From: Minero Aoki <aamine@...>
Date: 2002-11-18T18:13:12+09:00
Subject: ruby-dev summary 18711-18810

Hi all,

This is a summary of ruby-dev ML in these days.

[ruby-dev:18651] Enumerable#zip (contd.)

  Matz has noted some preconditions about this issue:

    * The main reason to introduce Enumerable#zip is the parallel
      iteration (to be precise, "finite parallel each").

    * We should not use Thread/Continuation.

    * We should not use external iterator (Iterator pattern).

    * (on zip) We should not raise exceptions when the length of the
      components are differ.

  Under these conditions, following candidates are remained:

    # Enumerable#zip
    for x,y in a.zip(b) do ... end
    a.zip(b).each {|x,y| ...}
        # Problem: If the length of a and b are different,
        # which one should we choose?  The default value/block does
        # not resolve this problem, because it is equal to the
        # "choose longest" strategy.

    # Enumerable#sync_each
    a.sync_each(b,c) {|a,b,c| ... }
        # Problem: "sync_each" is not a good name.

  Following candidates have been already rejected:

    # Array.zip --- "Array." is too redundant for our aim.
    for x,y in Array.zip(a,b) do ... end
    Array.zip(a,b).each {|x,y| ...}

    # Enumerable#map_with_index --- too long description.
    a.map_with_index {|x,idx| [a, b[idx]] }.each {|x,y| ... }

    # Array#zip --- Temporal object (an array in this case)
    #               should not be a receiver.
    for x,y in [a,b].zip do ... end
    [a,b].zip.each {|x,y| ... }

    # Kernel#zip --- We already have too many toplevel methods.
    zip(a,b).each {|x,y| ... }

[ruby-dev:18711] another implementation of pstore

  Current pstore.rb may crash a database file when a ruby process
  is interrupted on certain bad timings. YANAGAWA Kazuhisa announced
  his implementation of pstore.rb, which resolves such problems.

  You can get it from:

    http://www.dm4lab.to/~kjana/ruby/ps.tar.gz

  NOTE: He does NOT intend on replacing current implementation.
  This is just a sample, by now.

[ruby-dev:18739] change chomp!

  Shin-ichiro HARA suggested that String#chomp should cut off
  CR and LR at once.  Knu pointed out that ruby 1.7 already acts
  like such.


-- Minero Aoki