Different ways to create Array in JavaScript

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Array is very frequently used while working in JavaScript. In this article, we will see the different ways to create Array in JavaScript.

1. Using Array function

It creates a new array with items passed as argument.

let array = Array(10,20,50,41,78);
console.log(array); // Output: [10,20,50,41,78]

2. Using Array literal

An array literal is the easiest way to create a JavaScript Array.

let array = []; // It creates an empty array
let array2 = [10,20,50,41,78]; // It created an empty array with 5 values in it

3. Using new operator

It creates a new array with length

var arr1 = new Array(4); // [empty × 4] It creates an array with length

4. Using Spread operator

The spread operator was added to JavaScript in ES6 (ES2015).

let array1 =  [10,20,50,41,78]
let array2 = [ ...arr ];
console.log(array2); // Output: [10,20,50,41,78]

5. Using Array.from

let array1 = Array.from({length : 2});
console.log(array1); // output: [undefined, undefined]
array1[0] = 10; arr[1] = 20;
console.log(array1); //Output : [10, 20];

Find much more about JavaScript libraries/frameworks at jsonworld

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