Method Return

Methods can return early for guard cases or let the final expression become the result.

method_return.rb

def shipping_cost(item_count)
  return 0 if item_count <= 0
  return 12 if item_count > 5

  item_count * 2
end

item_count = 
cost = shipping_cost(item_count)

puts "item_count=#{item_count}"
puts "cost=#{cost}"

def shipping_cost(item_count)
  return 0 if item_count <= 0
  return 12 if item_count > 5

  item_count * 2
end

item_count = 
cost = shipping_cost(item_count)

puts "item_count=#{item_count}"
puts "cost=#{cost}"

def shipping_cost(item_count)
  return 0 if item_count <= 0
  return 12 if item_count > 5

  item_count * 2
end

item_count = 
cost = shipping_cost(item_count)

puts "item_count=#{item_count}"
puts "cost=#{cost}"

method return An explicit `return` exits the method immediately; otherwise Ruby returns the final expression.