Fast enumeration is the feature of Objective-C, helps in enumerating through a collection. Collections are the fundamental constructs. It is
used to hold and manage the other objects. The main purpose of a collection is, it provides a common way to store and retrieve the object
efficiently.
There are different types of collections in Objective-C. The most common collections in Objective-C are:
- NSSet
- NSDictionary
- NSArray
- NSMutableSet
- NSMutableDictionary
- NSMutableArray
Here is the general form to use fast enumeration in Objective-C:
for(classType variable in collectionObject )
{
statements
}
Objective-C Fast Enumeration Example
Here is an example program, illustrating fast enumeration in Objective-C:
/* Objective-C Fast Enumeration - Example Program */
#import <Foundation/Foundation.h>
int main()
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSArray *array = [[NSArray alloc]
initWithObjects:@"string1", @"string2",@"string3",nil];
for(NSString *aString in array)
{
NSLog(@"Value = %@",aString);
}
[pool drain];
return 0;
}
When we compile and execute the above program, it will produce the following output:
2014-10-15 06:26:22.835 demo[7426] Value = string1
2014-10-15 06:26:22.836 demo[7426] Value = string2
2014-10-15 06:26:22.836 demo[7426] Value = string3
Objective-C Online Test
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