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Fwd: Re: [Caml-list] The boon of static type checking
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Date: | 2005-02-10 (03:40) |
From: | Jon Harrop <jon@j...> |
Subject: | Re: [Caml-list] String to list to string |
On Thursday 10 February 2005 02:10, Juancarlo Añez wrote: > Why aren't there functions in the standard library to convert strings to > lists of characters and back? Outrageously, the core library fails to provide an arbitrary number of arbitrary functions. This exact question came up recently. The answer was essentially: Why string -> char list and not string -> char array? Why string -> char list and not string -> string list? And so on. If you want succinct implementations then I'd go for: let char_list_of_string s = let l = ref [] in String.iter (fun c -> l := c :: !l) s; List.rev !l let string_of_char_list l = String.concat "" (List.map (String.make 1) l) > Haskell treats strings as lists of chars by default. I see an optimisation... -- Dr Jon D Harrop, Flying Frog Consultancy Ltd.