How to loop through every element in an NSArray

We can use something called Fast Enumeration for this, using a modified for loop:

// build an array
NSArray *myArray = [[NSArray alloc]initWithObjects:@"One", @"Two", @"Three", @"Four", nil];
// loop through every element (dynamic typing)
for (id tempObject in myArray) {
    NSLog(@"Single element: %@", tempObject);
}

You don’t have to use dynamic typing if you know the types of objects you’re using. In our example this would work just as well:

// build an array
NSArray *myArray = [[NSArray alloc]initWithObjects:@"One", @"Two", @"Three", @"Four", nil];
// loop through every element (static typing)
for (NSString *tempObject in myArray) {
    NSLog(@"Single element: %@", tempObject);
}

Fast Enumeration also works with NSDictionaries of course:

// build a dictionary
NSDictionary *myDictionary = [[NSDictionary alloc]initWithObjectsAndKeys:@"One", @"1", @"Two",@"2", @"Three", @"3",nil];
// loop through it (dynamic typing)
for (id tempObject in myDictionary) {
    NSLog(@"Object: %@, Key: %@", [myDictionary objectForKey:tempObject], tempObject);
}