& is already used for this purpose by the Lens library...
On Wed, Oct 9, 2013 at 9:51 PM, Wvv
It's looking very strange, that such easy function as flipped function application is still absent at the base.
x # f = f x infixl 1 # -- infix (#) must conflict neither ($), nor (.)
We could add it to Data.Functions and probably to Prelude.
It is very useful function to get rid of parentheses (1); "object looking" record style (2); left-to-right function reading style (3); nice looking last argument-data (4)
1) xs # map $ someLong function x # some . function . composition 2) car # color 3) myString # lines # map words # concat # filter myFilter # unwords 4) eitherData # either (left long function) (right long function)
Many of possible names are already busy. I made the review of possible names:
# - free; disadvantage: possible conflicts with Magic Hash ## - free; disadvantage: heavy looking; possible conflicts with Magic Hash `to` - free; disadvantage: not easy to read composite functions <: - free; & - free; (conflict with fgl package) disadvantage: looking like boolean operator .: - free; .:. - free; disadvantage: many dots <-| - free; disadvantage: long name <+ - free; <~ - free; :~ - free; -|- - free; disadvantage: bad looking; % - busy: Data.Ratio %% - free; disadvantage: heavy looking; ^ - busy: Prelude .^. - free; ^^^ - free; disadvantage: long name |.| - free; disadvantage: strange looking; *$ - free; disadvantage: looking like ($) <| - busy: Data.Sequence < - busy: Prelude << - busy: Text.Html; Text.XHtml.* from html and xhtml package <<< - busy: Control.Category * - busy: Prelude ** - busy: Prelude *** - busy: Control.Arrow <*> - busy: Control.Applicative <**> - busy: Control.Applicative !! - busy: Prelude -| - busy: Control.Parallel.Strategies your suggestion - free;
I prefer (#) , then (.:) and then (<:).
What do you prefer?
Possible looking (copy to your editor to taste them):
2.1 # max 50 # cos # tan # negate # ceiling
2.1 ## max 50 ## cos ## tan ## negate ## ceiling
2.1 `to` max 50 `to` cos `to` tan `to` negate `to` ceiling
2.1 <: max 50 <: cos <: tan <: negate <: ceiling
2.1 & max 50 & cos & tan & negate & ceiling
2.1 .: max 50 .: cos .: tan .: negate .: ceiling
2.1 .:. max 50 .:. cos .:. tan .: negate .:. ceiling
2.1 <-| max 50 <-| cos <-| tan <-| negate <-| ceiling
2.1 <+ max 50 <+ cos <+ tan <+ negate <+ ceiling
2.1 <~ max 50 <~ cos <~ tan <~ negate <~ ceiling
2.1 % max 50 % cos % tan % negate % ceiling
2.1 %% max 50 %% cos %% tan %% negate %% ceiling
2.1 .^. max 50 .^. cos .^. tan .^. negate .^. ceiling
2.1 :~ max 50 :~ cos :~ tan :~ negate :~ ceiling
2.1 |.| max 50 |.| cos |.| tan |.| negate |.| ceiling
2.1 -|- max 50 -|- cos -|- tan -|- negate -|- ceiling
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