- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to unset a JavaScript variable?
To unset a variable in JavaScript, use the undefined. After that, use delete operator to completely remove it.
Let’s try the code snippet again.
var str = “Demo Text”; window.onscroll = function() { var y = this.pageYOffset; if(y > 200) { document.write(nxt); nxt = undefined; // unset delete(nxt); // this removes the variable completely document.write(nxt); // the result will be undefined } }
Advertisements