From: Andrew Wagner <wagner.andrew@...>
Date: 2010-10-11T09:04:35+09:00
Subject: Re: More readable array querying

--001636c5b994e133f004924c1a05
Content-Type: text/plain; charset=UTF-8

Thanks for the helpful feedback.

On Sun, Oct 10, 2010 at 6:23 PM, Ryan Davis <ryand-ruby@zenspider.com>wrote:

>
> On Oct 10, 2010, at 13:59 , Andrew Wagner wrote:
>
> > All,
> > I've been playing with some code to make querying an array more readable.
> > Basically, it lets you write one of the following:
> >
> > puts [1,2,3].first that {|x| x.even? }
> > puts [1,2,3].first that is :even
> >
> > instead of this:
> >
> > puts [1,2,3].find {|x| x.even? }
> >
> > The code is below. I'm curious whether you'd find it useful, interesting,
> > worthwhile, etc., and if there are improvements you can think of. Either
> > way, it was a fun little exercise. I love the flexibility I get from
> writing
> > in ruby!
>
> I doubt I would ever want to use this. The amount of readability it adds is
> completely offset by how much slower it is:
>
> # of iterations = 1000000
>                          user     system      total        real
> null_time             0.090000   0.000000   0.090000 (  0.095464)
> ary.find              1.680000   0.010000   1.690000 (  1.717772)
> ary.first that       18.580000   1.140000  19.720000 ( 23.080667)
> ary.first that is    21.770000   0.260000  22.030000 ( 30.326090)
>
> >  def that proc=nil, &block
> >    p = proc.nil? ? block : proc
>
> p = proc || block
>
> >  def is message
> >    lambda { |x| x.send "#{message}?".to_sym }
>
> no need for to_sym at all.
>
> >  def first func=nil
> >    return old_first if func.nil?
> >    each do |x|
> >      return x if func.call x
> >    end
>
> Any reason why you're not using find?
>
> Also, if you don't match, you're going to return self, which would be wrong
> imo.
>
>
>

--001636c5b994e133f004924c1a05--