How to delete an object in an array in es6

Method: 1. Use the splice() method, the syntax is "splice (start subscript to be deleted, length to be deleted)", this method will change the original array; 2. Use delete, the syntax For "delete arr [subscript of the object to be deleted]", this method will set the specified value to undefined.

The operating environment of this tutorial: Windows 10 system, ECMAScript version 6.0, Dell G3 computer.

How to delete an object in the array in es6

1. splice method

splice(index,len,[item]) Note: This Method changes the original array.

splice has 3 parameters, it can also be used to replace/delete/add one or several values ​​in the array

index: array starting subscript len: replacement/delete length item : Replacement value. If the operation is deleted, the item will be empty.

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

Delete---- item Not set

arr.splice(1,1) //[‘a‘,‘c‘,‘d‘] 删除起始下标为1，长度为1的一个值，len设置的1，如果为0，则数组不变
arr.splice(1,2) //[‘a‘,‘d‘] 删除起始下标为1，长度为2的一个值，len设置的2

2, delete

delete After deleting the element in the array, the subscripted value will be set to undefined, and 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

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