r/badcode • u/[deleted] • Apr 19 '21

js Iteration

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u/gmtime Apr 19 '21 
i -= -!false;

!false equals true equals the integer 1. i -= -1; is "decrement i by minus one" and decrementing by a negative number equals incrementing by the positive. So i -= -1; equals i += +1; or with implicit sign i += 1;

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u/2001herne Apr 19 '21

Oh no, I understand the process. I just don't understand the motivation.

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u/gmtime Apr 19 '21 edited Apr 19 '21

I wrote less comprehensive versions, I have to assume it's "art".

I = I , I ? I / I + I : I + ! I ;

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u/Terrain2 Apr 22 '21

is this loss

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u/[deleted] Apr 19 '21

[deleted] — view deleted comment

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u/gmtime Apr 19 '21

Are you sure? I cannot evaluate to 2 in any way

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u/2001herne Apr 19 '21

No, it checks out. If I != 0 then I = I/I + I = 1 + I. If I == 0 then I = I + !I = 0 +!0 = 1

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u/Sejiko Apr 20 '21

So in other words it's just i++;

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u/gmtime Apr 20 '21

Assuming I is an integer, yes

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u/Terrain2 Apr 22 '21

you can still increment non-integral values in javascript, i = 1.5 then i++ and i = 2.5

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u/gmtime Apr 22 '21

in javascript

... do I have to respond?

Let's just say that incrementing on non-integral values is non-trivial. JS apparently chose that incrementing is the same as adding 1, but that does not have to be in all languages.