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I can not understand what is the main difference between null and undefined.

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    How much research effort is expected of Stack Overflow users? Commented Aug 31, 2021 at 6:20
  • console.log(a) : a is undefined. It doesn't exist at all. typeof a === "undefined". But if you do const a = null, then a is defined. Its value is a null object, but it is defined and exists. typeof a === "object". Commented Aug 31, 2021 at 12:46

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Null: It is the intentional absence of the value. It is one of the primitive values of JavaScript.

Undefined: It means the value does not exist in the compiler. It is a global object.

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