Types in Haskell

Lists

        [True, False, True]             [Bool]
        [True, False, True, False]      [Bool]
        [1,2,3,4,5]                     [Integer]
        ['O', 'O', 'P', 'S', 'L', 'A']  [Char]
        "OOPSLA"                        [Char]

• String is accepted as a synonym for [Char]

• Types like [Integer] this should remind you of Java types like List<Integer> etc.

• Just as Java has List<List<Integer>>, Haskell has [[Integer]]

        [ [1,2,3], [4,6], [0,233] ]     [[Integer]]
        [ "I", "like", "pie" ]          [[Char]]
        [17, "foo"]                     Error

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Copyright © 1999,2008 Mark Dominus