Several methods to use JS to delete one or more items in an array

Below I will bring you several methods in JS to delete one or more items in an array. Let me share it with you now and give it as a reference for everyone.

1. The splice method in js

splice(index,len,[item]) Note: This method will change the original array.

splice has 3 parameters, it can also be used toreplace/delete/addone or several values ​​in the array

index: array start index len: Length of replacement/deletion item: replacement value, if the deletion operation occurs, the item will be empty

For example: arr = ['a','b','c','d']

Delete---- item is not set

arr.splice(1,1) //['a','c','d'] The deletion starting index is 1 , a value with a length of 1, len is set to 1, if it is 0, the array remains unchanged

arr.splice(1,2) //['a','d']                                                                  A value marked as 1, with a length of 2, replaced by 2

set by len---- item is the replaced value

arr.splice(1,1 ,'ttt') //['a','ttt','c','d'] Replace the starting subscript with 1, a value with length 1 as 'ttt', and the len setting as 1

arr.splice(1,2,'ttt') //['a','ttt','d'] Replace the two values ​​with starting subscript 1 and length 2 as 'ttt', len is set to 1

add---- len is set to 0, item is the added value

arr.splice(1,0,'ttt') / /['a','ttt','b','c','d'] means adding an item 'ttt' at the subscript 1

It seems that splice is the most convenient

2, delete After delete deletes the element in the array, it will set the subscripted value to undefined, The length of the array will not change

For example: delete arr[1] //['a', ,'c','d'] There are two commas in the middle, the length of the array remains unchanged, and one item is undefined

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future, and I also hope everyone will support the PHP Chinese website.

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