From: "Simon Kröger" <SimonKroeger@...>
Date: 2007-08-04T20:20:00+09:00
Subject: Re: Running multiple closures per iteration

Tim Pease schrieb:
> On 8/3/07, Joshua Chia <joshchia@gmail.com> wrote:
>> Joel VanderWerf wrote:
>>> Did you mean
>>>
>>> o = a.select {|x| x >= 0}
>>> p = o.inject(0) {|s, x| s += x}
>>>     ^^^
>>>      ?
>>>
>> No, I meant to compute two different things from a.
> 
> Well, it's not pretty, but here's my best shot at it
> 
> o, p = a.inject( [[], 0] ) do |ary,x|
>   ary[0] << x if x >= 0
>   ary[1] += x
>   ary
> end

you can beautify this to

o, p = a.inject( [[], 0] ) do |(l, s), x|
  [x >= 0 ? l << x : l, s + x]
end

> I don't think Ruby natively supports such a creature, though. Please
> correct me if I'm wrong.

Well, depends on what 'natively' realy means...

> Blessings,
> TwP

cheers

Simon