JavaScript Splice () method

Definition and usage

JavaScript splice () is the most powerful, and it can be used to insert, delete, or replace elements of an array. Here is a brief introduction, interested friends

The splice () method adds/deletes an item to/from the array, and then returns the item that was deleted.

Note: This method changes the original array.

Grammar

Arrayobject.splice (index,howmany,item1,....., ItemX)

Parameters	Description
Index	Necessary. An integer that specifies the location of the Add/remove item, using a negative number to specify the position from the end of the array.
Howmany	Necessary. The number of items to delete. If set to 0, the item is not deleted.
Item1, ..., ItemX	Optional. Adds a new item to the array.

return value

type	Description
Array	A new array containing the deleted items, if any.

Description

The splice () method deletes 0 or more elements starting at index and replaces the deleted elements with one or more values declared in the argument list.

If the element is removed from the Arrayobject, the array containing the deleted element is returned.

1. Delete-Used to delete elements, two parameters, first parameter (to remove the position of the first item), second parameter (number of items to delete)
2. Insert-Inserts any item element into the specified position in the array. Three parameters, first parameter (in fact position), second argument (0), third parameter (inserted item)
3. Replace-Inserts any item element at the specified position in the array, deleting any number of items, three parameters. First parameter (start position), second parameter (number of items deleted), third parameter (insert any number of items)

look at the code below and you'll see.

Copy CodeThe code is as follows:
var lang = ["PHP", "Java", "JavaScript"];
Delete
var = lang.splice (removed);
alert (lang); Php,javascript
alert (removed); Java, returning the deleted item
Insert
var insert = Lang.splice (0,0, "ASP"); Insert starting from No. 0 position
alert (insert); Returns an empty array
alert (lang); Asp,php,javascript
Replace
var replace = Lang.splice ("C #", "Ruby"); Delete one item, insert two items
alert (lang); Asp,c#,ruby
alert (replace); PHP, returning Deleted Items

JavaScript Splice () method