The Null Type : Introdunction : Number Data Type JAVASCRIPT TUTORIALS

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The Null Type











The Null type, has only the special value null.

NUll is also its literal.

The value undefined is actually a derivative of the value null, so JavaScript defines them as equal to each other.








alert(null == undefined);    //outputs "true"

Undefined is the value assigned when a variable is declared and not initialized.

Null is the value used to represent an object that doesn't exist.


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