If you read the comments at the jQuery inArray page here, there's an interesting declaration:  !!~jQuery.inArray(elm, arr)    Now, I believe a double-exclamation point will convert the result to type boolean, with the value of true.  What I don...
I have a javascript code:  var c = 267414715; var d = c ^ ("0x81BE16CD");   Result is -1907459466  http://jsfiddle.net/4N3JY/1/  I can't seem to get a PHP equivalent. Have tried the following:  <?php     $c=267414715;  $d=$c ^ hexdec(&...
Suppose we have 1 and this number in base 2 is:  00000000000000000000000000000001   Now I want to flip all bits to get following result:  11111111111111111111111111111110   As far as I know, the solution is to use the ~ (bitwise NOT operator) to flip...
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 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) {    ...
Consider this condition:  (true & true & false & false & true) == true //returns: false   As you can see, the bitwise AND behavior is exactly like logical AND's:  (true && true && false && false &&...
I can't get the & operator to work in an Angular ng-if expression (to use with some bit flags). Suppose we have some HTML like this:  <div ng-if="value & 2"> </div>   If value equals 3, then the bitwise operation shoul...
I have the following code :  var a = parseInt('010001',2); console.log(a.toString(2)); //  10001 var b = ~a; console.log(b.toString(2)); // -10010   The MSDN Say      ~ Performs the NOT operator on each bit. NOT a yields the inverted   value...
I've been given the task of porting Java's Java.util.Random() to JavaScript, and I've run across a huge performance hit/inaccuracy using bitwise operators in Javascript on sufficiently large numbers. Some cursory research states that "...

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