Re: Should I do loops in reverse order ?
Re: Should I do loops in reverse order ?
- Subject: Re: Should I do loops in reverse order ?
- From: Matt Neuburg <email@hidden>
- Date: Mon, 27 Nov 2006 09:22:16 -0800
- Thread-topic: Should I do loops in reverse order ?
On Mon, 27 Nov 2006 17:59:01 +0100, Martin <email@hidden> said:
>Hi,
>
>Let's say I'm looping through an array's objects, and, in that
>particular case, order doesn't matter :
>
>int i;
>for ( i=0 ; i<[myArray count] ; i++ ) {
> // do stuff
>}
>
>Is it much better and should I always do (as order doesn't matter
>here) the following thing...
>
>int i;
>for ( i=[myArray count]-1 ; i>=0 ; i-- ) {
> // do stuff
>}
>
>...in order to call only once [myArray count] instead of calling it
>at each loop ? Is it much faster ? Is there a difference if myArray
>is a NSArray or a NSMutableArray (in that case I also need to assume
>that I don't modify the array's count in "//do stuff").
What I would do is:
int i,u=[myArray count];
for (i=0; i<u; i++)
However, I hope you realize that you aren't supposed to use a for-loop at
all. You're supposed to use an NSEnumerator. :( m.
--
matt neuburg, phd = email@hidden, <http://www.tidbits.com/matt/>
A fool + a tool + an autorelease pool = cool!
AppleScript: the Definitive Guide - Second Edition!
<http://www.amazon.com/gp/product/0596102119>
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