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36 lines
912 B
Bash
36 lines
912 B
Bash
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Prelude> let x = \x -> x*x
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Prelude> :t x
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x :: Integer -> Integer
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Prelude> x(2)
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4
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Prelude> x(2.2)
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<interactive>:6:3:
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No instance for (Fractional Integer)
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arising from the literal `2.2'
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Possible fix: add an instance declaration for
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(Fractional Integer)
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In the first argument of `x', namely `(2.2)'
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In the expression: x (2.2)
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In an equation for `it': it = x (2.2)
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Prelude> let mult = \x y->x*y
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Prelude> mult(2,5)
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<interactive>:9:5:
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Couldn't match expected type `Integer' with
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actual type `(t0, t1)'
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In the first argument of `mult', namely `(2, 5)'
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In the expression: mult (2, 5)
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In an equation for `it': it = mult (2, 5)
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Prelude> mult 2 5
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10
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Prelude> :t mult
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mult :: Integer -> Integer -> Integer
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Prelude> let concat = \x y -> x ++ y
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Prelude> concat [1,2,3] [3,2,1]
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[1,2,3,3,2,1]
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Prelude> :t concat
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concat :: [a] -> [a] -> [a]
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