Re: 3 obj-c/cocoa beginner q's
Re: 3 obj-c/cocoa beginner q's
- Subject: Re: 3 obj-c/cocoa beginner q's
- From: Steve Bird <email@hidden>
- Date: Tue, 25 Mar 2003 08:55:29 -0500
On Tuesday, March 25, 2003, at 08:30 AM, Ben Dougall wrote:
_____________________________________________________
1.
this is a bit of code from a book i'm following at the moment. it
feels like it might possibly be an inefficient way of doing things.
but then i could easily be wrong:
for (i = 0; i < [myArray count]; i++) {
....
....
}
doesn't this mean that the myArray object will get messaged for every
for loop execution? in other words if the array has 100 elements
myArray is going to get messaged a 100 times? or doesn't that matter?
wouldn't defining an int to hold [myArray count] before going into the
for loop, and using that int in the for loop arguments, therefore only
messaging myArray once, be a better way to do that? or not?
--- A reasonable question, but the [myArray count] is messaged only
once, because that's the way C for loops work. Read the details on FOR
loops - the arguments are evaluated only once to determine parameters,
then the loop is executed.
For that reason it's bad practice to modify the termination condition
([myArray count] in this case), or the increment condition (i++), from
within the loop.
----------------------------------------------------------------
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
www.Culverson.com (toll free) 1-877-676-8175
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