From: Robert Klemme <shortcutter@...>
Date: 2009-08-28T22:17:21+09:00
Subject: Re: How to call this method

2009/8/28 Robert Dober <robert.dober@gmail.com>:
> the recent thread about all_indicies has somehow made me think that I
> need a more general inject.
> Here is my first shot on it:
> http://pastie.org/597659

I didn't know StopIteration yet.  That's nice.

Your use case is a bit unclear to me.  Also, I do not see why you need
to pass variables via the block.  Somehow that looks suspiciously more
complex to me than it could be.  A few ideas

class String
  def indices rgx, idx = 0
    r = []
    idx = index rgx, idx

    while idx
      r << idx
      idx = index rgx, idx.succ
    end

    r
  end

  def indices2 rgx, idx = 0
    idx = index rgx, idx

    while idx
      yield idx
      idx = index rgx, idx.succ
    end

    self
  end

  def indices3 rgx, idx = 0
    scan rgx do
      i = $`.length
      yield i if i >= idx
    end
  end

  def indices4 rgx, idx = 0
    to_enum(:scan, rgx).inject [] do |r,|
      i = $~.offset(0).first
      yield i if i >= idx
    end
  end
end

irb(main):154:0* "abcabc".indices("a",1)
=> [3]
irb(main):155:0> "abcabc".indices2("a",1) {|i| p i}
"a3
bcabc".indices3("a",1) {|i| p i}
=> "abcabc"
irb(main):156:0> "abcabc".indices3("a",1) {|i| p i}
"abcabc".indices4("a",1) {|i| p i}
3
=> "abcabc"
irb(main):157:0> "abcabc".indices4("a",1) {|i| p i}
3
=> 3
irb(main):158:0>

Ok, I admit, I got carried away. :-)

> But how to call that beast, #inject_with is somehow not really what I like.
> Actually I think #inject would be a nice name, but it is already taken.

Only few come to mind: roll, rotate, circulate

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/