How do I check for null in JavaScript?

How do I check for null in JavaScript?

In JavaScript, you can check for null using the strict equality operator (===) or the loose equality operator (==). For example, you can use if (value === null).

What's the difference between == and ===?

The == operator checks for equality after converting the operands to a common type, while === checks for equality without type conversion, meaning both value and type must be the same.

Can I use typeof to check for null?

No, typeof will return 'object' for null values. It's better to use strict equality (===) to check for null.

What about undefined? How do I check for that?

You can check for undefined using if (value === undefined). Just like null, it's best to use strict equality for accurate checks.