Generate array of all letters and digits

Question

Using ruby, is it possible to make an array of each letter in the alphabet and 0-9 easily?

Answer 1

[*('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)