array.rb

# DEEFINE AN ARRAY
empty_array = []  # an empty array
beatles = ["john", "paul", "ben"] # an array of 3 elements

# GET ELEMENT BY ITS INDEX
beatles[0]  # => "john"
beatles[1]  # => "paul"
beatles[2]  # => "ben"

# MODIFY AN ELEMENT
beatles[2] = "fish"
p beatles # => ["john", "paul", "fish"]

# ADD ELEMENT TO ARRAY
beatles << "ringo"
p beatles # => ["john", "paul", "fish", "ringo"]

# DELETE ELEMENT
#BY ELEMENT
beatles.delete("john")
#BY INDEX
beatles.delete_at(2)

#LOOP ON ELEMENTS
beatles.each do |beatle|
  puts "#{beatle.upcase}"
end

for_loop.rb

nums = (0...10).to_a

for num in nums
  puts num
end

hour.rb

puts "What time? (hour)"
print "> "

hour = gets.chomp.to_i

if hour <= 12
  puts "Good morning"
elsif hour >= 20
  puts "Good evening"
else
  puts "Good afternoon"
end

old_school_ui.rb

puts "Which action [read|write|exit]"
print "> "

action = gets.chomp

# if action == "read"
#   puts "You're entering read mode"
# elsif action == "write"
#   puts "You're entering write mode"
# elsif action == "exit"
#   puts "Exit"
# end

case action
when "read"
  puts "You're entering read mode"
when "write"
  puts "You're entering write mode"
when "exit"
  puts "exit"
end

price_to_find.rb

price_to_find = rand(5)

choice = nil

while choice != price_to_find
  puts "Choose a number between 0 and 4"
  print "> "
  choice = gets.chomp.to_i
end

puts "You guess, it was #{price_to_find}"

recap.rb

# *ASSIGN* the value 28 to the variable age
age = 28

# RE-ASSIGN the value 29 to the variable age
age = 29

# VARIABLE INCREMENTATION
age = age + 1
age += 1

# VARIABLE DECREMENTATION
age = age - 1
age -= 1

# METHOD
def method_name(age)
  # code here
end

store.rb

puts "What hour?"
print "> "

hour = gets.chomp.to_i

if (hour > 8 && hour <= 12) || (hour > 14 && hour < 18)
  puts "Open for business"
else
  puts "Close"
end

ternary.rb

puts "heads or tails?"
print "> "

user_choice = gets.chomp

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

# if user_choice == computer_choice
#   verb = "win"
# else
#   verb = "suck"
# end

verb = user_choice == computer_choice ? "win" : "lost"

puts "You #{verb}"

vote.rb

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

age = gets.chomp.to_i

if age >= 18
  puts "You can vote"
else
  puts "You can't vote"
end