How to remove all array elements in es6

3 ways to remove: 1. Directly assign the array to an empty array "[]", the syntax is "arr=[];". 2. Use the length attribute to set the array length to 0 and truncate all array elements. The syntax is "arr.length=0;". 3. Use the splice() function to delete all elements starting from the head of the array, the syntax is "arr.splice(0,arr.length);".

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

es6 Several ways to remove all array elements

Method 1: Directly assign an empty array[]

Assigning it directly to an empty array[] will clear all previous elements.

Example:

var arr=new Array(1,2,3,4,5,6,7,8,9,10);
console.log(arr);
arr=[];
console.log(arr);

Output result:

This method does not strictly clear the array, but just reassigns arr to Empty array.

Method 2: Use the length attribute to set the array length to 0

The length attribute of the array is generally used to set or return the number of elements in the array, that is, to set or Returns the length of the array.

We can use the feature of setting the length of the array. When the value of the length attribute is less than the length of the array itself, the subsequent elements in the array will be truncated; if the value of the length attribute is 0, the entire array can be cleared.

Example:

var arr=new Array("香蕉","苹果","梨子","橙子","橘子","榴莲");
console.log(arr);
arr.length=0;
console.log(arr);

Output result:

When the value of the length attribute is greater than its own length, the array length will be extended. The element is undefined.

Method 3: Use splice() to delete all array elements

Use the splice() method to delete one or more array elements after the specified subscript position.

Syntax for deleting elements:

array.splice(index,howmany)

• The first parameter index can specify the starting subscript position (that is, the position where the element is deleted);

• The second parameter howmany specifies the number of elements that should be deleted (that is, one or more elements that need to be deleted).
  

You only need to set the first parameter index to 0, that is, delete one or more elements from the beginning of the array.

If you want to clear the array, that is, delete all array elements, you also need to delete the number of elements, that is, set the second parameter howmany to arr.length (array length).

Example:

var arr=new Array("香蕉","苹果","梨子","橙子","橘子","榴莲",12,34);
console.log(arr);
arr.splice(0,arr.length);
console.log(arr);

Output result:

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