From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: radugrigore@gmail.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] 'a Set?
Date: Wed, 26 Jan 2005 21:04:00 +0900 (JST) [thread overview]
Message-ID: <20050126.210400.42882977.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <7f8e92aa05012603042437cf1c@mail.gmail.com>
From: Radu Grigore <radugrigore@gmail.com>
> On Wed, 26 Jan 2005 11:13:58 +0100, Frédéric Gava
> <frederic.gava@wanadoo.fr> wrote:
> > When I teach Ocaml, many students are lost with
> > this differences.
>
> What puzzeled my is that List/String methods take the structure on
> which they act as the first parameter while the Set/Map methods take
> the structure on which they act as their last parameter. Is there a
> reason?
There seems to be an habit of having side-effecting functions take
their "object" as first parameter, while side-effect-free functions
take them as last.
One reason is that it is natural to specialize side-effecting function
on their "object", as it doesn't change (only its contents do), while
effect-free functions are best seen as transforming their object
(which should be last).
If you respect this convention, the type tells you about the semantics
:-)
Jacques Garrigue
next prev parent reply other threads:[~2005-01-26 12:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-25 23:54 Mike Hamburg
2005-01-26 8:25 ` [Caml-list] " Jean-Christophe Filliatre
2005-01-26 10:13 ` Frédéric Gava
2005-01-26 11:04 ` Radu Grigore
2005-01-26 12:04 ` Jacques Garrigue [this message]
2005-01-26 16:00 ` Alex Baretta
2005-01-26 16:14 ` Jacques Carette
2005-01-26 21:09 ` Mike Hamburg
2005-01-29 9:55 ` Radu Grigore
2005-01-26 9:13 ` Jon Harrop
2005-01-26 15:36 ` Frédéric Gava
2005-01-26 16:06 ` Jon Harrop
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