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Showing content from https://webplatform.github.io/docs/javascript/Array/splice below:

splice · WebPlatform Docs

splice Summary

Removes elements from an array and, if necessary, inserts new elements in their place, returning the deleted elements.

Syntax

splice( start, deleteCount,  [ item1 [, item2 [, . . . [, itemN ]]]])

start: Required. The zero-based location in the array from which to start removing elements.
deleteCount: Required. The number of elements to remove.
item1, item2,. . ., itemN: Optional. Elements to insert into the array in place of the deleted elements.

Examples

The following code shows how to use the splice method.

var arr = new Array("4", "11", "2", "10", "3", "1");
 arr.splice(2, 2, "21", "31");
 document.write(arr);

Remarks

The splice method modifies arrayObj by removing the specified number of elements from position start and inserting new elements. The deleted elements are returned as a new Array object.