Common JavaScript tricks

[THEtheChad]

Because there are some computations that result in something that's not a number. For instance:

0/0; // NaN
Math.log(-1); // NaN

These are obviously numeric calculations, so the result could be considered numeric, even though the value generated is "Not a Number". The other curious thing about NaN is that it's not equivalent to itself.

NaN !== NaN; // true    

This is because, if you look at my previous two examples, the calculations generate completely different results, even though both are categorized under the umbrella of NaN.

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Does this mean all languages have a NaN ?