Order Number Generator

gistfile1.rb

# Current time in hex (saves a few chars)
n = Time.now.to_i.to_s(16)

# Add some more random digits and convert to base24 (more entropy w/minimal chars)
n += rand(9999).to_s(24)

# Make sure the whole thing is exactly 10 chars
n.ljust(10).gsub(" ", "0")

# Convert to upcase
n.upcase

👍

Really liked the usage of hex and base64!

def generate_order_id
  # Current time in hex (saves a few chars)
  n = Time.now.to_i.to_s(16)

  # Add some more random digits and convert to base24 (more entropy w/minimal chars)
  n += rand(9999).to_s(24)

  # Make sure the whole thing is exactly 10 chars
  n.ljust(10).gsub(' ') { rand(9) }

  # Convert to upcase
  n.upcase
end

def order_id_to_time(order_id)
  Time.at(order_id[0..7].hex)
end

order_id = generate_order_id

puts order_id
# => 54D77687C86

puts order_id_to_time(order_id)
# => 2015-02-08 12:45:27 -0200