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 determine if a variable is 'undefined' or 'null'?
On getting the result of the following, you can find whether a variable is null or undefined. If the result is “false”, it means the variable is null and undefined.
Here, the variable results in “True” −
<html>
<body>
<script>
var age = 10;
if(age) {
document.write("True");
} else {
document.write("False");
}
</script>
</body>
</html>
Updated on: 15-Jun-2020
532 Views
Advertisements