Benchmark for Ruby String ID creation

benchmark_ruby_string_id_creation.rb

require 'benchmark'

#RESULTS - 100k iterations
#       user     system      total        real
#   0.590000   0.000000   0.590000 (  0.594802) <- create_id_num - int to radix
#   0.270000   0.000000   0.270000 (  0.267420) <- create_id_str - choosing random characters


@radix = ('0'..'9').to_a + ('a'..'z').to_a + ['$','-','_','+','!','*','(',')',','] #URL safe, lowercase characters
def self.custom_radix_to_s val, digits
  digits = digits.to_a unless digits.respond_to? :[]
  radix = digits.length
  raise ArgumentError, "radix must have at least two digits" if radix < 2

  i = val.to_i
  out = []
  begin
    rem = i % radix
    i /= radix
    out << digits[rem..rem]
  end until i == 0

  out.reverse.join
end

def self.create_id_num(max_len)
  max = @radix.length**max_len #what is the highest value given a set number of characters? For base 10 and 3 characters, it's 10*10*10 = 10**3
  id = rand(1..max) #choose random ID in allowed range
  id = self.custom_radix_to_s(id, @radix) #convert base 10 ID to custom base
  return id
end

def self.create_id_str(max_len)
  id = ""
  (1..max_len).each do |i|
    id.concat(@radix.sample)
  end
  return id
end

iterations = 100000
max_len = 8
Benchmark.bm do |bm|
  bm.report do
    iterations.times do
      create_id_num(max_len)
    end
  end
  bm.report do
    iterations.times do
      create_id_str(max_len)
    end
  end
end