Variable Promotion and function promotion

Source: Internet
Author: User

Variable Promotion and function promotion

1. Variable Promotion

A variable promotion is the promotion of a variable declaration to the very beginning of the scope in which it is located.

2. Function Promotion

There are two ways to create a function, one is a function declaration, one is a function expression, and only a function declaration is a function promotion.

3. Priority of function promotion and variable promotion

The function promotion is higher than the priority of the variable promotion and is not overwritten by the variable declaration, but is overwritten after the variable is assigned a value.


Variable Promotion and function promotion

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.