Since ES2015 and the subsequent versions of ECMAScript standards were introduced, many new functionalities that were not available in JavaScript before have been provided. Even if you have previous experience in JS, lacking a proper understanding of ES6 features can cause difficulties, particularly when working with React. In this article, we will explore the most notable ES6 features that are commonly used in React.
To understand ES6 we must have a fair understanding of React Js.
React is a JavaScript library that enables developers to create dynamic and responsive user interfaces (UIs) for web applications. React was first developed by Facebook in 2011 as a solution to improve the performance and maintainability of their UIs. Since then, React has become one of the most popular JavaScript libraries and is widely used by developers all over the world.
React.js is a popular JavaScript library for building dynamic and interactive user interfaces because it supports some attributes as below:
JavaScript has come a long way since its introduction in the 1990s. It has evolved from a simple scripting language to a powerful tool for building web applications. One of the most significant updates to JavaScript in recent years is ECMAScript 6, commonly known as ES6.
ES6 was released in 2015 and is the latest version of the ECMAScript standard. It is a major update to the language and brings many new features and improvements to JavaScript. In this article, we will take a closer look at some of the most popular and useful features of ES6.
In ES6, two new keywords were introduced for variable declaration: let and const. The let keyword allows you to declare variables that are block-scoped, meaning they are only accessible within the block they are defined in. On the other hand, const allows you to declare constants, which are variables that cannot be reassigned.
=>
let companyStrength=”126″ // it is mutable
const companyname=”singsys” // it is unmutable/ non-changable value
Arrow functions are a new syntax for writing functions in JavaScript. They provide a more concise syntax for writing functions and also have lexical this binding, which means that the value of this is determined by the surrounding code, rather than the function itself.
=>
const playGame = player => {
if(player != “” && player != undefined) {
console.log(`${player}! Welcome in game`);
} else {
console.log(“Invalid player”);
}
}
Template literals provide a new way to create strings in JavaScript. They allow you to embed expressions inside a string, making it easier to create dynamic strings.
=> `Rohan have ${mark} in math.`
Destructuring Assignment
=>
let a, b, rest;
[a, b] = [10, 20];
console.log(a);
// Expected output: 10
console.log(b);
// Expected output: 20
[a, b, …rest] = [10, 20, 30, 40, 50];
console.log(rest);
// Expected output: Array [30, 40, 50
Classes provide a more structured way of creating objects in JavaScript. They are similar to classes in other object-oriented programming languages and provide a way to create reusable object templates.
=>
//Declaring class
class Employee {
//Initializing an object
constructor(id,name) {
this.id=id;
this.name=name;
}
//Declaring method
detail() {
console.log(this.id, this.name)
}
}
Modules provide a way to organize code into separate files, making it easier to manage large codebases. ES6 modules use a new syntax for exporting and importing code, making it easier to share code between files.
=>
<script type=”module”>
import users from “./users.js”;
</script>
Promises provide a way to handle asynchronous code in a cleaner and more organized way. They allow you to write asynchronous code that looks synchronous, making it easier to reason about and debug.
=>
new Promise((resolveOuter) => {
resolveOuter(
new Promise((resolveInner) => {
setTimeout(resolveInner, 1000);
}),
);
});
Destructuring provides a way to extract values from objects and arrays in a more concise way. It allows you to assign variables from the properties of an object or elements of an array.
=>
let a, b, rest;
[a, b] = [10, 20];
console.log(a);
// Expected output: 10
console.log(b);
// Expected output: 20
[a, b, …rest] = [10, 20, 30, 40, 50];
console.log(rest);
// Expected output: Array [30, 40, 50]
ES6 is a major update to the JavaScript language that brings many new features and improvements to the language. These features make JavaScript programming easier, more organized, and more fun. As a web developer, it is important to stay up to date with the latest features and updates to the language to ensure that you are writing the best code possible.
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