flow_control.rb

age = 5

wishes = (age * "happy " + "Birthday!").capitalize

puts wishes

puts "HI GUYS"

puts "10 times 10 is #{10 * 10}"

num = 50 * 5 # assignment operator evaluate right side

puts "NUMMMMM: #{num}"


# objects
# methods

# string = "pizza"
# string[0]
# string.[](0)

# Keywords
# def
# if
# else
# end
# class

# "Truthiness" -- any object besides nil and false
# is treated as "truthy"

# nil and false are treated as "Falsey"

# want to choose between two things
# one side or the other but not both
condition = false
if condition
  puts "CONDITION IS TRU-thy!"
  # body of one branch
else
  # body of the other branch
  puts "CONDITION IS FALSE-y"
end


# branch between multiple choices


condition_one = false
condition_two = true
condition_three = true

# Choose first branch for which the condition
# holds true
if condition_one
  puts "FIRST CONDITION"
elsif condition_two
  puts "SECOND CONDITION"
elsif condition_three
  puts "THIRD CONDITION"
else
  puts "LAST CONDITION"
end


condition = false

if condition
  puts "CONDITION IS TRUE"
else
  nil
end


condition_one = false
condition_two = true
condition_three = true

# Choose first branch for which the condition
# holds true
if condition_one
  puts "FIRST CONDITION"
elsif condition_two
  puts "SECOND CONDITION"
elsif condition_three
  puts "THIRD CONDITION"
else
  "Sorry, input not understood."
end

# Negating conditions

condition = true
unless condition
  "do this only if the condition is false-y"
end

if !condition
  "do this if the condition is false-y"
end



# Flow Control tools
# Do a thing multiple times

# until : while :: unless : if

# while
# until
# for
# loop
# times method on integers


# while true
#   puts "repeat this as long as the condition is truth-y"
# end

loop do
  puts "repeat this forever"
end

some_variable = counter < 2

# do some series of steps
# X number of times
counter = 0
# if the condition is false-y, your loop
# won't even execute once
while counter < 2
  puts "my message! #{counter}"
  counter += 1 # only increment the counter under certain conditions, etc
end

until (counter < 2)
  puts "my message! #{counter}"
  # do these things
end

# "times" method
# -- call this on any Number
5.times do
  # want to know which iteration i'm
  puts "Doing stuff 5 times"
end


6.times do |i| # <-- block variable
  # within this block can use "i"
  # to refer to the number of the current iteration
  puts i
end