objective-c

Value of loop variable after "for in" loop in Objective-C

Is the value of the loop variable in a for - in loop guaranteed to be nil after the loop executes, as long as the loop does not contain a break statement? For example, I'd like to write code like the following:

NSArray *items;
NSObject *item;
for (item in items) {
   if (item matches some criterion) {
      break;
   }
}
if (item) {
   // matching item found. Process item.
}
else {
   // No matching item found.
}

But this code depends on item being set to nil when the for loop runs all the way through with no break.

Solution

  • You should instead use this:

    id correctItem = nil;
for (id item in items) {
    if (item matches some criteria) {
        correctItem = item;
        break;
    }
}