ABC Metric

The ABC score is a triplet of values that represent the size of a code segment (e.g. a method).

It consists of the following counts:

• Assignment => Variables
• Branches => Method calls
• Conditionals => Boolean and logic tests

In addition, a singular Value can be counted as following:

def order_summary(order)
  total = 0                          # Assignment (A)
  discount = 0                       # Assignment (A)

  if order.vip?                      # Condition (C)
    discount = total * 0.1           # Assignment (A)
  end

  order.items.each do |item|         # Branch (B) - calling .each
    total += item.price              # Assignment (A)
  end

  total -= discount                  # Assignment (A)

  puts "Total: #{total}"             # Branch (B) - calling puts
  logger.info("Order processed")     # Branch (B) - calling logger.info

  total > 0 ? total : 0              # Condition (C) - ternary
end