| 5. 1. 13. NaN stands for Not a Number |
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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. |
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alert(NaN == NaN); //outputs "false"
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It is not recommended to use the NaN value itself. |
Instead, you can use the function isNaN(). |
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alert(isNaN("blue"));
alert(isNaN("123"));
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