From: Philip <feucht@uni-koblenz.de>
To: caml-list@inria.fr
Subject: Re: [Caml-list] from if...else to pattern matching
Date: Sat, 02 Oct 2010 16:22:41 +0200 [thread overview]
Message-ID: <1286029361.2168.47.camel@io> (raw)
In-Reply-To: <AANLkTinpu++qk2A3UYJ-t+==bbmb-CWikmPMTATjasKi@mail.gmail.com>
On Sat, 2010-10-02 at 16:04 +0200, ben kuin wrote:
> hi
> I try to transform an if-else clause into pattern matching, I think
> I've tried a lot of approaches, but apperently I'm doing something
> fundemently wrong.
>
>
> ~~~~~~~~~
> (** Define behaviors against a constang 'x =< c' with if...else and
> pattern matching.
> I want to see how to match a value against funtion **)
>
> (* defining a '=<' operator *)
> let (=<) a b = if a < b then true else if a == b then true else false;;
>
> let if_test c =
> if ( 4 =< c )then
> true
> else
> false
> ;;
>
> (* and now use the operator in pattern matching * )
> let match_test c =
> match ( _ =< c ) (* pseudocode *)
> | 4 -> true
> | _ -> false
> ;;
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
> thanks in advance
> ben
>
whoa, thats hard,
try:
# let t x = match x with
a when x<=4 -> true
| _ -> false;;
btw, there is a beginner-list and irc-channel,
Philip
> _______________________________________________
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next prev parent reply other threads:[~2010-10-02 14:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-02 14:04 ben kuin
2010-10-02 14:22 ` Philip [this message]
2010-10-02 14:47 ` [Caml-list] " ben kuin
2010-10-02 16:09 ` Hezekiah M. Carty
2010-10-02 17:54 ` Jon Harrop
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