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Fwd: Re: [Caml-list] The boon of static type checking
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Date: 2005-02-10 (02:27)
From: William D.Neumann <wneumann@c...>
Subject: Re: [Caml-list] String to list to string
On Feb 9, 2005, at 7:10 PM, Juancarlo Añez wrote:

> Why aren't there functions in the standard library to convert strings 
> to
> lists of characters and back?

Because a) they're not all that useful and b) they're trivial to write 
for yourself:

let explode s =
   let rec exh acc = function
   | -1 -> acc
   | i -> exh (s.[i]::acc) (pred i)
   in exh [] (pred (String.length s))

let implode l =
   let s = String.create (List.length l) in
   let rec imh i = function
   | h::t -> s.[i] <- h; imh (succ i) t
   | [] -> s
   in imh 0 l

William D. Neumann

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