I'm someone who writes code just for fun and haven't really delved into it in either an academic or professional setting, so stuff like these bitwise operators really escapes me. I was reading an article about JavaScript, which apparently...

I've read 'what are bitwise operators?', so I know what bitwise operators are but I'm still not clear on how one might use them. Can anyone offer any real-world examples of where a bitwise operator would be useful in JavaScript? Th...

I recently found this piece of JavaScript code: Math.random() * 0x1000000 << 0 I understood that the first part was just generating a random number between 0 and 0x1000000 (== 16777216). But the second part seemed odd. What's the poin...

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 trying to find a way to make PHP Bitwise XOR results match the results of JavaScript Bitwise XOR. I came across different questions of this issue, and all without answers. Here are a few of them: Javascript & PHP Xor equivalent php bitw...

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 have the following TypedArray (note that the size of this data is 80 bits): var arr = new Uint8Array([10, 110, 206, 117, 200, 35, 99, 2, 98, 125]); and I want to rotate it by N bits (where N is any integer from 0 to 79). For example, if N=50,...

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) { ...

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