proc_in_case.rb

# this works, because `proc === x` is same as `proc.call(x)`
# weird syntactic choice makes a great job in case statements

def say_something_about(number)
  greater_then_10 = -> (number) { number > 10 }
  equals_15 = -> (number) { number === 15 }
  
  case number
  when greater_then_10
    puts "it's greater then 10!"
  when equals_15
    puts "it equals 15!"
  else
    puts "it's #{number}"
  end
end

say_something_about 0