"Cookpad Daily Ruby Puzzles" in RubyKaigi 2019 - Extra Stage

README.md

Cookpad Daily Ruby Puzzles - Extra Stage

The Cookpad booth event in RubyKaigi 2019

See also the main problems (Day-1, Day-2, and Day-3)!

• extra-1.rb: authored by @mame
• extra-2.rb: authored by @mame
• extra-3.rb: authored by @ko1

extra-1.rb

Hello = "Hello"

# Hint: Stop the recursion.
def Hello
  Hello() +
    " world"
end

puts Hello()

extra-2.rb

s = ""
# Hint: https://techlife.cookpad.com/entry/2018/12/25/110240
s == s.upcase or
  s == s.downcase or puts "Hello world"

extra-3.rb

def say
  s = 'Small'
  t = 'world'
  puts "#{s} #{t}"
end

TracePoint.new(:line){|tp|
  tp.binding.local_variable_set(:s, 'Hello')
  tp.binding.local_variable_set(:t, 'Ruby')
  tp.disable
}.enable(target: method(:say))

say