ReferenceError: Use before delaration (Edge) ReferenceError: can't access lexical declaration `variable' before initialization (Firefox) ReferenceError: 'variable' is not defined (Chrome)
Cause of the error: Somewhere in the code, there is a lexical variable that was accessed before initialization.
Example 1: In this example, the const keyword is used with the variable inside the if statement, So the error has occurred.
Example 2: In this example, the keyword is used with the variable, So the error has occurred.
- Function to escape regex patterns before applied in PHP
- CSS page-break-before Property
- CSS | ::before selector
- jQuery | before() Method
- How to write :hover condition for a:before and a:after in CSS?
- How to insert line break before an element using CSS?
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.