Top JavaScript ES6 Features Every Developer Must Know

JavaScript

JavaScript which has JS condensation, it’s an programming language. It’s one of the core languages in the world along side HTML and CSS. Till now, 98% of world’s websites uses JS. It’s mainly used on client side for the behaviour of web runner. It’s easy to learn and use. It’s used to produce interactive and dynamic content on web.

Let’s discuss numerous of JS features that every innovator should know. Every JavaScript innovator should be alive of these features because they are necessary. Indeed in the interviews, modern JavaScript has a vital part. So in this composition, we will list the top 10 JavaScript features that you should be alive of.

What is ES6?

ES6 is the 6th edition also an major edition of the ECMAScript language specification standard. It defines the standard for the performance of JavaScript and it has come much more popular than the former edition ES5.

ES6 has significant changes to the existing JavaScript language. It brought several new features like, let and const keyword, rest and spread motorists, template literals, classes, modules and multitudinous other advancements to make JavaScript programming easier and farther fun. Let’s check scatter of them.

Let and Const Keywords

Ahead, JavaScript only handed the var keyword for declaring variables. But there are some problems with var. First, its compass, which can be global or functional.

Alternate, variables declared with var can be re-declared. also, there can be problems with the fact that var variables can be streamlined.

So, JavaScript handed two new keywords to fight the unwanted situations let and const.

Variables declared with let and const have block rung. also, the variables declared with a let can’t be re-declared, while the variables declared with const can neither be re-declared nor be streamlined.

String Interpolation

Strings are one of the most considerably used data types in the programming world. They are excessively used in JavaScript development. Working with strings can be complicated sometimes. For illustration, see the following code:

let firstname = "John";

let lastname = "Smith";

let age = 27;

let location = "Texas";

return firstname + " " + lastname + " is " + age + " yrs old and lives in " + city;

There is no problem with the string in the return statement, but don’t you suppose it’s kindly complex? String interpolation makes analogous situations fairly simple..

return `${firstname} ${lastname} is ${age} yrs old and lives in ${city}`;

With string interpolation, we do not need to use the concatenation motorist. We can easily write the required variables in the string itself. It’s also one of the popular JavaScript interview questions preparing these generalities is truly important for Java formulators.

Spread Operator

The spread motorist is used to discharge an array or object in JavaScript. basically, it unpacks the rudiments of an array or object separated by commas. Observe the ensuing law.

let arr1 = [1, 2, 3];

let arr2 = [4, 5, 6];

let arr3 = [ ...arr1, ...arr2 ]

console.log(“output:”+arr3) //output: [1, 2, 3, 4, 5, 6]

In the shown code, arr3, was created using arr1 and arr2. The spread motorist, denotedby., is used to discharge the arr1 and arr2. Now, this can be done without a spread motorist, but it would be a tough job. So spread motorist is truly useful in analogous situations. also, the spread motorist can also be also used on objects.

Arrow functions

JavaScript formulators were demanding the arrow function for a long time. Arrow function is a simple generality that lets us shortly write functions. Observe the ensuing code.

function demo(a, b) {

    return a + b;

}

The demo is a JavaScript formulators were demanding the arrow function for a long time. Arrow function is a simple generality that lets us shortly write functions. Observe the ensuing code.

const demo = (a,b) => a + b;

The above code is volition to the earlier rally function. However, we can forget the” return keyword, If the function body has a single statement.” with arrow functions. We can also skip the gap in the case when there is exactly one parameter but will always need to use it when you have zero or further than one parameter.

This is also basics for functional programming in JS such as lambda in Java.

Destructuring

Array and object destructuring is another important point of modern JavaScript. It’s used to prize the parcels of an object or particulars from an array. Observe the ensuing code.

  const obj = { name: "John", age: 27, city: "Texas" }  const { name, age, city } = obj;

In the above code, the parcels of” obj” are pulled using object destructuring. So, you can see object destructuring is done using coiled classes. also, the particulars of an array can be pulled using the array destructuring. Array destructuring is done using square classes.

Enhanced Object Literals

ES6 provides enhanced object literals which make it easy to snappily produce objects with parcels inside the curly braces.

function getMobile(manufacturer, model, year) {

   return {

      manufacturer,

      model,

      year

   }

}

getMobile("Samsung", "Galaxy", "2020");

Modules

Before ES6, there were no native support for modules in JS. ES6 introduced a new point called modules, in which each module is represented by a separate”. js” train. We can use the” import” or” import” statement in a module to import or import variables, functions, classes, or any other element from/ to different lines and modules.

export var num = 50; 

export function getName(fullName) {   

   //data

};

import {num, getName} from 'module';

console.log(num); // 50

Other Features

Apart from these features, you should also learn features analogous as:

• async/await
• promises
• rest operator
• new array methods
• shorthand properties

Many of these features are simple to understand, but they are salutary while coding.

Summary

In this blog, we learned about the ECMAScript 2015 or ES6, which defines the standard for JavaScript programming. These are few of the best JavaScript Features you can learn. Modern JS has plenty of useful and powerful features. In this blog, we discussed some of the most powerful features of modern JavaScript.