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Geekpedia » JavaScript Knowledge Base » How to improve the performance of your for loops

How to improve the performance of your for loops

On Friday, November 2nd 2007 at 02:33 AM

By Andrew Pociu (View Profile)

(Rated 3 with 2 votes)

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Instead of the typical:

for(var i=0; i<theArray.length; i++)
{
// Loop
}

Use:

for(var i=0, arrLen=theArray.length; i<arrLen; ++i )
{
// Loop
}

Because instead of checking the length of the array each loop and comparing it to i, it stores it in a variable arrLen, which is then compared at each loop with i. This saves a few milliseconds, since checking the array length requires slightly more processing power.

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