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Undefined type

ECMAScript Language Specification, Version 11
4.3.11. Undefined type

Read this Section of the Authoritative Specification

https://www.ecma-international.org/ecma-262/11.0/index.html#sec-terms-and-definitions-undefined-type

2 Documented Misconceptions

Misconception
NullAndUndefinedAreTheSame
The values null and undefined are the same
Misconception
TypeofNullIsNull
The value null is of type 'null'

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