Substitute to comparing with 'NaN'

Question

I have a component which is returning NaN whenever the component is empty. According to the coding guidelines of my project I cannot compare anything to NaN.

Is there any workaround to this?

compare non-strict woth null `object != null` will also check for undefined — Jonas Praem, Jan 10 '19 at 08:30
There is a function called isNaN( testsubject ), returns true or false. — SPlatten, Jan 10 '19 at 08:31
Possible duplicate of [How do you check that a number is NaN in JavaScript?](https://stackoverflow.com/questions/2652319/how-do-you-check-that-a-number-is-nan-in-javascript) — adiga, Jan 10 '19 at 08:38

score 1 · Answer 1 · answered Jan 10 '19 at 08:35

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If you need to check for NaN value you can use isNaN function.

If you need to compare NaN with NaN you can use Object.is(NaN, NaN); // true

Beware Object.is() wont work in older browsers such as IE 11, you can use polyfill from MDN site: click

answered Jan 10 '19 at 08:35

Aleksa Arsić

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score 0 · Answer 2 · answered Jan 10 '19 at 08:44

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You can use isNaN() method, if your parameter is NaN, the method will return true, otherwise will return false. In ES6, Number.isNaN() has the same effect. I don't use "if(object typeof NaN)", you can try it.

answered Jan 10 '19 at 08:44

yangchenxi

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Substitute to comparing with 'NaN'

2 Answers2