Nerdy Coffee Recipe

nerdy-coffee.rb

#/usr/bin/ruby

WATER              = 22.2593
WATER_MEASUREMENT  = "ml"
COFFEE             = 0.04493
COFFEE_MEASUREMENT = "g"

def get_water_weight(coffee)
  (coffee.to_f * WATER).ceil.to_s + WATER_MEASUREMENT
end

def get_coffee_weight(water)
  (water.to_f * COFFEE).ceil.to_s + COFFEE_MEASUREMENT
end

puts "Enter amount of coffee (g) or water (ml):"
puts "(For example: 300ml or 42g)"

input               = gets.chomp
weight, measurement = input.split(/(ml|g)/)

if measurement == COFFEE_MEASUREMENT
  puts "For #{weight}g of coffee, you need #{get_water_weight(weight)} of water."
else
  puts "For #{weight}ml of water, you need #{get_coffee_weight(weight)} of coffee."
end