From: Sergey Sheypak <serega.sheypak@...>
Date: 2010-02-12T18:50:58+09:00
Subject: Problem with array in hash

require 'p'

lol = {}
lol[:arr] = []
puts "#{lol[:arr].class} obj_id=#{lol[:arr].object_id}"

lol[:arr] + [Task.new(:id => 'id01')]
pp lol
puts "#{lol[:arr].class} obj_id=#{lol[:arr].object_id}"

lol[:arr] + [Task.new(:id => 'id02')]
pp lol
puts "#{lol[:arr].class} obj_id=#{lol[:arr].object_id}"

lol[:arr] + [Task.new(:id => 'id03')]
pp lol
puts "#{lol[:arr].class} obj_id=#{lol[:arr].object_id}"

Produces:
Array obj_id=23293860
{:arr=>[]}
Array obj_id=23293860
{:arr=>[]}
Array obj_id=23293860
{:arr=>[]}
Array obj_id=23293860
---What does it mean? Nothin has been added

lol = {}
lol[:arr] = []
lol[:arr] << Task.new(:id => 'id01')
pp lol
lol[:arr] << Task.new(:id => 'id02')
pp lol
lol[:arr] << Task.new(:id => 'id03')
pp lol



Produces:
{:arr=>[Task[|id => id01|]]}
{:arr=>[Task[|id => id02|], Task[|id => id02|]]}
{:arr=>[Task[|id => id03|], Task[|id => id03|], Task[|id => id03|]]}
---Why does each insertion replaces each elem in array?

!!!but!!!
arr = []
arr << Task.new(:id => 'id01')
pp arr
arr << Task.new(:id => 'id02')
pp arr
arr << Task.new(:id => 'id03')
pp arr

produces:
[Task[|id => id01|]]
[Task[|id => id02|], Task[|id => id02|]]
[Task[|id => id03|], Task[|id => id03|], Task[|id => id03|]]
---it's ok...
-- 
Posted via http://www.ruby-forum.com/.