Are there more short and tricky codes in javascript? [closed]

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I found the following short and tricky codes on

Double bitwise NOT (~~) - James Padolsey

http://james.padolsey.com/javascript/double-bitwise-not/

Web Reflection: Two simple tricks in JavaScript ( olds, but always useful )

http://webreflection.blogspot.com/2008/06/two-simple-tricks-in-javascript-olds.html

double bitwise not

Math.round(v) === ~~v

Math.floor(v) === ~~v (if v > 0)

isNaN(Number(v)) ? 0 : Number(v) === ~~v(if v is not float)

double not

Boolean(v) === !!v

(!Boolean(v) === !v)

bitwise shift

Math.round(v / 2) === v >> 1

Math.round(v) === 开发者_如何学Gov >> 0

single bitwise not

a.indexOf(v) !== -1 === ~a.indexOf(v)

Are there more short or tricky codes in javascript?

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These "tricks" are not specific to Javascript. A simple search on Google will return a number of pages offering tricks similar.

http://resnet.uoregon.edu/~gurney_j/jmpc/bitwise.html

http://lab.polygonal.de/2007/05/10/bitwise-gems-fast-integer-math/

http://www.beyond3d.com/content/articles/8/