I'm a fan of ruby's each method for the fact that you can use it as an interface to make any object enumerable (or what other languages call iterable).
I particularly love it for the lazy evaluation. You can iterate over a collection of infinite size like a prime number generator or like something I did the other day, wrap a large remote resource but make it feel like any other local one. You just stream in as much of it as you need and no more.
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