[Reboot] Instacart

interface.rb

# 1) print "Welcome to the Instacart"
# 2) Define the items on the store (Hashes)
# 3) Initialize an empty cart
# 3) Print the items
# 4) Ask the user for one item until he types "quit"
# 5) If the item is not on store, do something
# 8) if user types "quit", then Display the order (BILL)
# 9) Checkout.

# Our items on store
items = {
	"apple" 	=> 1.40,
	"kiwi" 		=> 2.00,
	"orange" 	=> 1.50,
	"watermelon" => 6.00
}

# Just pretty printing using LJUST (applies some spaces or leading zeros if you want)
items.each do |key, value|
	puts "- #{key.ljust(20)} -------- $#{value}"
end


# My empty shop cart
cart = []

# Default command when the program starts
user_choice = nil

# We run until the user types quit
until user_choice == "quit"

	puts "Which item do you want to add? (type 'quit' to checkout)"
	# kiwi, orange
	user_choice = gets.chomp

	# .keys => [Array of Keys]
	# ["kiwi", "orange", "apples"].include?("kiwi")
	if items.keys.include?(user_choice)

		# if user_choice == "kiwi"
		# items["kiwi"] => 2.0
		cart << items[user_choice]
	end

end


# Print the checkout
# Check the documentation for REDUCE
# It reduce the enumeration (array in this case) to a common element, applying binary operations 
# (we are summing everyone in the array, returning only the result of this sum, ok?
puts "The Bill is $#{cart.reduce(:+)}"





# -------------- END of script ------------- #


# puts 'Item' + ''.ljust(18) + '| Cost' + "\n\n"
# items.each do |key, value|
# 	puts "- #{key.ljust(20)}| $#{value}"
# end

# Fetch gets the VALUE of the key if he founds it
# Otherwise, he returns false.
# items.fetch("Kiwi", false) # Fetch => 2.00