Next | Atypical Types | 56 |
map :: | (p, [a]) -> q |
f :: | p |
h :: | a |
t :: | [a] |
"h must have type a."
map(f, []) = [] map(f, h:t) = f(h) : map(f, t)
"f is used as a function applied to h."
"So f must have type a -> b for some b."
"f must take an argument of type a and return a result of type b."
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Copyright © 1999,2008 Mark Dominus