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submitted 11 months ago by xia@lemmy.sdf.org to c/programmer_humor@programming.dev

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[-] Faresh@lemmy.ml 7 points 11 months ago

Why the double negation?

[-] rektdeckard@lemmy.world 12 points 11 months ago

It's a handy way to convert any value to a Boolean. If window.chrome is defined and done non-empty value, double negation turns it into just true.

[-] Faresh@lemmy.ml 6 points 11 months ago

I've been wondering why not window.chrome == true or Boolean(window.chrome), but it turns out that the former doesn't work and that == has essentially no use unless you remember some completely arbitrary rules, and that JS developers would complain that the latter is too long given the fact that I've seen javascript code using !0 for true and !1 for false, instead of just true and false because they can save 2 to 3 characters that way.