Sentinel Value

  1. In computer programming, a sentinel value (also referred to as a flag value, trip value, rogue value, signal value, or dummy data) is a special value in the context of an algorithm which uses its presence as a condition of termination, typically in a loop or recursive algorithm.
    More info on the same here https://en.wikipedia.org/wiki/Sentinel_value
    In Objective-C it looks something like this where 'nil' is the sentinel.
    NSArray *arrayElements = [NSArray arrayWithObjects:@"One",@"Two",@"Three",@"Four", nil];


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