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' ]
