Node.js unshift() function (original) (raw)

Last Updated : 30 Mar, 2023

unshift() is an array function from Node.js that is used to insert elements to the front of an array.

Syntax:

arrayname.unshift(element)

Parameter: This function takes a parameter that has to be added to the array. It can take multiple elements also as parameters.

Return type: The function returns the array after adding the element. The program below demonstrates the working of the function:

Example 1:

javascript `

function unshiftDemo() { const element = arr.unshift(12); console.log(arr); } const arr = [1, 5, 7, 9, 78]; unshiftDemo();

`

Output:

[12,1,5,7,9,78]

Example 2:

javascript `

function addLang() { const element = arr.unshift("Node.js", "php"); console.log(arr); } const arr = ["C", "Java", "JavaScript", "Python"]; addLang();

`

Output:

[ 'Node.js', 'php', 'C', 'Java', 'JavaScript', 'Python' ]