Introduction to JavaScript ES6 (ECMAScript 2015)

In this JavaScript article we want to talk about Introduction to JavaScript ES6 (ECMAScript 2015), JavaScript is popular programming language that is widely used for developing web applications. ECMAScript (ES) is the official specification of the JavaScript language. ECMAScript 2015 (ES6) is major update to the JavaScript language specification that introduced many new features and syntax enhancements to the language. in this article we want to provide an introduction to some of the new features introduced in ES6.

Introduction to JavaScript ES6 (ECMAScript 2015)

Now let’s talk about some of these features

let and const Declarations

ES6 introduced two new ways to declare variables, let and const. let keyword is used to declare variables that have block scope and const keyword is used to declare constants that cannot be reassigned.

let x = 10;
const PI = 3.14;

1 2	let x = 10; const PI = 3.14;

Arrow Functions

ES6 introduced arrow functions which provide nice syntax for defining functions. Arrow functions uses the => syntax and do not have their own this or arguments objects.

// Regular function
function add(x, y) {
  return x + y;
}

// Arrow function
const add = (x, y) => x + y;

// Regular function

function add(x, y) {

return x + y;

}

// Arrow function

const add = (x, y) => x + y;

Template Literals

ES6 introduced template literals that provides more convenient way to concatenate strings and variables. Template literals use the backtick character () and allow you to embed expressions within a string using ${}.

const name = 'John';
const age = 30;
const message = `My name is ${name} and I'm ${age} years old.`;

const name = 'John';

const age = 30;

const message = `My name is ${name} and I'm ${age} years old.`;

Destructuring Assignment

ES6 introduced destructuring assignment which allows you to extract values from arrays and objects and assign them to variables.

const arr = [1, 2, 3];
const [a, b, c] = arr;

const obj = { x: 1, y: 2, z: 3 };
const { x, y, z } = obj;

const arr = [1, 2, 3];

const [a, b, c] = arr;

const obj = { x: 1, y: 2, z: 3 };

const { x, y, z } = obj;

Spread Operator

ES6 introduced spread operator (…) that allows you to spread the contents of an array or object into new array or object.

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];
const arr3 = [...arr1, ...arr2];

const obj1 = { x: 1, y: 2 };
const obj2 = { z: 3 };
const obj3 = { ...obj1, ...obj2 };

const arr1 = [1, 2, 3];

const arr2 = [4, 5, 6];

const arr3 = [...arr1, ...arr2];

const obj1 = { x: 1, y: 2 };

const obj2 = { z: 3 };

const obj3 = { ...obj1, ...obj2 };

Classes

ES6 introduced class syntax that provides more object oriented approach to programming in JavaScript. Classes in JavaScript are just syntactic sugar for the prototypal inheritance pattern used in previous versions of the language.

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }

  sayHello() {
    console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);
  }
}

const john = new Person('John', 30);
john.sayHello();

class Person {

constructor(name, age) {

this.name = name;

this.age = age;

}

sayHello() {

console.log(`Hello, my name is ${this.name} and I'm ${this.age} years old.`);

}

const john = new Person('John', 30);

john.sayHello();

At the end we can say that ES6 introduced many new features and syntax enhancements to the JavaScript language and this makes it more powerful and flexible than ever before. the features we covered in this article are just small sample of what ES6 has to offer. by taking advantage of these new features you can write more readable and expressive code and improve your productivity as JavaScript developer.

Introduction to JavaScript ES6 (ECMAScript 2015)

Introduction to JavaScript ES6 (ECMAScript 2015)

let and const Declarations

Arrow Functions

Template Literals

Destructuring Assignment

Spread Operator

Classes

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