From: Robert Klemme <bob.news@...>
Date: 2005-01-17T21:51:08+09:00
Subject: Re: Duck Typing and automated Conversions


"David A. Black" <dblack@wobblini.net> schrieb im Newsbeitrag
news:Pine.LNX.4.61.0501160831210.8042@wobblini...
> Hi --
>
> On Mon, 17 Jan 2005, Robert Klemme wrote:
>
> >
> > "David A. Black" <dblack@wobblini.net> schrieb im Newsbeitrag
> > news:Pine.LNX.4.61.0501150344320.20765@wobblini...
> >> Hi --
> >>
> >> On Sat, 15 Jan 2005, Robert Klemme wrote:
> >>
> >>>
> >>> "Mark Hubbart" <discordantus@gmail.com> schrieb im Newsbeitrag
> >>> news:de63abca05011415224d4c29a1@mail.gmail.com...
> >>>>
> >>>> My only argument against the shortcut syntax is that I can't see
how
> >>>> often it could be used, except to simulate static typing. I suspect
> >>>> that adding a feature like this would encourage the use of static
> >>>> typing in methods.
> >>>
> >>> Ok, then we need a poll.  Or we should dig into Ruby's std lib to
see how
> >>> often these methods are called.
> >>
> >> Not very :-)  For 1.8.2:
> >>
> >> $ grep '\.to_str' `find . -name "*.rb"` | grep -v to_string | wc -l
> >>       6
> >> $ grep '\.to_int' `find . -name "*.rb"` | wc -l
> >>       1
> >>
> >> (It's around 700 for to_s and 300 for to_i.)
> >
> > Here's my stat of ruby 1.8.2:
> >
> > $ ruby -e 'Dir["**/*.{h,cC,rb,rw}"].inject(Hash.new(0)){|h,f|
> > File.open(f){|io| io.each{|li| li.scan(/to_\w+/){|m|h[m]+=1}}
> > };h}.sort.each{|k,v| print k," ",v,"\n"}'
> > to_a 193
> > to_above 2
> > to_access_path 1
> > to_addr 3
> [...]
>
> I would tend to want to match /\.to_\w+/, though I guess some things
> have embedded to's (like pixel_to_coords).

But that would not catch cases like def foo() to_s end...

>  Also, some of the ones
> you've found are in comments, such as secs_to_new_year, which is given
> in the documentation as an example of something one might write with
> DateTime, so it really doesn't have much in common with to_str or
> to_int at the language level.

Yeah, it's quite imperfect.  I should have used \b to match word
boundaries.  Still that would catch comments....

> (I do love grepping the lib, I must admit :-)

Apparently. :-)

Regards

    robert