문제

Is there a programming language in which we can write something like:

a => b

to compute implication? (where a and b are booleans)

The closest I can find is in Scala:

a <= b

But it looks completely different from the actual meaning of "implication".

도움이 되었습니까?

해결책

So the winner is Scala:

implicit class BooleanMagic(val b: Boolean) extends AnyVal {
  def ==>(other: =>Boolean) = !b || other
}

Thanks to that:

> true ==> false
res0: Boolean = false

> false ==> (throw new Exception("I'm the president"))
res1: Boolean = true
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