How to make boxes using map and useState in reactjs

 

 

 

 ES6 Gives us a new syntax for defining functions using a fat arrwo. Arrow fucntions bring a lot of clarity & code reduction.

ES6 is different version of the ECMAScript specification. Which is the standard that defines the scripting language that javascript is based on.

ES6 release on 2015 and there are so many features Arrow function, classes, let and const for variables.

 

React

Certainly, reactjs is a JavaScript library developed by Facenook for building user interfaces. It allows developers to create reusable UI components and effciently manage the state of their applications. Here are some key aspects of Reactjs.


Component-Based Architecture: ReactJS follows a component-based architecture, where the user interface is divided into small, reusable components. Components encapsulate their own logic, state, and rendering, making it easier to build and maintain complex user interfaces.


Virtual DOM: ReactJS uses a virtual representation of the DOM (Document Object Model), known as the Virtual DOM. When the state of a component changes, React updates the Virtual DOM.


JSX: JSX is a syntax extension for JavaScript used in React. It allows developers to write HTML-like code within JavaScript, making it easier to describe the structure and appearance of components. JSX code is transpiled to regular JavaScript using tools like Babel before being executed in the browser.



Hooks: React introduced Hooks in version 16.8 as a way to use state and other React features in functional components. Hooks allow developers to write reusable logic and manage state within functional components without the need for class components. The most commonly used hooks are useState for managing state and useEffect for handling side effects such as fetching data or subscribing to events.


React Router: React Router is a popular routing library for React applications. It enables developers to create single-page applications with multiple views and handles routing between different components based on the URL.


State Management: React provides a flexible ecosystem of state management solutions. While React's built-in state management (useState ) is suitable for managing local component state, more complex applications may benefit from additional state management libraries like Redux. These libraries help manage global application state and provide predictable ways to update and access the state.



ReactJS has gained widespread popularity due to its performance, reusability, and declarative approach to building user interfaces. It has large community.

 

How to make boxes using map and useState in reactjs

 

This is a React functional component named MapWithBoxes that renders a list of boxes using the map method and a Box component. Let's break down the code and explain each part:


1. Import Statements:

 

import React, { useState } from "react";

 

 

 
The code imports the React library and the useState hook from React. useState is used to manage state within functional components.

 

2. MapWithBoxes Component:

 

function MapWithBoxes() {

 

 
This defines a functional component named MapWithBoxes.

 
3. State Management:

 

const [movies, setMovies] = useState([1, 2, 3, 4, 5]);

 

 
This line initializes a piece of state named movies using the useState hook. The initial state is an array [1, 2, 3, 4, 5], which represents a list of movies (though the actual content is not used in this example).

 

4. Mapping Over Movies:

 

const boxes = movies.map(() => {
  return <Box />
});

 

This code uses the map function to iterate over the movies array. For each item in the array, it creates a Box component. The key prop is set to the index to help React efficiently update and render these components.


5. JSX Rendering:

 

return (
  <div/>
    <div className="max-w-[1240px] shadow-2xl min-h-[400px] mx-auto p-3 "/>
      {/* Input Element */}
    <input
        type="search"
        className="w-full border border-black rounded text-slate-500 p-4"
      />

      {/* Grid of Boxes */}
      <div className="w-full grid grid-cols-4 gap-5">{boxes}</div/>
    </div/>
  </div/>
);

 

Inside the return statement, there is JSX code that defines the component's layout.

It includes an input element for searching (though it doesn't have any functionality in this example).

The boxes array of Box components is rendered within a grid layout using the CSS classes provided.



6. Box Component:
 

 

const Box = () => {
  return <div className="shadow min-h-[200px] border border-black mt-3"/></div/>;
};

 

 

This defines a separate functional component named Box.

The Box component renders a <div> element with some CSS classes to create a box-like appearance with shadows and borders.

Output

In summary, this React component MapWithBoxes renders a list of boxes using the map function to iterate over an array of movie items. Each box is created using the Box component, and the resulting boxes are displayed within a grid layout. This code example is a simplified template and doesn't include any actual movie data or search functionality.

 

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