Array.prototype.push()

The push() method adds one or more elements to the end of an array and returns the new length of the array.

Syntax

push(element0)
push(element0, element1)
push(element0, element1, ... , elementN)

Example

const array1 = [1, 2, 3, 4];
const array2 = [5, 6, 7, 8];
array1.push(...array2);
// expected output: Array [1, 2, 3, 4, 6, 7, 8]

Array.prototype.concat()

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

Syntax

concat()
concat(value0)
concat(value0, value1)
concat(value0, value1, ... , valueN)

Example

const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = array1.concat(array2);

console.log(array3);
// expected output: Array ["a", "b", "c", "d", "e", "f"]