JavaScript Tutorial For Beginners - NaN (Not a Number)

Hey all, I thought it about time I introduced you all to NaN ;). So in this JavaScript tutorial for beginners I'll be showing you what NaN is (Not a Number) and how we can use it to check whether certain variables are indeed a number or not.

As usual, ask away with any questions you have :).

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[timrots]

funny, this about not a number and this part is one of the only video's without a number in the title

[dhimansanchit]

Really liked the "ain't" to "int" pun there, keep the lessons amusing and interesting :)

[samdavepollard]

> typeof(NaN)==="number"
< true
> NaN===NaN
< false
Gotta love JavaScript. :-)
Many Thanks for sharing your knowledge. Very nice tuts.

[dwayne]

NaN, NaBV, AGV not a number, not a bad video, a good video.

[fleckenfurz]

A reference to Douglas Adams! Chapeau! :))
and btw: great tutorials!!!
greetz from germany

[kennethlim]

amazing tutorials for mere mortals. thanks ninja

[Iashormiguitas]

i don't speak fluently english, but i'm surprised i got it with the accent. good explanation, ty :)

[AllenZitting]

I love the hitchhikers guide to the galaxy reference :)

[igorrudkovskiy]

Great tutorials, though my ears are bleeding. I thinks I can handle few more dozens of HEEEYAAA before going full deaf! 10/10 would watch again!

[artihlec]

I enhance my vocabulary through these videos )) . Is 'thickie' a slang for solid waste matter - aka shit ? Or this one has a different meaning?

[emrecimen]

var a = "apple";
var b = 5;

console.log(a * b +"i");


NaNi

[samuelescateallaucca]

No hablo, ingles pero te entendí a la perfección, min 4:28 taran

[mohammadjunaid]

love your videos, your explanation is the best

[dianacolon]

Thanks, thanks, your video help me a lot!

[vxsniffer]

compare to Python where '7' + 5 gives error and '7' * 3 gives '777'... type coercion in JS is nightmare!

[incanus]

Great tutorial man. Quick question, Why do we need to use isNaN()? Why can't we just check if the variable is an int?

[NeverDieAgl]

I found it interesting, that when a="5", the isNaN function returns false, which means it's a number, but typeof(a) tells that it's a string. Funny little detail.

[aleksandarstojadinovic]

If I got this write from previus lection... U need to check if a is 0 or -0 because in that case U got NaN too?
And I think that easier way to explane "!isNaN(a)" is (if i got it write) if this "isNaN(a)" is not correct do something, else (if that is true) do this? Did I got it write?

[pixelgabriel]

ey, what website would you recomend for js reference?

[VinhLe-gcws]

Should of kept it "that int a number thickie" int = number haha