Generate array of all letters and digits
[*('a'..'z'), *('0'..'9')] # doesn't work in Ruby 1.8
or
('a'..'z').to_a + ('0'..'9').to_a
or
(0...36).map{ |i| i.to_s 36 }
(the Integer#to_s
method converts a number to a string representing it in a desired numeral system)
You can also do it this way:
'a'.upto('z').to_a + 0.upto(9).to_a
for letters or numbers you can form ranges and iterate over them. try this to get a general idea:
("a".."z").each { |letter| p letter }
to get an array out of it, just try the following:
("a".."z").to_a