Flooring using double bitwise not

An interesting tidbit from Thomas Fuchs’ Extreme Javascript Performance:

~~(1 * 12.5) is faster than parseInt(12.5).

The ~~ is a double bitwise not, and the multiplication by one forces a string into a float.

Via Janne’s Delicious stream.

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• November 9, 2009 at 21:59
  in Web development

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