From: "Peña, Botp" <botp@...>
Date: 2007-08-17T17:49:58+09:00
Subject: Re: deleting an object in array, based on object.attribute

From: Josselin [mailto:josselin@wanadoo.fr] 
# I have an array    anArray = [ object_1, object_2, ......  object_n]
# I would like to delete an object in it,    if 
# object.attribute_x = anInteger

delete_if changes the array

irb(main):055:0> a=["a",1,"b",2,3,"c",4]
=> ["a", 1, "b", 2, 3, "c", 4]
irb(main):056:0> a.delete_if{|x| x.is_a? Integer}
=> ["a", "b", "c"]
irb(main):057:0> a
=> ["a", "b", "c"]

reject creates another array copy

irb(main):061:0> a.reject{|x| x.is_a? Integer}
=> ["a", "b", "c"]

select is like reject but w reverse logic

irb(main):066:0> a.select{|x| not  x.is_a? Integer}
=> ["a", "b", "c"]


kind regards -botp