I hope that this tutorial helped you understand how undefined and null in JavaScript work and also how to use them.
undefined
null
Now how about NaN (Not-a-Number) which is still legally accepted as a Number in JavaScript? Is NaN a recursive acronym for “NaN’s a Number”?
NaN
Number
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Now how about
NaN(Not-a-Number) which is still legally accepted as aNumberin JavaScript? IsNaNa recursive acronym for “NaN’s aNumber”?