Re: Suggestion: file:write() and other methods should return file

[Tony Finch <dot@...>]

Javier Guerra Giraldez <javier@guerrag.com> wrote:
> On Sat, Jul 2, 2011 at 10:11 AM, Mark Hamburg <mark@grubmah.com> wrote:
> >
> > io.open( 'foo', 'a+' ):write('fooo'):close():assert()
>
> very interesting.  i'd chose to have a single error class, that
> returns self on _every_ function except :err(), that returns nil,error
> and :assert() that fails
>
> is that style common in any language/library you know?

It's pretty straightforward to do this with Haskell. There's a trivial
implementation of the "maybe monad" in the standard prelude, which either
succeeds with a value or fails with nothing - which is a bit feeble as
error indicators go, but it gives you the idea.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
South Utsire, East Forties: Northerly 5 or 6, becoming variable 4 later.
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