JavaScript Array splice() Method

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JavaScript Array splice() Method is an inbuilt method in JavaScript that is used to modify the contents of an array by removing the existing elements and/or by adding new elements.

Syntax:

Array.splice( index, remove_count, item_list )

Parameters:

index: It is a required parameter. This parameter is the index from which the modification of the array starts (with the origin at 0). This can be negative also, which begins after many elements counting from the end.
remove_count: The number of elements to be removed from the starting index.
items_list: The list of new items separated by a comma operator that is to be inserted from the starting index.

Return Value:

While it mutates the original array in place, still it returns the list of removed items. In case there is no removed array it returns an empty array.

Example 1: Here is the basic example of the Array splice() method.

Javascript

let webDvlop = ["HTML", "CSS", "JS", "Bootstrap"];
 
console.log(webDvlop);
 
// Add 'React_Native' and 'Php' after removing 'JS'.
let removed = webDvlop.splice(2, 1, 'PHP', 'React_Native')
 
console.log(webDvlop);
console.log(removed);
 
// No Removing only Insertion from 2nd 
// index from the ending
webDvlop.splice(-2, 0, 'React')
console.log(webDvlop)

Output

[ 'HTML', 'CSS', 'JS', 'Bootstrap' ]
[ 'HTML', 'CSS', 'PHP', 'React_Native', 'Bootstrap' ]
[ 'JS' ]
[ 'HTML', 'CSS', 'PHP', 'React', 'React_Native', 'Bootstrap' ]

Example 2: Here is another example of the Array splice() method.

Javascript

let languages = ['C++', 'Java', 'Html', 'Python', 'C'];
 
console.log(languages);
 
// Add 'Julia' and 'Php' after removing 'Html'.
let removed = languages.splice(2, 1, 'Julia', 'Php')
 
console.log(languages);
console.log(removed);
 
// No Removing only Insertion from 2nd index from the ending
languages.splice(-2, 0, 'Pascal')
console.log(languages)

Output

[ 'C++', 'Java', 'Html', 'Python', 'C' ]
[ 'C++', 'Java', 'Julia', 'Php', 'Python', 'C' ]
[ 'Html' ]
[
  'C++',    'Java',
  'Julia',  'Php',
  'Pascal', 'Python',
  'C'
]

We have a complete list of Javascript Array methods, to check those please go through this Javascript Array Complete reference article.

Supported Browsers:

Google Chrome 1 and above
Internet Explorer 5.5 and above
Firefox 1 and above
Opera 4 and above
Safari 1 and above

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.

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Last Updated : 24 Nov, 2023