Concatenate Arrays In JavaScript - ES5 Vs ES6 | Docs @ SodhanaLibrary

Concatenate Arrays In JavaScript - ES5 Vs ES6

Wednesday 8 June 2016 | Posted by Sample

ES5 provides concat() Array method to concatenate arrays. ES6 spread operator converts contents of operand elements into Array.

Using ES5

Here we are using concat method

var arr1 = ['a', 'b'];
var arr2 = ['c'];
var arr3 = ['d', 'e'];

var newArr = arr1.concat(arr2, arr3);
console.log(newArr);
// [ 'a', 'b', 'c', 'd', 'e' ]

Click here to see DEMO

Using ES6

Here we are using spread operator. It converts contents of operand elements into Array

const arr1 = ['a', 'b'];
const arr2 = ['c'];
const arr3 = ['d', 'e'];

console.log([...arr1, ...arr2, ...arr3]);
// [ 'a', 'b', 'c', 'd', 'e' ]

Click here to see DEMO

Labels:ES5,ES6

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