Undefined vs not defined in javascript

In this video, we are going to have a look at undefined and not defined in JavaScript. These terms might seem to be similar, but they have a very simple difference. Basically, when we are creating a variable, and not assigning any value to it, in such a situation, the type of the variable is undefined. On the other hand, not defined is when we are trying to access something (some variable or some function), that is not defined in our program. Understanding the difference between them is important at times.

Undefined vs not defined in javascript with example

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