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caffo/unless.io

Created January 10, 2012 14:29
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unless.io
unless := method(
(call sender doMessage(call message argAt(0))) ifFalse(
call sender doMessage(call message argAt(1))) ifTrue(
call sender doMessage(call message argAt(2)))
)
unless(1 == 2, write("One is not two\n"), write("one is two\n"))
@jmcarthur
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In Haskell:

unless p a b = if p then b else a

If if was just a function instead of special syntax (or one had defined a function with the same behavior), it could look like this:

unless = if . not

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