The difference between null and undefined in JavaScript

In JavaScript, a variable is assigned a value of undefined or null. There's hardly any difference.

undefined = = NULL--->true

But strictly speaking: undefined = = = NULL---> False

You might think that undefined is a vacancy for a system-level, unexpected, or similar error value, and null is an empty representation of a program-level, normal, or expected value. If you want to assign them to variables or attributes, or pass them as arguments to a function, the best option is null.

The difference between null and undefined in JavaScript