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Runtime Guards

Runtime Guards

Runtime Guards are a feature.

Guards can easily be implemented using conditions (if !x: return;), but some languages include syntax and semantics specifically for guards.

Languages with Runtime Guards include Haskell, Elixir

Example from Haskell:
f x | x > 0 = 1 | otherwise = 0
Example from Elixir:
def abs(number) when number > 0, do: number def abs(number), do: -number
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