How do I check for null values in JavaScript?

How do I check for null values in JavaScript?

You can check for null values in JavaScript using the strict equality operator (===) or the loose equality operator (==). For example, you can use if (value === null) to check if a variable is null.

Is there a difference between null and undefined?

Yes, null is an assignment value that represents no value, while undefined means a variable has been declared but not assigned a value.

Can I use the typeof operator to check for null?

No, using typeof value on a null variable will return 'object'. It's better to use strict equality for null checks.

What about using Array.isArray to check for null?

Array.isArray is used to check if a value is an array, not for null checks. Stick to value === null for that.