Comments on: Data Transformation and Language Syntax http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/ The blog of Sam Newman Mon, 19 Jul 2010 18:05:24 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Ben Butler-Cole http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/comment-page-1/#comment-4641 Ben Butler-Cole Mon, 11 Jan 2010 08:55:31 +0000 http://www.magpiebrain.com/?p=648#comment-4641 The standard is Haskell is to do right-to-left function composition like this: normalize = internationalize . addAreaCode . stripSpaces You do soon get used to reading these. However there is also a left-to-right composition operator, like this: normalize = stripSpaces >>> addAreaCode >>> internationalize Ben The standard is Haskell is to do right-to-left function composition like this:

normalize = internationalize . addAreaCode . stripSpaces

You do soon get used to reading these. However there is also a left-to-right composition operator, like this:

normalize = stripSpaces >>> addAreaCode >>> internationalize

Ben

]]> By: Matt von Rohr http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/comment-page-1/#comment-4627 Matt von Rohr Sun, 10 Jan 2010 21:43:34 +0000 http://www.magpiebrain.com/?p=648#comment-4627 try "->" macro, it threads your expression through a chain of function calls, regardless of the return values. http://exploringclojure.blogspot.com/2010/01/function-chaining.html try “->” macro, it threads your expression through a chain of function calls, regardless of the return values. http://exploringclojure.blogspot.com/2010/01/function-chaining.html

]]> By: Sam Newman http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/comment-page-1/#comment-4610 Sam Newman Sun, 10 Jan 2010 18:49:47 +0000 http://www.magpiebrain.com/?p=648#comment-4610 Ola: I'd really want to pass around whatever the functions return, rather than limiting myself to a raw string. Which I'd imagine limits me to a language with dynamic typing, or else jumping through lots of hoops getting a sufficiently advanced static typing system to be happy with it. Mark: I think comp still works right to left from my reading of the docs. Ola: I’d really want to pass around whatever the functions return, rather than limiting myself to a raw string. Which I’d imagine limits me to a language with dynamic typing, or else jumping through lots of hoops getting a sufficiently advanced static typing system to be happy with it.

Mark: I think comp still works right to left from my reading of the docs.

]]> By: Mark Needahm http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/comment-page-1/#comment-4609 Mark Needahm Sun, 10 Jan 2010 18:41:50 +0000 http://www.magpiebrain.com/?p=648#comment-4609 So if I understand correctly what you want to do is compose several functions together in the order in which they're executed against the input? If so could you make use of the 'comp' function in Clojure or is that the wrong way around which is what I'm maybe thinking after reading the docs again - http://richhickey.github.com/clojure/clojure.core-api.html#clojure.core/comp - ? So if I understand correctly what you want to do is compose several functions together in the order in which they’re executed against the input?

If so could you make use of the ‘comp’ function in Clojure or is that the wrong way around which is what I’m maybe thinking after reading the docs again – http://richhickey.github.com/clojure/clojure.core-api.html#clojure.core/comp – ?

]]> By: Ola Bini http://www.magpiebrain.com/2010/01/10/data-transformation-and-language-syntax/comment-page-1/#comment-4608 Ola Bini Sun, 10 Jan 2010 18:39:38 +0000 http://www.magpiebrain.com/?p=648#comment-4608 Ioke could definitely do it, although I don't have an operator for it right now. I've considered adding it, though. I would probably not send around raw strings - so if you assume you have something else, you can simply do it like this, where the three methods are defined on PhoneNumberText PhoneNumberText from("44 1230 9183") stripSpaces addAreaCode internationalize F# have a serialization construct with the |> operator. You can also use <| for it. Take a look in Needhams blog for a number of examples. Ioke could definitely do it, although I don’t have an operator for it right now. I’ve considered adding it, though. I would probably not send around raw strings – so if you assume you have something else, you can simply do it like this, where the three methods are defined on PhoneNumberText

PhoneNumberText from(“44 1230 9183″) stripSpaces addAreaCode internationalize

F# have a serialization construct with the |> operator. You can also use <| for it. Take a look in Needhams blog for a number of examples.

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