[H-GEN] Which is better?

[Edwin Groothuis]

On Sat, Apr 24, 2004 at 06:12:54PM +1000, Harry Phillips wrote:
> [ Humbug *General* list - semi-serious discussions about Humbug and     ]
> [ Unix-related topics. Posts from non-subscribed addresses will vanish. ]
> 
> A bit of background: I started Uni this year and am doing COMP1500, it's a
> course teaching Object oriented programing using Java.
> 
> I have a question about coding technique. I will give two examples and
> would like to know if anyone knows which is more effcient or if they are
> the same.
> 
> First code:
> int arrayLen = myArray.length;
> for (int i = 0; i < arrayLen; i++)
> ...
> 
> 
> Second one:
> for (int i = 0; i < myArray.length; i++)
> ...

It depends on what you do with the myArray in the loop :-)

If you don't modify it (size-wise), then the first one is best.
If you do modify it (size-wise), then the second one is best.

Also, using a for() loops vs a foreach() loop:
	for (index=0;index<myArray.length;index++) {
		data=myArray[i]
		...
	}
vs
	foreach (myArray as index=>data) {
		...
	}

at the first one you can "skip" elements by increasing the index
in the loop, the second one does all of them. I prefer the second
notation (because it's cleaner with regarding to syntax), but it's
less flexible.

As usual: use the right tool for the job.

Edwin

-- 
Edwin Groothuis      |            Personal website: http://www.mavetju.org
edwin at mavetju.org    |          Weblog: http://weblog.barnet.com.au/edwin/