typed programming before, but here’s a brief primer for those unfamiliar. When code is “typed”, it doesn’t mean “typed with a keyboard”, but that the values that are created and passed around a program have expected types that describe the kind of values they represent.

Here are some example type expressions :

What this tells the type checker (and the people reading or editing this code) is that the variable myNumber should be a number type, and myString should be a string type. We can intentionally introduce an error into this code:

The type checker would helpfully let us know that the value 42 is incompatible with the requested type string .

Looking back at our add function from the arrow functions section, we can take a look at how types can help us write safer code. For example, it doesn’t make sense for the add function to add together a string and a number:

Introducing type signatures to our code can help us avoid this error:

Let’s take a look back at our React component.

From the type signature, we can see that the object containing the properties children and hasPadding should be an object matching the Props type. If we rewrite the code so it doesn’t use a destructuring assignment, that may be a bit easier to see:

I haven’t included the type definition for Props yet, but let’s imagine it looks something like this:

The Props definition tells me that the argument passed to Component should be an object with the following properties:

  • children , which is an optional property (as indicated by the question mark in children?: ) and should have a value of the React.ReactNode type
  • hasPadding , which is a Boolean ( true or false )
  • onClick , which is an optional property and should be a function that has no return value ( void )

As you can see, the Props definition has more information about the properties passed to the component. Not only does this help me understand the component a little more, but TypeScript will also warn me if I use the component incorrectly:

We’re skipping ahead here, but trying to use Component in React without giving values for children or hasPadding shows an error, and we have another error for the value of onClick .

Whew, 1,500 words into this post and we’ve only covered a single line of code! Hopefully the explanations so far have helped you develop a better sense for how to understand more modern JavaScript code and typed JavaScript. Now, we’re going to get into the meat of React and a syntactical sugar introduced by React called JSX .

Let’s look again at our original Component definition:

The first two lines should now be familiar to you.

  • In the first line we’ll instantiate a constant Component with a value that is a function. The function accepts a single argument with the type of Props . We’ll destructure that argument into two values, children and hasPadding .
  • We’ll begin the return statement, which continues onto the next line(s)

And this is where things get interesting. Right away, we see <div> in the return value, which is odd. The < symbol is a logical operator in JavaScript, used to compare values—in this case, it checks that the left-hand value is less than the right-hand value. But in this case, there is no left-hand value, and div isn’t something we’ve defined—what’s going on?

You may recognise <div> as HTML code, which is a good hunch! What you’re seeing is another syntactical sugar, introduced by React, called JSX . JSX lets you write HTML-like code inside JavaScript.

When a code compiler encounters JSX, it gets transformed into a format that native JavaScript can understand, similar to how typed code needs to be run through a type checker first. In the case of JSX and React, the transformed code is a series of React functions. Let’s look at a rudimentary example.

These two variable assignments are identical. Let’s step through the arguments passed to React.createElement to understand how a code compiler transforms JSX.

  • The first argument to React.createElement is the element name or reference. In this case, we’re using one of React’s built-in HTML elements, h1 , which is passed as a string literal.
  • The second argument is the properties or props argument. In the case of HTML elements, these are usually the attributes that are added, but props can be any value, as seen in our custom Props type definition earlier in the post.
  • The third argument represents the children of the element. In this case, it’s just a string that says "Hello, world" , but it could be more calls to React.createElement to create nested elements.

Let’s rewrite that function call and arguments as JSX with annotations once more:

The children property is special insofar as it can either be passed in between the opening and closing tags for a React element, or it can be passed just like other properties. In other words, the code above can be rewritten as:

Now that we understand a bit about JSX, let’s look at our component again:

The part of the code indicated by marker 6 is a JSX embedded expression . It’s just a JavaScript expression written inside a JSX call by surrounding it in curly braces. In this case, hasPadding && "padding" is a boolean expression that checks if hasPadding is true and returns “padding”. If hasPadding is false, the whole expression will return false .

There’s another embedded expression surrounding children . This just tells JavaScript/JSX to output the contents of children .

Note that JSX embedded expressions can only be expressions —statements that produce a value. For example, you can’t put an if...else statement inside a JSX embedded expression since if...else statements don’t have to return a value. You can, however, use ternary operators to check a condition:

If you’re unfamiliar with ternary operators, they work like this:

You can expect to see them with some regularity in React code, since they’re useful for conditionally rendering different results based on a component’s properties.

What a journey! I hope you learned something new and that you’re feeling proud to have made it through this post. It’s amazing how many ideas and tools are wrapped up in just 5 lines of code. There’s a lot of additional material around to learn about each of these ideas in more detail—here’s just a sampling:

  • Here’s a website covering all the new JavaScript features added in ES6
  • For a more comprehensive look at JavaScript’s native features, I refer to the MDN JavaScript Reference almost daily.
  • React’s own documentation is beautifully-written and has helpful guided tutorials
  • TypeScript has a 5-minute guide to set up and begin to explore its capabilities

assignment 1 react components

React Lesson 2: Homework Assignment

Ilia Dzhiubanskiy

Hopefully, all’s going well!

Let’s check our home task. The main reason of using React lies in the ability to create components based on your functionality set, i.e. to divide the whole app into small independent parts. In our case, we need to make comments our independent component. It will also be great to practice the skill of creating as many stateless components as possible. One of the examples in this scenario is the comment.js file.


Our file named Articles.js will change in the following way:

This is how our home task coding will look like. You can download the file with the updated project from our repository or just copy it. Our next assignments will continue in this file.

a mockup web page of our blog at blog.soshace.com

React lessons can be viewed here:  https://soshace.com/category/javascript/react/react-lessons/

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Using destructuring assignment in React

by Nathan Sebhastian

Posted on Nov 19, 2020

Reading time: 3 minutes

assignment 1 react components

Destructuring assignment is a feature of JavaScript introduced by ES6 (or ES 2015) that’s available for both object and array data types. It allows you to assign the values of an array or the properties of an object without needing to reference the variable directly in the assignment.

Here’s the traditional way of assigning a value to a variable in JavaScript:

With destructuring assignment, your code will look like this:

You just turned two lines of assignment into one. Awesome, right? The same is also possible with an array, but instead of using curly brackets( {} ) you need to use square brackets ( [] ) on the assignment:

In fact, the useState hook from React returns an array with two values that we destructure immediately. Here’s an illustration of how it works:

The benefits of using destructuring assignment is especially visible when using React because you would deal with state and props frequently. For example, a functional component may receive a single prop object with many properties like this:

When you need to display the props in your interface, you’d probably pass the prop into the component and use the value with props. syntax:

Yikes! Look at how long the syntax just for displaying a name. When using destructuring assignment, you can reduce that long syntax and make it better. First, destructure the userData props before passing it to the component:

Then pass it into the component as two props:

Or you can also use spread operator so you don’t need to destructure it:

Then immediately destructure the props object when you define the parameters in the function, like this:

And now you can use the arguments inside your props with less repetition:

Want even less repetition? You can even destructure nested properties with JavaScript!

Here’s a Code Sandbox example that you can tweak with.

The syntax looks a bit complicated at first, so here’s how to make destructuring easy in two steps process:

First, you need to find the name of the properties you want to extract first. In the example, the goal is to extract loggedIn , firstName , lastName , and email properties:

First and Second-level properties in JS object

After that, you simply find the first-level properties that hold the second-level properties. Write the property name:

Then write the desired properties inside the curly brackets:

The same could also be applied in class-based components. You simply destructure the props in your render() function:

And that’s it. Destructuring assignment is a wonderful feature from ES6 that really helps you to avoid repetition and keep your code clean. You can extract nested properties of an object and simply use them inside your render function.

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assignment 1 react components

10 React Code Snippets that Every Developer Needs

assignment 1 react components

Abara Vivian

10 React Code Snippets that Every Developer Needs

In React development, the principle of reusability holds significant importance. The ability to craft generic functions and components that can be reused not only streamlines code refactoring but also adheres to the fundamental principle “Don't Repeat Yourself” (DRY). This approach not only enhances React code efficiency and maintainability but also increases productivity by saving valuable time.

As developers, we frequently encounter components that warrant reuse across various projects. For instance, a generic button component with consistent properties might be needed in multiple pages or applications. While manually copying and pasting components across projects might seem like a quick fix, it can lead to unnecessary errors and inefficiency. This is where the practice of saving React code snippets proves invaluable. By storing these reusable code fragments, developers can expedite future development tasks.

However, there's a caveat to this approach. As the repository of saved snippets grows, it can become unwieldy, making it challenging to navigate and maintain. To address this issue, employing a dedicated code snippet management tool becomes imperative. Such tools facilitate organized storage and retrieval of snippets, thereby enhancing developer efficiency and project scalability. This article explores the importance of saving and managing code snippets using a snippet management tool and some essential code snippets that you can use in any React project.

What is React?

React is a front-end library that is based on JavaScript. It is maintained by teams at Meta, and commonly used to build user interfaces. ReactJS can be combined with other frameworks, like Next.js, to create mobile and server-rendered applications, among other uses. Check out the React docs to learn more.

Why You Need a Snippet Management Tool

A snippet management tool is a software application designed to help developers store, organize, manage, and retrieve their code snippets effectively. It serves as an indispensable asset for developers by facilitating version control and collaboration among team members. While this is not a replacement for documentation like the Reactjs docs, maintaining your own snippet repository is an excellent way to enhance your personal workflow. Here are some major reasons why every developer needs one:

  • Efficiency : With a snippet management tool, developers can quickly access and insert commonly used code snippets into their projects without the need to rewrite them from scratch. This saves significant time and effort during development, allowing developers to focus more on solving problems and building features rather than repetitive tasks.
  • Consistency : By storing and organizing code snippets in a central repository, developers can ensure consistency across projects. This means using the same reliable and tested code snippets repeatedly, reducing the risk of errors and inconsistencies in codebases. It also helps maintain uniform coding standards and practices across teams and projects.
  • Knowledge Sharing : Snippet management tools enable developers to share useful code snippets with their team members or the broader developer community. This fosters collaboration and knowledge sharing within teams and across organizations, as developers can benefit from each other's expertise and solutions to common coding challenges.
  • Learning and Growth : As developers accumulate and organize code in their snippet management tool, they also build a valuable resource for learning and personal growth. By reviewing and reusing snippets, developers can deepen their understanding of coding patterns, best practices, and advanced techniques. Over time, this continuous learning process enhances their skills and makes them more proficient developers.

Introducing Pieces

In this article, we will use Pieces to store the discussed React code. Pieces is not your ordinary snippet management tool; it's a powerhouse equipped with on-device AI that learns from your actions, automatically adding titles, descriptions, related links, and more. With a plethora of outstanding features, Pieces is a must-have tool for every developer. These features include:

1. Snippet Management : Effortlessly save and store various developer resources such as code snippets, scratch files, and screenshots.

2. AI-Enabled Features : Pieces includes an on-device copilot that assists in capturing, enriching, and reusing materials. It streamlines collaboration and solves complex problems through a contextual understanding of workflows.

3. Extensions and Plugins : Compatible with VS Code, GitHub, web browsers, Microsoft Teams, and more, allowing for enhanced developer materials across workflows and improved AI capabilities.

4. Personal Copilot : Pieces' copilot and code capture feature enable saving, sharing, generating, and understanding code snippets and concepts. This boosts productivity during online research and problem-solving endeavors.

Pieces revolutionizes the way developers manage and utilize their resources.

10 Essential React Code Snippets

As a React developer, there are components or code snippets that you may need to reuse multiple times. Let’s take a look at some React example code as you’re getting started with React. Here are some of the major, most-used React code components:

1. Functional Component with Props

  • Description : A fundamental building block in React apps that creates reusable UI components.
  • Use case : Displaying a message passed as a prop.
  • Code snippet :

Save this code

2. List Rendering

  • Description: Renders items in a list, mostly from an API or database, to be displayed on the user interface.
  • Use case : Displaying a list of items.
  • Description : React code that handles forms and input submission.
  • Use case : Creating a form for user input.

4. Custom Hooks

  • Description : Creates a hook for reusing stateful logic.
  • Use case: Fetching data from an API with reusable logic.

5. Modal Component

  • Description: A component for displaying overlay modals.
  • Use case: Displaying a notification modal.
  • Code Snippet:

6. Tabs Component

  • Description : A tab component for switching between different content.
  • Use Case : Implementing tabbed navigation for different sections of a page
  • Code Snippet :

7. Image Slider Component

  • Description : An image slider for displaying multiple images.
  • Use case : Image carousel

8. Button Component

  • Description : Reusable button component in React code.
  • Use case : A UI button component that accepts different props.

9. Loading Spinner Component

  • Description: A reusable loading spinner to simulate a loading effect.
  • Use case : Show loading spinner when data from an API is yet to arrive.

10. Dropdown Component

  • Description : A component for selecting options.
  • Use case : Select options based on a filter or category.
  • Code snippet:

In this article, we've covered some handy React code snippets that can save you time and effort in your projects. But why stop there? Create and save your favorite snippets to avoid reinventing the wheel and keep your solutions organized. Ready to boost your productivity? Download the Pieces desktop app to start building your personal snippet library. And don't forget to check out our blog for more developer-related insights.

Let’s code smarter, not harder. Happy coding!

Table of Contents

Introducing Pieces Copilot+, now with Live Context

Now available in public alpha, Pieces Copilot+ with Live Context understands your workflow and allows you to chat about how, where, and when you work.

Multimodal AI: Bridging the Gap Between Human and Machine Understanding

Discover how multimodal AI is blending sight, sound, and text to revolutionize the way machines understand and interact with the world around us.

How to Build in Public as a Tech Professional

This article will give you tips on how to effectively build in public as a tech professional, especially software developers.

assignment 1 react components

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Celtics React to Jaylen Brown's Game 1 Heroics: 'It's Going Up and It's Going In'

Eric jay santos | 18 hours ago.

May 21, 2024; Boston, Massachusetts, USA; Boston Celtics guard Jaylen Brown (7) reacts after his three point basket sending the game into overtime against the Indiana Pacers in the fourth quarter during game one of the eastern conference finals for the 2024 NBA playoffs at TD Garden. Mandatory Credit: David Butler II-USA TODAY Sports

  • Boston Celtics

On Tuesday, the Boston Celtics picked up a 133-128 overtime win over the Indiana Pacers in Game 1 of the Eastern Conference Finals. 

Jaylen Brown proved to be the hero of the match. With 5.7 seconds remaining in regulation, the three-time All-Star saved the game for the Celtics.

JB WITH THE CORNER 3 TO TIE IT 🤯 🤯 🤯 pic.twitter.com/f2GcbZ955z — Celtics on NBC Sports Boston (@NBCSCeltics) May 22, 2024

“I was just talking to myself, 'if I get this shot, it's going in,'" said Brown, unfazed by faring 0/3 from beyond the arc before burying that corner three to force overtime. 

"I was telling myself the whole time, 'if you get it, it's going up, and it's going in.' I can create some space on their backside and was able to make a big-time play."

Teammate Jrue Holiday inbounded to Brown for the crucial shot. Per Inside The Celtics, Holiday expressed of the sequence: “Saw Jaylen wide open. Sometimes, plays like that, it’s kind of hard to see both sides, but saw one side, looked at the other side, and Jaylen was wide open. It was a great shot, he pretty much did everything.”

Celtics head coach Joe Mazzulla praised both Brown and Derrick White for their execution during the play. 

“Yeah, it was a great, well-executed play by the guys. You just create, kind of, indecision. We were able to maintain it. And I thought D-White set a great screen, I thought Jaylen had a great foul. Great pass, great shot. So, just a well-executed play by the guys. Good situational awareness, situational execution.” 

While Brown helped stake the Celtics to a 1-0 lead in the Eastern Conference Finals, the challenge now becomes trying to win Game 2 for the first time this postseason and take a 2-0 advantage to Indiana.

"We got to be able to channel our emotions and move on to the next and get ready for Game 2," stated Brown of Boston's next test, which will tip off on Thursday night at 8:00 EST at TD Garden.

Further Reading

Jaylen Brown's Heroics Propel Celtics to 1-0 Lead in Conference Finals

Aaron Nesmith Left Lasting Impression with Celtics Before Finding a Home with Pacers

Trivializing Celtics' Success in Tatum-Brown Era a Take Not Measured Properly: 'Doing

Past Hardships Brought Out Best in Al Horford in Career Night: 'You Saw His Gift'

Jayson Tatum, Jaylen Brown Still Shaking Off Criticism While Growing as Leaders

Jrue Holiday Delivers 'Masterclass' in Game 3 Win vs. Cavs

Jayson Tatum Breaks Out of Scoring Slump That Never Defined Him: 'Underappreciated'

Derrick White Discusses Joining Elite Company in Game 1 Win vs. Cavaliers

Kristaps Porzingis Discusses Target Date to Rejoin Celtics' Playoff Run: 'Doing Everything I Can'

Eric Jay Santos



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Mastering React Input Readonly Attributes: Best Practices

Authore Name

Rakesh Purohit

Detail Image

The readonly attribute in HTML is a powerful tool for web developers, particularly when it comes to creating forms. In React, this attribute plays a crucial role in managing the state of input elements within a form. By setting the readonly attribute on an input field, developers can prevent users from modifying the value of the field while still allowing them to interact with it, such as selecting and copying the text.

React input readonly attribute is particularly useful in scenarios where the input value should be visible to the user but not editable, such as displaying a calculated value or a fixed data string. It's important to note that a readonly input field is still included in form submissions, unlike a disabled field, which is not.

Here's a simple example of how to implement a readonly input in a React component:

In this example, the input field is set to a readonly state by passing the readOnly prop, which corresponds to the HTML readonly attribute. This ensures that the value displayed cannot be altered by the user.

Code Example: Readonly Input in React

Let’s dive deeper into the code and create a controlled component in React that uses the readonly attribute. Managing input state in controlled components can be challenging, especially when using the readonly attribute, as it requires careful handling of state variables to control input values. Here’s how you can create a controlled component with a readonly input:

In this ReadOnlyInputComponent, the useState hook initializes the inputValue state with a default string. The input element is then bound to this state via the value prop, and the readOnly prop ensures that the input remains uneditable.

Locking Down Input Fields in React

How do you lock an input field in react.

Locking an input field in React to prevent user edits can be achieved by using the readonly attribute. This attribute ensures that the input's value remains unchanged by the user, while still allowing text selection and focus. It is important to differentiate between the readonly and disabled attributes. A readonly input field is still focusable and its value is submitted with the form, whereas a disabled input field is not focusable and its value is not submitted.

The Difference Between Readonly and Disabled Attributes

The readonly attribute and the disabled attribute both prevent the user from changing the input value, but they have different implications for form submission and user interaction. A readonly input field is still included in the form submission, while a disabled input field is not. Additionally, a readonly field can still be focused and the text can be selected, which is not possible with a disabled field.

Here's an example that illustrates the difference:

In this InputComparison component, the first input is readonly and the second one is disabled. The user can select and copy the text from the readonly input but cannot interact with the disabled input at all.

Troubleshooting Common Readonly Issues

Why my input field is not editable in react.

If you find that your input field is not editable in React, it could be due to the readonly attribute being set, either directly or through the state of the component. To resolve this, ensure that the readOnly prop is not set on the input element if you want the field to be editable. Additionally, make sure that the input name attribute is correctly assigned, as it can influence how the input field is managed and updated within the form. If the input is part of a controlled component, check that the state variable and event handler managing the input’s value are correctly implemented.

Ensuring Proper Readonly Implementation

To ensure that the readonly attribute is properly implemented in your React components, always use the readOnly prop in your input elements. This will clearly indicate that the input is meant to be read-only. Additionally, make sure that the state and props of your component are not inadvertently making the input read-only. For example, if you are passing a value prop to the input but not providing an onChange event handler, the input will be read-only because React enforces that inputs with a value prop must also have an onChange handler to be editable.

In the FormComponent, the EditableInput is a controlled component that receives the inputValue and handleInputChange function as props. The onChange event handler updates the state, thus allowing the input to be editable.

Working with Controlled Components

What is readonly in react.

In React, readOnly is a boolean attribute that, when set to true, makes an input element unchangeable by the user. This is useful for displaying values that should not be modified, such as a user ID or a calculated total. It’s important to distinguish between readOnly and controlled components. While readOnly refers to the attribute that prevents user modifications, controlled components are those where the form data is handled by the state of the component. Managing input state in controlled components is crucial as it involves using state variables to control input values, ensuring that the component's state reflects the current input value accurately.

Should React Props Be Readonly?

React props should be treated as read-only because they are meant to be immutable and managed by the parent component. This is a fundamental concept in React's unidirectional data flow. When you need to change the value in response to user input, you should use state rather than props. This ensures that the component remains predictable and easier to debug.

Managing Form Submissions with Readonly Inputs

How to handle form submission with readonly fields.

When dealing with form submissions in React, it's important to understand how readonly inputs behave. Readonly inputs are included in form submissions, but their values cannot be changed by the user. This can be useful for submitting hidden or calculated values that should not be altered.

Here's an example of handling form submission with a readonly input:

In the ReadOnlyForm component, the form submission is handled by the handleSubmit function, which prevents the default form submission behavior and uses FormData to retrieve the value of the readonly input.

Styling Readonly Inputs in React

How to make input readonly in css.

While the readonly attribute is set within the JSX of a React component, you can also style readonly inputs using CSS to make them visually distinct. This can be done by targeting the :read-only pseudo-class in your stylesheet.

You can apply this CSS to your React component by including the stylesheet in your project or using inline styles.

Customizing the Appearance of Readonly Inputs

To further customize the appearance of readonly inputs in your React components, you can use conditional rendering to apply different classes or styles based on whether the input is readonly.

In this CustomReadOnlyInput component, the inputClass is determined based on the isReadOnly prop, allowing you to apply different styles for readonly and editable states.

Advanced Readonly Techniques

Creating custom input components with readonly support.

Developing custom input components in React that support the readonly attribute can enhance the reusability and consistency of your forms. Here's an example of a custom input component that accepts a readonly prop:

In the UserProfile component, the CustomInput is used to display a user ID as a read-only field. This approach ensures that the readonly state of the input is controlled by the prop passed to the CustomInput, making it a versatile component for different scenarios.

Implementing Readonly Logic with React Hooks

React hooks provide a modern way to handle state and side effects in functional components. To implement readonly logic, you can use the useState and useEffect hooks to control when an input should be readonly based on certain conditions.

In this ConditionalReadOnlyInput component, the useState hook initializes the isReadOnly state, and the useEffect hook contains the logic to update this state based on certain conditions, such as the user's role.

By integrating the readonly attribute into your React components with these techniques, you can create robust, user-friendly forms that cater to a variety of use cases. Whether you're displaying calculated values, user IDs, or other non-editable data, the React input readonly attribute is an essential tool in your React toolkit.

Remember to test your forms thoroughly to ensure that the readonly fields behave as expected and that the form submission includes the correct values from these fields. With careful implementation and styling, readonly inputs can significantly enhance the user experience of your applications.

This brings us to the end of the read-only attribute in React.

Mastering these attributes in React unlocks dynamic app possibilities, but building impactful apps requires more experience.

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Assignment for the "React - The Complete Guide" course.


Folders and files, repository files navigation, first assignment for the "react - the complete guide" course.

In this assignment We explore both the basics of component creation, the state and props, as well as event handling.

So what does this do?

This application presents to the user a series of card like "UserOutputs" with a salutation to the given username (props.username).

It also gives the user a "UserInput", the user input allows the user to change the name being displayed in the first card.

How can I see this in action?

Just run "npm start" from the project's root folder. A browser window with the application should pop up shortly after.

What was the assignment anyway?

The assignment was defined by our instructor as follows:

  • Create TWO new components: UserInput and UserOutput
  • UserInput should hold an input element, UserOutput two paragraphs
  • Output multiple UserOutput components in the App component (any paragraph texts of your choice)
  • Pass a username (of your choice) to UserOutput via props and display it there
  • Add state to the App component (=> the username) and pass the username to the UserOutput component
  • Add a method to manipulate the state (=> an event-handler method)
  • Pass the event-handler method reference to the UserInput component and bind it to the input-change event
  • Ensure that the new input entered by the user overwrites the old username passed to UserOutput
  • Add two-way-binding to your input (in UserInput) to also display the starting username
  • Add styling of your choice to your components/ elements in the components - both with inline styles and stylesheets
  • JavaScript 75.0%
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  • How to Add Form Validation In Next.js ?
  • How to Implement Form Validation in React Native ?
  • How to implement validation in Express JS?
  • ReactJS Form Validation using Formik and Yup
  • How to handle data validation with React Hooks ?
  • How to perform form validation in React?
  • How to perform form validation for a required field in HTML ?
  • How to prevent form submission when input validation fails in AngularJS ?
  • How to validate an email in ReactJS ?
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  • How to Generate and Validate OTPs in Node.js with 'Speakeasy' Module ?
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  • Explain the use of the yup library for form validation.
  • How to apply validation on Props in ReactJS ?
  • How to add validation to ngbDropdownMenu in Angular ?
  • How to Validate Form Data in PHP?

How To Implement NextJS Form Validation With Formik And Zod ?

Form validation is a critical aspect of web development to ensure that user input meets specific criteria before submitting data to the server. Implementing form validation in Next.js can be simplified using Formik, a form library for React, and Zod, a schema validation library. Together, they provide a robust solution for managing form state and validating input data in Next.js applications.


  • NPM & NodeJS
  • HTML , CSS , and JavaScript

Approach to Implement NextJS Form Validation with Formik and Zod

  • Define the layout and structure of the login form using React components and Formik library.
  • Specify validation rules for form fields using Zod schema. This includes requirements for the name, email, and message fields.
  • Display form fields and error messages dynamically.
  • Connect validation schema with Formik.
  • When the button is clicked, Formik invokes the onSubmit function, triggering the defined actions such as displaying an alert.

Step 1: Create a NextJS application

Step 2: Navigate to the Project directory

Step 3: Install necessary dependencies and bootstrap for CSS styling.

Project Structure:


Project Structure

The Updated dependencies in your package.json file is look like :

Step 4: Create a folder as components and make a components as LoginForm.tsx

Start your application using the following command:

NextJS form validation using formik

Validation using formik and zod

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Endurance Grand Returns From 1st International Assignment, Biskit Gifts Her Flowers: "Mentor Vibes"

  • A video of young, talented Ghanaian dancer Biskit, welcoming her mentor, Endurance Grand, at the Kotoka International Airport has sparked emotions
  • The duo were delighted to see each other after the latter returned from her special assignment abroad
  • Netizens who saw the video were touched by the scene and took to the comment section to share their views

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Ghanaian dancer Endurance Grand received a rousing welcome from her mentee, Biskit, when she returned from her special trip abroad.

Biskit was among a team at the airport to welcome Endurance back after her first international assignment.

Endurance Grand returns from 1st International assignment, Biskit gifts her flowers

Filled with nostalgia and overjoyed, the talented young Ghanaian dancer ran into the embrace of her mentor upon seeing her and handed her a bouquet.

Endurance Grand , who was equally delighted to see her protégé, held on tightly to her and later carried her.

assignment 1 react components

Ayra Starr thrills fans with exciting performance in Brazil, fans react: "She don big pass Tems"

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Netizens react to the video

Netizens who saw the video were touched the scene and took to the comment section to express their views.

@ ROZITA wrote:

"Mummy Biskit is back."

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"Who’s cutting onions?"

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"Endurance is like biskit dont cry."

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"Who is cutting onions."

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"This is beautiful, was like mummy I won."

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  1. What Is Components In React Js

    assignment 1 react components

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  3. React Styled Components

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  5. REACT JS LIFECYCLE. Four phases of a React component

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  5. React and node JS project #19 Add Product Component UI

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  1. OlhaHolovina/react-components-assignment-1

    It correctly bundles React in production mode and optimizes the build for the best performance. The build is minified and the filenames include the hashes. Your app is ready to be deployed!

  2. Your First Component

    Step 1: Export the component. The export default prefix is a standard JavaScript syntax (not specific to React). It lets you mark the main function in a file so that you can later import it from other files. (More on importing in Importing and Exporting Components !)

  3. GitHub

    All components you implement should go in the src/components directory. Don't change the component folder names as those are the files being imported into the tests. Do not remove the pre-filled code; Want to quickly review some of the concepts you've been learning? Take a look at the Cheat Sheets.

  4. njbbaer/udemy-react-assignment-1

    Assignment 1. React The Complete Guide. Solution by Nate Baer. Requirements. Create TWO new components: UserInput and UserOutput; UserInput should hold an input element, UserOutput two paragraphs; Output multiple UserOutput components in the App component (any paragraph texts of your choice)

  5. Learn React Basics in 10 Minutes

    Learn React Basics in 10 Minutes. Joe Liang. If you want to learn the basics of React in the time it takes you to drink a cup of coffee, this post is for you. This article aims to provide a beginner-friendly introduction to React, what it is, and why we need it. It assumes you have some understanding of basic JavaScript.

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    Simple question: I have read a couple of answers such as this on the differences between Object.assign and the assignment operator (i.e. =) and understand all the points brought up such as that the first copies the object while the latter simply assigns the address.. I want to make a decision on which one to use and would like to know what the implications are for React components as I have ...

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    Try replacing the <Avatar> inside <Card> with some text to see how the Card component can wrap any nested content. It doesn't need to "know" what's being rendered inside of it. You will see this flexible pattern in many places. You can think of a component with a children prop as having a "hole" that can be "filled in" by its parent components with arbitrary JSX.

  8. Sharing State Between Components

    Step 1: Remove state from the child components. You will give control of the Panel 's isActive to its parent component. This means that the parent component will pass isActive to Panel as a prop instead. Start by removing this line from the Panel component: And instead, add isActive to the Panel 's list of props:

  9. Describing the UI

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  12. Anatomy of a Typed React Component

    These two variable assignments are identical. Let's step through the arguments passed to React.createElement to understand how a code compiler transforms JSX. The first argument to React.createElement is the element name or reference. In this case, we're using one of React's built-in HTML elements, h1, which is passed as a string literal.

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    React Lesson 2: Homework Assignment. Hopefully, all's going well! Let's check our home task. The main reason of using React lies in the ability to create components based on your functionality set, i.e. to divide the whole app into small independent parts. In our case, we need to make comments our independent component.

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