JavaScript | Array.splice() Method

The Array.splice() method is an inbuilt method in JavaScript which 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 )

Parameter: This method accepts many parameters some of them are described below:

  • index: It is a required parameter. This parameter is the index which start modifying the array (with origin at 0). This can be negative also, which begin after that 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 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.

Below example illustrates the Array.splice() method in JavaScript:

Example:

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<script>
var languages = ['C++', 'Java', 'Html', 'Python', 'C'];
  
document.write(languages + "<br>");
  
// Add 'Julia' and 'Php' after removing 'Html'.
var removed = languages.splice(2, 1, 'Julia', 'Php')
  
document.write(languages + "<br>");
document.write(removed + "<br>");
  
// No Removing only Insertion from 2nd index from the ending
languages.splice(-2, 0, 'Pascal')
document.write(languages)
</script>                    

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Output:

C++,Java,Html,Python,C
C++,Java,Julia,Php,Python,C
Html
C++,Java,Julia,Php,Pascal,Python,C 


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