NaN stands for Not a Number : Introdunction : Number Data Type JAVASCRIPT TUTORIALS

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NaN stands for Not a Number













NaN is an odd special value.

In general, this occurs when conversion from another type fails.

NaN cannot be used in mathematical calculations.

NaN is not equal to itself.








alert(NaN == NaN);    //outputs "false"

It is not recommended to use the NaN value itself.

Instead, you can use the function isNaN().








alert(isNaN("blue"));
alert(isNaN("123"));





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