Difference between revisions of "Direction of data flow"
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(translated table from the german page) |
(let vs. where) |
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| monadic composition || <hask> f >>= g </hask> |
| monadic composition || <hask> f >>= g </hask> |
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| + | |- |
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| + | | let expression || <hask> let x = 2 in x*x </hask> || (first definition, then usage) |
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| monadic composition || <hask> g =<< f </hask> |
| monadic composition || <hask> g =<< f </hask> |
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| + | |- |
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| + | | where clause || <hask> x*x where x = 2 </hask> || (first usage, then definition) |
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Latest revision as of 11:49, 20 March 2007
In Haskell the direction of data flow symbolized by the notations differs amongst the notations. Both directions occur equally frequently:
from left to right:
| function definition | f x = x*x |
(input left, output right) |
| Lambda | \ x -> x*x
| |
| do notation | do f; g
| |
| monadic composition | f >>= g
| |
| let expression | let x = 2 in x*x |
(first definition, then usage) |
from right to left:
| function application | f x, f $ x |
(input right, applied function left) |
| composition | g . f
| |
| results of monads | do x <- f
| |
| monadic composition | g =<< f
| |
| where clause | x*x where x = 2 |
(first usage, then definition) |
Weblinks
- http://www.haskell.org/pipermail/libraries/2005-August/004315.html
- http://www.iba-cg.de/doc/hal1-haskell-with-style.pdf
See also
There is still something to translate from De/Flussrichtung