calculator.rb

# TODO: you can build your calculator program here!
# create a calculator
require 'colorize'

def prompt(text)
  puts text.yellow
end

def addition(first, last)
  first + second
end

# welcome
puts "Welcome math buddy -- I am your friend"
# write prompt to the terminal
# puts "Enter your first number".yellow
prompt("Enter your first number")
# enter first number --> save to variable
first = gets.chomp.to_i
# write prompt to the terminal
prompt("Enter your second number")
# prompt(text)
# enter second number --> save to variable
second = gets.chomp.to_i
# ask the user for the operation
prompt("Enter the operator [+|-|*|/]")
# choose the operation --> save to variable
operation = gets.chomp

case operation
when "+" then answer = first + second
when "-" then answer = first - second
when "*" then answer = first * second
when "/" then answer = first.fdiv(second)
else
  answer = "Wrong input, please try again"
end

puts "Your answer is #{answer}".green

horse_racing.rb

# I accidentally deleted our livecode, so this is the LeWagon solution :)

# Define the horses
horses = ["Joe the Brave", "Black Stalion", "Ronny the Rat", "Tony Macaroni"]

# Define the initial user balance
balance = 100

# Display a welcome message
puts "Welcome to the horse race!"
puts "--------------------------"

# Start the loop
# Condition to loop: the user has at least 10 in his balance
while balance >= 10

  # Display the names of the horses that are running, with a number starting from 1
  puts "---------------------"
  puts "Today our horses are:"
  horses.each_with_index do |horse, index|
    puts "#{index + 1} - #{horse}"
  end

  # Ask the user which horse he wants to bet on
  puts "Which horse do you want to bet on?"
  print "> "

  # Shift the user choice by -1 to get his horse index
  user_horse_index = gets.chomp.to_i - 1

  # Display the name of the horse that the user bet on
  puts "You chose: #{horses[user_horse_index]}"

  # Run the race: randomly select the winner horse index
  winner_horse_index = rand(0...horses.length)

  # Compute the result: compare the index of the horse of the user with the winner horse index
  if user_horse_index == winner_horse_index

    # If the user won, add 50 to his balance and display the winning message
    balance += 50
    puts "You won! Your balance is now #{balance}€"
  else

    # If the user lost, substract 10 to his balance and display the losing message
    balance -= 10
    puts "You lost! The winner was #{horses[winner_horse_index]} Your balance is now #{balance}€"
  end
end

# Display an exit message
puts "-----------------------------------------"
puts "Thank you for playing! See you next time!"

instacart.rb

require 'pry'

# display Welcome message
puts "--------------------"
puts "Welcome to Instacart"
puts "--------------------"

# define stock = An array of hashes (each item)
store_items = {
  "kiwi": {price: 1.25, qty: 2},
  "banana": {price: 1.25, qty: 5},
  "mango": {price: 1.25, qty: 10},
  "asparagus": {price: 1.25, qty: 4}
}

shopping_cart = Hash.new(0)
# eg format - {"kiwi": 1}
# so we can access like so shopping_cart["kiwi"]

answer = nil

puts "In our store today:"
store_items.each do |key, value|
  puts "#{key} - $#{value[:price]} - #{value[:qty]} available"
end
puts "--------------------"

until answer == "exit"
  puts "Which item? (or 'exit' to checkout)"
  answer = gets.chomp

  puts "How many would you like to buy?"
  qty = gets.chomp

  # byebug
  if store_items[answer.to_sym][:qty] < qty.to_i
    puts "there are not enough in the store"
  elsif store_items[answer.to_sym]
    shopping_cart[answer] += qty.to_i
    store_items[answer.to_sym][:qty] -= qty.to_i
    # update store
  elsif answer == "exit"
  else
    puts "You have chosen an item not in our store"
  end

  p shopping_cart
  puts ""
  p store_items
end