4 ms·
Yes, but this is bigger than that. JavaScript doesn't define NaN, IEEE-754 defines NaN and JavaScript takes its definition from that. So it's IEEE-754 thinks nu
by simonsarris 15y ago
Yes, but this is bigger than that. JavaScript doesn't define NaN, IEEE-754 defines NaN and JavaScript takes its definition from that. So it's IEEE-754 thinks num == num being false is a good test for NaN.
For the record, isNaN in JavaScript is also not necessarily the fastest way of doing it: http://jsperf.com/nantest http://jsperf.com/nantest
- masklinn 15y ago> For the record, isNaN in JavaScript is also not necessarily the fastest way of doing it Which will absolutely not matter in 100% of the cases after rounding. `isNaN` is simple (your original criteria) and clearly says what it's doing.