Simple Comparison of Two Methods for clearing array elements using JavaScript _ javascript skills

Source: Internet
Author: User
This article mainly introduces two methods for clearing the array elements in JavaScript, lists several common methods for clearing the array elements in javascript, and compares the two common methods, it has some reference value. If you need it, you can refer to the examples in this article to describe two simple methods for clearing array elements in JavaScript. Share it with you for your reference. The specific analysis is as follows:

There are multiple methods to clear arrays in JavaScript:

Var arr = [1, 2, 3]; arr = []; // method 1 arr. length = 0; // method 2 arr = null; // method 3 delete arr; // Method 4

The first and second most commonly used

Var arr = [1, 2, 3]; // method 1 // advantage: This method is safer if elements in the array arr are used elsewhere. It is also simple and fast // disadvantage: it increases the extra memory overhead and reopens a new empty array arr = []; // method 2 // advantages: if you want to synchronize the effect of the cleared arr element to other places where the arr element is used, it is better to use this option. // disadvantage: After setting the length attribute of the array, this will cause the array to delete the elements whose index is the length and later, so the performance overhead is very high // This method is also the worst of the four methods. Arr. length = 0;

I hope this article will help you design javascript programs.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.