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Merge pull request #1006 from nero-luci/master

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Update haskell.html.markdown. Wrong explanation about '$' operator
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Geoff Liu
2015-03-27 10:48:10 -06:00
parent bc7fd77654 e8a1ee8912
commit 1f49ae9306
1 changed files with 8 additions and 7 deletions
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haskell.html.markdown
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@@ -202,19 +202,20 @@ foo = (*5) . (+10)
foo 5 -- 75 foo 5 -- 75
-- fixing precedence -- fixing precedence
-- Haskell has another function called `$`. This changes the precedence -- Haskell has another operator called `$`. This operator applies a function
-- so that everything to the left of it gets computed first and then applied -- to a given parameter. In contrast to standard function application, which
-- to everything on the right. You can use `$` (often in combination with `.`) -- has highest possible priority of 10 and is left-associative, the `$` operator
-- to get rid of a lot of parentheses: -- has priority of 0 and is right-associative. Such a low priority means that
-- the expression on its right is applied as the parameter to the function on its left.
-- before -- before
(even (fib 7)) -- true (even (fib 7)) -- false
-- after -- after
even . fib $ 7 -- true even . fib $ 7 -- false
-- equivalently -- equivalently
even $ fib 7 -- true even $ fib 7 -- false
---------------------------------------------------- ----------------------------------------------------
-- 5. Type signatures -- 5. Type signatures