In most programming languages, A collection of a certain finite number of items is an Array. Or the Sets in the Mathematics.

In JavaScript as well, there are many ways to create arrays. We will be taking a look into some of them to create Arrays.

1 . Using assignment operator

var array = [];
var array2 = [1,2,3,4,5];

2. Using new operator

new Array(length)

• Creates an array with length set to the number.
• length > 0 otherwise it will throw error

var arr = new Array(2);
arr; [empty × 2]
arr.length; // 2
arr[0]; undefined
// when we set
arr[3] = 10; //It will increase the array size
[empty × 3, 10]

3. Using Array.from

var arr = Array.from({length : 2});
arr; // [undefined, undefined]
arr[0] = 1; arr[1] = 2;
var arrCopy = Array.from(arr);
arrCopy; // [1,2]

4. Usign Spread operator

var arr =  [1,2,3,4,5]
var array2 = [ ...arr ]
array2; // [1,2,3,4,5]

5. Using Array

Creates a new array with the arguments as items. The length of the array is set to the number of arguments.

var array = Array(1,2,3,4,5);
array; // [1,2,3,4,5]

6. Using Array.of

It is similar to Array constructor . But

• . Array.of(5) → [5]
• Array(5) → [empty x 5]

var array = Array.of(5);
array; / [5]
var array2 = Array.of(1,2,3,4,5,6, "string");
array2; // [1, 2, 3, 4, 5, 6, "string"]