this post was submitted on 21 Dec 2024
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Fun Loops ▶️

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[–] [email protected] 8 points 2 months ago (2 children)

That would be isPositive.

Without using the modulo operator you'd essentially have to reimplement it. Divide the number by 2 and round down. Multiply that by 2 and then subtract it from the original number.

isEven(10) results in 10-10==0 (true) whereas isEven(13) results in 13-12==0 (false).

function isEven(n){
  n = Math.abs(n)
  return (n - (Math.floor(n/2) * 2)) == 0
}
[–] [email protected] 5 points 2 months ago

Yep! I'm wrong. Pretty embarrassing!

That's a nice solution though! Gonna have to try and remember that one!

[–] [email protected] 4 points 2 months ago* (last edited 2 months ago)

Minor simplification: this works even without taking absolute value first of you use fix instead of floor.

Edit: I don't know if fix is in the stock math library on second thought...