def distance_between(obj1, obj2)
  a = obj1.x - obj2.x
  b = obj1.y - obj2.y
  Math.hypot(a, b)
end

struct Vector2
  property x = 0
  property y = 0

  def initialize(@x : Int32, @y : Int32)
  end
end

a = Vector2.new(100, 100)
b = Vector2.new(100, 100)

# fake game loop
loop do
  distance_between(a, b)
  sleep 0 # 100 CPU USAGE!
end

puts "Started..."