`Array.prototype.push()`

Adds one or more elements to the end of an array and returns the new length.

Syntax

arr.push(...elements)

Name	Type	Required	Description
`elements`	`any`	No	One or more elements to append to the end of the array.

number — The new length of the array after the push.

const a = [1, 2];
const len = a.push(3, 4);
console.log(a, len);

Output

[ 1, 2, 3, 4 ] 4

const a = [];
a.push('x');
console.log(a);

Output

[ 'x' ]

Mutates the array in place and returns the length, not the array. Use the spread operator for a non-mutating append.