Node.js | unshift() function

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

Syntax:

    
array_name.unshift(element)

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

Return type: The function returns the array after adding the element.

The program below demonstrates the working of the function:

Program 1:

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

Output:

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

Program 2:

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

Output:

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

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Twinkl Bajaj

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