JavaScript Array unshift()

 let languages = ["Java", "Python", "C"]; 
// add "JavaScript" at the beginning of the array languages.unshift("JavaScript");
 console.log(languages); // Output: [ 'JavaScript', 'Java', 'Python', 'C' ]

unshift() Syntax

The syntax of the unshift() method is:

 arr.unshift(element1, element2, ..., elementN)

Here, arr is an array.

unshift() Parameters

The unshift() method takes in an arbitrary number of elements to add to the array.

unshift() Return Value

• Returns the new (after adding arguments to the beginning of array) length of the array upon which the method was called.

Example: Using unshift() method

 var languages = ["JavaScript", "Python", "Java", "Lua"]; 
var count = languages.unshift("C++");
 console.log(languages); // [ 'C++', 'JavaScript', 'Python', 'Java', 'Lua' ] console.log(count); // 5 var priceList = [12, 21, 35]; 
var count1 = priceList.unshift(44, 10, 1.6);
 console.log(priceList); // [ 44, 10, 1.6, 12, 21, 35 ] console.log(count1); // 6

Output

 [ 'C++', 'JavaScript', 'Python', 'Java', 'Lua' ] 5 [ 44, 10, 1.6, 12, 21, 35 ] 6

Also Read:

• JavaScript Array pop()
• JavaScript Array shift()
• JavaScript Program to Add Element to Start of an Array