Flow & Array

array.rb

beatles = ["john", "ringo", "seb"]
#index       0       1        2 (length - 1)
#index      -3      -2       -1

p beatles # puts beatles.inspect


# C R U D

# Create
beatles << "marco"
# beatles.insert(1, "marco")
p beatles

# Read
beatles[0]

# Update
beatles[2] = "george"
p beatles

# Delete
beatles.delete_at(3)
beatles.delete("george")

p beatles

even_or_odd.rb

puts "Insert a number"
num = gets.chomp.to_i

condition ? true : false_part

puts num.even? ? "Even" : "Odd"

game.rb

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

puts "what's your guess"
user = gets.chomp.downcase

# if user == computer
#   puts "you win"
# else
#   puts "you lose"
# end

message = user == computer ? "you win" : "you lose"
puts message

greeting.rb

puts "What time is it?"
hour = gets.chomp.to_i

if hour < 12
  puts "good morning"
elsif hour > 20
  puts"good evening"
elsif hour > 12
  puts "good afternoon"
end

interface.rb

puts "Insert action"
action = gets.chomp

# if action == "read"
#   puts "Entering read mode"
# elsif action == "write"
#   puts "Entering write mode"
# elsif action == "exit"
#   puts"Exit!"
# else
#   puts "Wrong input"
# end

case action
when "read"
  puts "Entering read mode"
  break
when "write"
  puts "Entering write mode"
when "exit"
  puts "Exit!"
else
  puts "Wrong"
end

open.rb

puts "What time is it?"
hour = gets.chomp.to_i

#           AND          OR            AND
# if hour > 9 && hour < 12 ||  hour > 15 && hour < 18
#   puts "Open!"
# end

is_morning = hour > 9 && hour < 12
is_afternoon = hour > 15 && hour < 18

if is_morning ||  is_afternoon
  puts "Open!"
end

vote.rb

# if condition
#   block
# end

puts "What's yor age?"
age = gets.chomp.to_i

if age >= 18
  puts "you can vote"
else
  puts "you cannot vote"
end

# condition ? true_part : false_part

# result = age >= 18 ? "you can vote" : "you cannot vote"

puts result