if you ever want to really fuck with someone's head, compare against NaN in JavaScript... - devRant

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Comments

3

balte

2291

7y

(it always returns true. always. whether you compare !== or == or whatever. it's literally always)
3

Username987654

89

7y

@balte NaN == NaN?
2

khateeb321

592

7y

Well, Javascript.
2

ThatPerlDeb

1630

7y

What about 1 === NaN? Can't test right now but that might return false.
3

Hammster

2028

7y

We ask this in our interviews. And its always false not true. This is not just a JavaScript thing.
2

aul12

241

7y

The NaN != NaN thing is defined so in the standard for floating point numbers (IEEE 754).
1

balte

2291

7y

@Hammster ah dammit, you're right. i fucked up because my colleague used !==
1

goodBoiBadDev

4023

7y

well say if

const a = 'asdaxaz'
a == NaN

in this case you are comparing string value with a NaN value rather then checking for NaN. So it is like saying

a == 'string'
1

goodBoiBadDev

4023

7y

always use isNaN()

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