Science Memes

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235

if statement == false (i.imgflip.com)

submitted 2 weeks ago by tatterdemalion to c/[email protected]

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[+] [email protected] 1 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

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[–] [email protected] 3 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

In Javascript, Math.random() produces a float value between 0 and 1, so I multiply by 1000 and round it to get a larger integer. The value %2 == 0 is a non-library way of performing isEven() on the random integer (value % 2 is 0 if even, 1 if odd, and the ==0 makes it return a boolean). When used in the if statement, it's essentially a coin flip.

[–] [email protected] 3 points 1 week ago (1 children)

does javascript not allow you to interpret integers as booleans in a conditions directly? seems it'd be simpler to just do math.round(math.random()), which should still get you true (1) or false (0) in equal likelihood. or am i missing something?

[–] [email protected] 1 points 1 week ago* (last edited 1 week ago) (1 children)

It'll give you 1 ~= true or 0 ~= undefined, but I typically use Typescript which prefers actual booleans to boolean-ish

[–] [email protected] 1 points 1 week ago

huh. interesting. i wonder what number it's actually storing for false then?