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5324836
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2011-03-16T11:53:30.763
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2011-03-16T11:53:30.763
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JavaScript has the usual assortment of bitwise operators, <code>|</code>, <code>&</code>, <code>~</code>, etc.; details in <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" rel="nofollow">the specification</a>. The following sections will be particularly useful: <ul> <li>Section 11.4.8: Bitwise NOT (<code>~</code>)</li> <li>Section 11.7: Bitwise Shift Operators (<code><<</code> and <code>>></code>)</li> <li>Section 11.10: Binary Bitwise Operators (<code>|</code> and <code>&</code>)</li> </ul> Note that JavaScript's numbers are all floating point (see Section 8.5, The Number Type, in <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" rel="nofollow">the specification</a>), but the bitwise operations are defined in terms of integers. So for instance, the definition of the bitwise NOT operator: <blockquote> 11.4.8 Bitwise NOT Operator ( <code>~</code> ) The production <code>UnaryExpression : ~ UnaryExpression</code> is evaluated as follows: 1. Let <code>expr</code> be the result of evaluating <code>UnaryExpression</code>. 2. Let <code>oldValue</code> be <code>ToInt32(GetValue(expr))</code>. 3. Return the result of applying bitwise complement to <code>oldValue</code>. The result is a signed 32-bit integer. </blockquote> Any decent implementation will be able to handle these efficiently, avoiding unnecessary conversions from <code>Number</code> to internal integer and back.
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1. POBit-tweaking in Javascript
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1. UST.J. Crowder
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1. POBit-tweaking in Javascript
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1. COThank you. Quite comprehensive.
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 USAshwin Krishnamurthy
2. COAnd for even more details see http://bateru.com/news/2011/03/javascript-binary-operations-the-easy-way/
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