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Thank you. How does Haskell manage to avoid evaluating find_i(...) before invoking p? Since the inner value is the argument to p, it's hard to imagine how p can
by brianberns 11y ago
Thank you. How does Haskell manage to avoid evaluating find_i(...) before invoking p? Since the inner value is the argument to p, it's hard to imagine how p can do anything until it has that value.
EDIT: I think I see the light. The result of find_i(...) is not what's sent to p. Instead, Haskell passes a thunk that might never need to be evaluated.
- tome 11y agoExactly. If I write let f x = 1 print (f (g somethingelse)) then the call to g is never evaluated. f returns 1 immediately.