00 - introduction

O Reilly Ruby Cookbook source code

hash = { "key1" => "val1", "key2" => "val2" }
string = ""
hash.each { |k,v| string << "#{k} is #{v}\n" } 
puts string
# key1 is val1
# key2 is val2
#---
string = ""
hash.each { |k,v| string << k << " is " << v << "\n" } 
#---
puts hash.keys.join("\n") + "\n"
# key1
# key2
#---
data = ['1', '2', '3']
s = ''
data.each { |x| s << x << ' and a '}
s                                             # => "1 and a 2 and a 3 and a "

data.join(' and a ')                          # => "1 and a 2 and a 3"
#---
s = ""
data.each_with_index { |x, i| s << x; s << "|" if i < data.length-1 }
s                                             # => "1|2|3"
#---