From: "Peña, Botp" <botp@...>
Date: 2008-05-27T11:54:48+09:00
Subject: Re: make hashtable out of 2 strings

From: notnorwegian@yahoo.se [mailto:notnorwegian@yahoo.se] 
# i have 2 strings, i want to take for each char in string1 the same
# indexed char in string2 and make them into a key->value pair.
# how can i iterate a string?

i'm currently playing w ruby1.9 now, so pls bear w me ;)

irb(main):001:0> s1 = "asdf"
=> "asdf"

irb(main):002:0> s2 = "bnmd"
=> "bnmd"

irb(main):004:0> pairs = s1.each_char.zip s2.each_char
=> #<Enumerable::Enumerator:0xbb69d0>

i like the flexibility of enums, so you can do

irb(main):005:0> pairs.each {|x| p x}
["a", "b"]
["s", "n"]
["d", "m"]
["f", "d"]
=> nil

irb(main):006:0> pairs.map{|x|x}
=> [["a", "b"], ["s", "n"], ["d", "m"], ["f", "d"]]

irb(main):014:0> pairs.inject({}){|h,(k,v)| h[k]=v; h}
=> {"a"=>"b", "s"=>"n", "d"=>"m", "f"=>"d"}

irb(main):029:0> pairs.map(&:reverse)
=> [["b", "a"], ["n", "s"], ["m", "d"], ["d", "f"]]

irb(main):032:0> pairs.map(&:first).join
=> "asdf"

kind regards -botp