Exercises from Flow & Arrays lecture

beatles.rb

# Define an array
beatles = ["john", "ringo", "seb"]
#             0       1       2

# Read an element
beatles[1]

# Modify an element
beatles[2] = "george"

# Create an element
beatles << "paul"
beatles.push("paul")

# Delete
beatles.delete("paul")
beatles.delete_at(1)

# Create:   << / push
# Read:     [index]
# Update:   [index] =
# Delete:   delete/ delete_at

beatles.each do |beatle|
  puts "#{beatle.capitalize} is a Beatle!"
end

beatles << 3
joined_beatles = beatles.join(":") # returns a string
joined_beatles.split(":") # returns an array

beatles.length # /count/size 

coin_flip.rb

puts "heads or tails?"
puts ">"

player_choice = gets.chomp

computer_choice = ["heads", "tails"].sample

# if player_choice == computer_choice
#   result = "win"
# else
#   result = "lose"
# end

# condition ? code_if_truthy : code_if_falsy

result = player_choice == computer_choice ? "win" : "lose"




puts "You #{result}, the coin was #{computer_choice}"

old_ui.rb

puts "What do you want to do? [read|write|exit]"
puts ">"

choice = gets.chomp

# if choice == "write"
#   puts "Entering write mode"
# elsif choice == "read"
#   puts "Entering read mode"
# elsif choice == "exit"
#   puts "Bye bye!"
# else
#   puts "wrong choice!"
# end

case choice
when "write"  then puts "Entering write mode"
when "read"   then puts "Entering read mode"
when "exit"   then puts "Bye bye!"
else
  puts "wrong choice!"
end

price_is_right.rb

price = rand(5) # 0 and 4
guess = nil


until price == guess
  puts "Guess the price"
  guess = gets.chomp.to_i
end

puts "You won! The price was £#{price}"

shop.rb

# hour = Time.now.hour

puts "what's the time"
hour =gets.chomp.to_i

is_morning = (hour >= 9 && hour < 12)
is_afternoon = (hour > 14 && hour < 16)

if is_morning || is_afternoon
  puts "Shop is open!"
else
  puts "Shop is closed!"
end

time_of_day.rb

puts "What's the time? (hour)"
puts ">"

hour = gets.chomp.to_i

if hour < 12
  puts "Good morning!"
elsif hour > 18
  puts "Good evening - pub time!"
elsif hour > 12
  puts "Good afternoon"
else
  puts "Lunch time!"
end

# more specific conditions go higher!

vote.rb

puts "How old are you?"
puts ">"

age = gets.chomp.to_i

condition = (age >= 18)

if condition
  puts "You can vote!"
else
  puts "You can't vote"
end

# puts "You can vote!" unless !condition