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Guards Guards – small gotcha in Elixir guard expressions

hauleth.dev

1 points by hauleth · 3 comments

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turtleyacht

Elixir does not short-circuit its if-then either:

  if false or true do
    IO.puts("did not short-circuit (?)")
  end
Maybe because `if' is a macro, the whole expression is sent in for evaluation:

https://elixir-lang.readthedocs.io/en/latest/intro/5.html#if...

  • haulethOP

    What do you mean there? What is not short-circuited there?

    • turtleyacht

      The whole thing `false or true' is sent in for evaluation, so if there is a side-effect function that returns `true', it is executed too. Because Elixir treats it as a macro and not short-circuit.

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