in statement in for loop

i have a for lo开发者_开发问答op state ment as under:

    for(NSString* name in nameArray)

nameArray is NSArray.

In the above statement, what does it mean for: NSString* name in nameArray

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Iterate through all NSString* in nameArray. Can be written less cleanly:

for (int i=0;i<[nameArray count];++i) {
    NSString *name = [nameArray objectAtIndex:i];
    // Do stuff
}

Keep in mind: Don't iterate a mutable array and mutate it (and make sure no other thread does). In such a case you need to call count every iteration like displayed above.

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This is fast enumeration syntax introduced in Objective-C 2.0. Check this tutorial for the details. Also you can Google "objective c fast enumeration" for many other resources available online.

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It means that the code inside the parenthesis will be executed for every object in the nameArray, which you will access through the NSString *name variable.