Programmer Humor

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"Works for me" (lemmy.sdf.org)

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

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[–] rektdeckard 12 points 2 weeks ago (4 children)

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.

[–] [email protected] 6 points 2 weeks ago (3 children)

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.

[–] [email protected] 5 points 1 week ago (1 children)

I've never seen the !0 and !1, it is dumb and indicates either young or terrible devs.

Boolean(window.chrome) is the best, !!window.chrome is good, no need to test if it's equal to true if you make it a boolean beforehand.

[–] RedStrider 1 points 1 week ago

i just added the === true for clarity

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