[Haskell] Why is getArgs in the IO monad?

[Conal Elliott]

How about a semantic answer instead of an operational one?

If getArgs had type [String], then its denotation must be a (lazy) list
of (lazy) sequences of characters (extended by bottom).  For instance,
the expression (words "hello world") denotes the list ["hello","world"].
What list would "getArgs" denote?

     - Conal

-----Original Message-----
From: haskell-bounces at haskell.org [mailto:haskell-bounces at haskell.org]
On Behalf Of Abraham Egnor
Sent: Monday, January 17, 2005 1:31 PM
To: Jim Apple
Cc: haskell at haskell.org
Subject: Re: [Haskell] Why is getArgs in the IO monad?

It's not a constant; see, for example, System.Environment.withArgs
(http://www.haskell.org/ghc/docs/latest/html/libraries/base/System.Envir
onment.html#v%3AwithArgs).

Abe


On Mon, 17 Jan 2005 16:23:17 -0500, Jim Apple <japple at freeshell.org>
wrote:
> See subject. It seems that it would be constant through execution, and
> so could be just [String].
> 
> Jim
> 
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