For and ForEach Loops in Objective-C

Loops are the gears of programming: they make your code take action.

The two loops I use most often is the for loop (to do a predefined number of steps) and what is usually called a foreach loop (to move though a list of objects).

//This loop simply repeats an action //a set amount of times: for (int i=0; i<=3; i++) NSLog([NSString stringWithFormat:@"i=%i", i]);

//Create an array of strings for the next example:NSMutableArray *bunchOfThings = [[NSMutableArray alloc] init];[bunchOfThings addObject:@"Zero"];[bunchOfThings addObject:@"One"];[bunchOfThings addObject:@"Two"];[bunchOfThings addObject:@"Three"];

//This is sometimes called a "for each" loop//Using this list will repeat actions for each//object in a list.//Hint: you can use this for any type of list of//objects so if you have list of custom defined//objects this is an easy way to work with them all//at one time.for(NSString *s in bunchOfThings)NSLog([NSString stringWithFormat:@"s=%@", s]);

//The array must be released since it was alloc/init earlier.[bunchOfThings release];