Question

171

Where would I use a bitwise operator in JavaScript?

rated 0 times [ 178] [ 7] / answers: 1 / hits: 35308 / 16 Years ago, tue, march 17, 2009, 12:00:00

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?

Thanks.

Edit:

Just digging into the jQuery source I've found a couple of places where bitwise operators are used, for example: (only the & operator)

// Line 2756:

event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));



// Line 2101

var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;

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sherryd

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3 Years ago

answered 16 Years ago kaitlyn · Accepted Answer

Example:

Parses hexadecimal value to get RGB color values.

var hex = 'ffaadd';

var rgb = parseInt(hex, 16); // rgb is 16755421





var red   = (rgb >> 16) & 0xFF; // returns 255

var green = (rgb >> 8) & 0xFF;  // 170

var blue  = rgb & 0xFF;     // 221