Does fast enumeration in Objective-C guarantee the order of iteration?

Posted by Ranking Stackingblocks on Stack Overflow See other posts from Stack Overflow or by Ranking Stackingblocks
Published on 2010-05-06T00:12:08Z Indexed on 2010/05/06 0:18 UTC
Read the original article Hit count: 219

Filed under:

objective-c

|

fast-enumeration

|

array

|

iteration

Can I expect it to go from the start of an array to the end in order? Can't find anything in the docs about this.

i.e. is

for (id val in array)
{
   NSLog(@"%@", val);
}

always going to print out the same as

for (int i = 0; i < [array count]; ++i)
{
   NSLog(@"%@", [array objectAtIndex:i]);
}

© Stack Overflow or respective owner

Related posts about objective-c

Blocking access to websites with objective-C / root privileges in objective-C

as seen on Stack Overflow - Search for 'Stack Overflow'
I am writing a program in Objective-C (XCode 3.2, on Snow Leopard) that is capable of either selectively blocking certain sites for a duration or only allow certain sites (and thus block all others) for a duration. The reasoning behind this program is rather simple. I tend to get distracted when I… >>> More
Objective-C with some Objective-C++, calling a normal c++ method "referenced from" problem

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I made an Objective-C project for the iPhone. I had only one cpp class, the soundEngine taken from some Apple demo. Now I'm trying to merge OpenFeint which is coded in Objective-C++. As soon as I drop in the code without even referring to it from my code, when I hit Build, my Objective-C code… >>> More
Add an objective @property attribute in objective-c

as seen on Stack Overflow - Search for 'Stack Overflow'
Does anyone know of a way to add additional attribute types to the @property keyword without modifying the compiler? Or can anyone think of another way to genericize getter/setter creation? Basically, I have a lot of cases in a recent project where it's handy for objects to lazily instantiate their… >>> More
ObjectiveC builtin template system ?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am developing an iPhone application and I use HTML to display formatted text. I often display the same webpage, but with a different content. I would like to use a template HTML file, and then fill it with my diffent values. I wonder if ObjectiveC has a template system similar to ERB in Ruby. That… >>> More
ObjectiveC Syntax for Specifying Protocol Name in Method Argument

as seen on Stack Overflow - Search for 'Stack Overflow'
What's the ObjectiveC syntax for specifying a protocol as an argument in a method? Say I have 2 protocols, MyProtocol and MyProtocolCB: @protocol MyProtocolCB <NSObject> - (void) func; @end @protocol MyProtocol <NSObject> - (void) register:(MyProtocolCB*) cb; @end I'm receiving this… >>> More

Related posts about fast-enumeration

Is Fast Enumeration messing with my text output?

as seen on Stack Overflow - Search for 'Stack Overflow'
Here I am iterating through an array of NSDictionary objects (inside the parsed JSON response of the EXCELLENT MapQuest directions API). I want to build up an HTML string to put into a UIWebView. My code says: for (NSDictionary *leg in legs ) { NSString *thisLeg = [NSString stringWithFormat:@"<br>%@… >>> More
Does fast enumeration in Objective-C guarantee the order of iteration?

as seen on Stack Overflow - Search for 'Stack Overflow'
Can I expect it to go from the start of an array to the end in order? Can't find anything in the docs about this. i.e. is for (id val in array) { NSLog(@"%@", val); } always going to print out the same as for (int i = 0; i < [array count]; ++i) { NSLog(@"%@", [array objectAtIndex:i]); } >>> More
How to close all tabs in Safari using AppleScript?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have made a very simple AppleScript to close all tabs in Safari. The problem is, it works, but not completely. Here's the code: tell application "Safari" repeat with aWindow in windows repeat with aTab in tabs of aWindow aTab close end repeat end repeat end tell I've also tried this… >>> More
Compare NSArray with NSMutableArray adding delta objects to NSMutableArray

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an NSMutableArray that is populated with objects of strings. For simplicity sake we'll say that the objects are a person and each person object contains information about that person. Thus I would have an NSMutableArray that is populated with person objects: person.firstName person.lastName person… >>> More
How to iterate over an dictionary without knowing the keys, while getting key and object?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have an NSDictionary and want to iterate over the objects. But at the same time, I need to know the key of the dictionary. I remember there was a special, fancy form of fast enumeration, but have forgotten the exact syntax. Anyone? >>> More