Generate an alphanumeric token of specified length

token_gen.rb

def get_token(length)
  token = ''
  chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'.split('')
  rndGen = Random.new
  (1..length).each do
    token << chars[(rndGen.rand * chars.length).floor] # memory efficient concatenation
  end
  token
end