38 lines
1019 B
Plaintext
38 lines
1019 B
Plaintext
!import "../lib/Patterns.tri" !Local
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-- We can do conditional pattern matching by providing a list of lists, where
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-- each sublist contains a boolean expression and a function to return if said
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-- boolean expression evaluates to true.
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value = 42
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main = match value [[(equal? "Hello") (_ : ", world!")] [(equal? 42) (_ : "The answer.")]]
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-- < main
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-- > "The answer."
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matchExample = (x : match x
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[[(equal? 1) (_ : "one")]
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[(equal? 2) (_ : "two")]
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[(equal? 3) (_ : "three")]
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[(equal? 4) (_ : "four")]
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[(equal? 5) (_ : "five")]
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[(equal? 6) (_ : "six")]
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[(equal? 7) (_ : "seven")]
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[(equal? 8) (_ : "eight")]
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[(equal? 9) (_ : "nine")]
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[(equal? 10) (_ : "ten")]
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[ otherwise (_ : "I ran out of fingers!")]])
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-- < matchExample 3
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-- > "three"
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-- < matchExample 5
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-- > "five"
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-- < matchExample 9
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-- > "nine"
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-- < matchExample 11
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-- > "I ran out of fingers!"
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-- < matchExample "three"
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-- > "I ran out of fingers!"
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-- < matchExample [("hello") ("world")]
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-- > "I ran out of fingers!"
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