I've been reading through some code and noticed a function:
randint: function(n) {
return ~~(Math.random() * n)
}
I know ~ means "not" but how does ~~ change this return statement?
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9
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2It's two NOT bitwise operators in a row – m0meni Sep 22 '16 at 19:26
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4It's a way of forcing a numeric value to be "squeezed" into a 32-bit integer value. – Pointy Sep 22 '16 at 19:27
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5It's a common way to draw a mustache ? – adeneo Sep 22 '16 at 19:35
1 Answers
16
"but how does ~~ change this return statement?"
Answer: It cuts all fractional digits.
~~42.453754 -> 42
tmuecksch
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