var attr = ~'input,textarea'.indexOf( target.tagName.toLowerCase() )            ? 'value'            : 'innerHTML'   I saw it in an answer, and I've never seen it before.  What does it mean?...
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 want to split a 64bit integer into two 32bit integers:  var bigInt = 0xffffff;  var highInt = bigInt >> 8 // get the high bits 0xfff var lowInt = bigInt // cut of the first part (with &)?  console.log(highInt); // 0xfff console.log(lowInt...
I can already convert 32bit integers into their rgba values like this:  pixelData[i] = {         red: pixelValue >> 24 & 0xFF,         green: pixelValue >> 16 & 0xFF,         blue: pixelValue >> 8 & 0xFF,         alpha:...
I am implementing decoding of BER-compressed integers and recently I've found a weird JavaScript behavior related to bitwise operations with big integers.  E.g.:  var a = 17516032;          // has 25 bits alert(a << 7)              // outpu...
I'm doing some bitwise manipulation in a project and I wonder if the built-in typed arrays might save me some headache and maybe even give me a bit of a performance gain.  let bytes = [128, 129, 130, 131] let uint32 = (bytes[0] << 24) | (by...
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...
Say I have an 8-bit number with a flag at either side:  <flag>0101011 (decimal 43) 0101011<flag> (decimal 43)   Not sure which is more optimal for what's next.  Then say I want to check the flag, and then use the number. Wondering if...

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