Using bitwise OR 0 to floor a number

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How does it work? Our theory was that using such an operator casts the
number to an integer, thus removing the fractional part

All bitwise operations except unsigned right shift, >>>, work on signed 32-bit integers. So using bitwise operations will convert a float to an integer.

Does it have any advantages over doing Math.floor? Maybe it’s a bit
faster? (pun not intended)

http://jsperf.com/or-vs-floor/2 seems slightly faster

Does it have any disadvantages? Maybe it doesn’t work in some cases?
Clarity is an obvious one, since we had to figure it out, and well,
I’m writting this question.

  • Will not pass jsLint.
  • 32-bit signed integers only
  • Odd Comparative behavior: Math.floor(NaN) === NaN, while (NaN | 0) === 0

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