What's the Fastest Way to Code a Loop in JavaScript? - Gregory Reimer's Weblog - The Diigo Meta page

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  for (var i=0, node; node = hColl[i++];) { // do something with node }

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  • In reference to the various comments about reverse counting, the reason checking against 0 is faster then <length, etc is that the ordinal operators <,<=,>, and >= are polymorphic (in the general case -- a sufficiently advanced interpreter may be able to infer types perhaps?) so these operators require type checks on both left and right sides of the operator to determine what comparison behaviour should be used.

       

    In general you should also use the strict === rather than ==, as == will eventually fall back on toString conversion and string comparison.
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  • What's the Fastest Way to Code a Loop in JavaScript?
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