Node.js unshift() function

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

Syntax:

array_name.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' ]