[kbp]

One nice feature of blocks is that `return` will return from the enclosing function, rather than the block, so you can write:

    def find(x, l)
      l.each do |y|
        return y if y == x
      end
    end

Where in Lisp you'd use (return-from find x) and in other languages you might pass in a continuation or use a special return value protocol. It's a nice solution for higher order functions that are supposed to feel more language-level.

Also, you can pass functions as arguments like in other languages; lambdas behave like you would expect them to.