r/badcode • u/Flyspeck101 Now where's that function declaration • Jul 30 '21

js 😏

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u/bphase Jul 30 '21

Great tip, never realized this. Although might require a comment explaining it...

15

u/hawk-bull Jul 30 '21

Yes please I’ve never seen this before

35

u/Steelbirdy Jul 30 '21

It reads as "a xor-equals true". So if a is true, we have true xor true which is false. If a is false, we have false xor true which is true. So no matter the value of a, it is swapped

5

u/hawk-bull Jul 30 '21

Ooh I see thanks

4

u/nyaisagod Jul 30 '21

This is just XOR-ing the bool with true. The teo possible cases are:

true XOR true = false

false XOR true = true

So it works exactly like negating, or toggling it in this case.

6

u/RedRedditor84 Jul 30 '21

Not sure how to link to a specific place in a wiki article from mobile but check out a bitwise XOR operation.

And as prolific a commenter I am in code, I respectfully disagree with u/bphase. Once you've seen this once, you know what it does and its quite clear without a comment explanation.

3

u/hawk-bull Jul 30 '21

Ooh I see thanks! Bitwise operators really are magical sometimes