From: Jason Roelofs <jameskilton@...>
Date: 2006-12-19T23:16:40+09:00
Subject: Re: Division hangs irb

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On 12/19/06, Jason Roelofs <jameskilton@gmail.com> wrote:
>
> On 12/19/06, Ashley Moran <work@ashleymoran.me.uk> wrote:
>
> >
> > On 19 Dec 2006, at 14:06, Vincent Fourmond wrote:
> >
> > >   Irb takes the latter as the beginning of a regular expression for
> > > the
> > > first argument of to_f:
> > >
> > >>> (DateTime.now - Date.new (2006,9,15)).to_f /30
> > > /
> > > ArgumentError: wrong number of arguments (1 for 0)
> > >         from (irb):10:in `to_f'
> > >         from (irb):10
> > >         from /usr/lib/ruby/1.8/rational.rb:520
> > >
> > >   Cheers,
> > >
> > >       Vince
> >
> >
> > Thanks Vince, cleared that up
> >
> > I wondered why that didn't work but "10 /5" did
> >
> > Ashley
>
>
>
> to_f vs /
>
> I'll add the appriopriate params to show you what the parser sees:
>
> (DateTime.now - Date.new(2006,9,15)).to_f ( /30 ) # /30 is taken in as a
> single param because of lack of space and because you're calling to_f
>
> 10 /5 => 10./(5) # In this case, / IS the method call, as 10 is not a
> method, so the parser figures this out correctly.
>
> Either way, just put spaces there. It looks better and is easier to read.
>
> Jason
>

One more thing to help you understand:

 (DateTime.now - Date.new(2006,9,15)).to_f() /30 # this will work

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