x <<= y  (x = x << y) x >>= y  (x = x >> y) x >>>= y (x = x >>> y) x &= y   (x = x & y) x ^= y   (x = x ^ y) x |= y   (x = x | y)   What do these different operators do?...
I've seen some performance critical javascript code, like the one on this project that makes extensive use of bitwise OR operations with 0. Ex:  GameBoyAdvanceCPU.prototype.write8 = function (address, data) { address = address | 0; data = data |...
I am trying to understand how bit-wise operation in JavaScript work, more specifically how the 32 bit number resulting from a bit-wise operation is converted back to a 64 bit JavaScript number. I am getting some strange results when setting the left...
I have 5 bit numbers like  10000 01000 00100   If only one bit is on in my calculation i have no problem.  but if 2 bits are on then I want to select only the first on bit for example  10010   i want to treat it as 2 instead of the number 18  is ther...
I want to truncate a number in javascript, that means to cut away the decimal part:  trunc ( 2.6 ) == 2  trunc (-2.6 ) == -2    After heavy benchmarking my answer is:   function trunc (n) {     return ~~n;  }   // or     function trunc1 (n) {    ...
I heard that you could right-shift a number by .5 instead of using Math.floor(). I decided to check its limits to make sure that it was a suitable replacement, so I checked the following values and got the following results in Google Chrome:   2.5 &g...
Edit: This question is out of date as the Polyfill example has been updated. I'm leaving the question here just for reference. Read the correct answer for useful information on bitwise shift operators.    Question:  On line 7 in the Polyfill exam...
I'm using Math.ceil( Math.abs( x ) )  inside a loop.   Can anyone realize any optimization for this operation? (Bitwise or what?)  You are welcome to benchmark at jsperf.com...
Doing some tests with bitwise operations / shifting with JavaScript  0x80000000 >> 1 // returns -1073741824 (-0x40000000)   I would expect that to return 0x40000000 since  0x40000000 >> 1 // returns 0x20000000 0x20000000 >> 1 // ret...
I'm under the impression that the Number type in Javascript stores any number, integer or float, according to the IEEE floating point standard. If so, then why does bitwise OR-ing a number with 0 round it down?  Playing around with some other bit...

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