React ES6

What is ES6?

React itself is not a programming language but a JavaScript library used for building user interfaces. However, React code is typically written using ECMAScript 6 (ES6) or later, which is a standardized version of JavaScript. ES6 introduces several features that enhance the readability and functionality of JavaScript code.

Here are some common ES6 features used in React development:

1.Arrow Functions:

Arrow functions provide a more concise syntax for defining functions. They also automatically bind to the enclosing scope, which is useful for defining functions in React components.


                  // ES5

function myFunction() {

  // function body

}



// ES6

const myFunction = () => {

  // function body

};

2.Classes:

ES6 introduced a more convenient syntax for defining classes. React components are often written as classes that extend from React.Component.


                  // ES5

var MyClass = React.createClass({

  render: function() {

    return <div>Hello, World! </div>;

  }

});



// ES6

class MyClass extends React.Component {

  render() {

    return  <div>Hello, World! </div>;

  }

}

3.Destructuring Assignment:

Destructuring assignment allows you to extract values from objects and arrays and assign them to variables.


                  // ES5

var obj = { x: 1, y: 2 };

var x = obj.x;

var y = obj.y;



// ES6

const { x, y } = { x: 1, y: 2 };

4.Template Literals:

Template literals provide a more flexible and readable way to concatenate strings.


                  // ES5

var name = "John";

var greeting = "Hello, " + name + "!";



// ES6

const name = "John";

const greeting = `Hello, ${name}!`;

5.Spread Operator:

The spread operator (...) can be used to spread the elements of an array or the properties of an object.


                  // ES5

var arr1 = [1, 2, 3];

var arr2 = arr1.concat([4, 5, 6]);



// ES6

const arr1 = [1, 2, 3];

const arr2 = [...arr1, 4, 5, 6];

6.Import and Export:

ES6 modules provide a standardized way to organize and import/export code.


                  // Importing in ES6

import React from 'react';

import MyComponent from './MyComponent';



// Exporting in ES6

export default class MyComponent extends React.Component {

  // component code

}