My first remote interwiev :)

gistfile1.txt

#a = *(0..10)

#a.delete((rand * 10).to_i)
#z=0

#a.each_with_index do |thing, index|
   
#  if thing != index
#    p index 
#    break
#  end
   
#end

#p a

# x,y - исход матча
# a,b - ставка
def pay(x, y, a, b)
  if (x == a) && (y == b)
    2
  elsif (((x > y) && (a > b)) || ((x < y) && (a < b)) || ((x == y) && (a == b)))
    1
  else 
    0
  end
end

p pay(1, 4, 1, 4) == 2
p pay(1, 4, 2, 4) == 1
p pay(1, 4, 5, 3) == 0
p pay(2, 2, 3, 3) == 1
p pay(3, 3, 3, 3) == 2
p pay(4, 3, 1, 2) == 0
p pay(5, 3, 2, 1) == 1

class A
  def self.foo(o)
    o.bar
  end
end

class B 
  def bar
    "BAR"
  end
end

class C 
  def bar
    "BAR C"
  end
end

p A.foo(B.new)
p A.foo(C.new)

gistfile2.txt

http://ru.wikipedia.org/wiki/SOLID_(%D0%BE%D0%B1%D1%8A%D0%B5%D0%BA%D1%82%D0%BD%D0%BE-%D0%BE%D1%80%D0%B8%D0%B5%D0%BD%D1%82%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D0%BE%D0%B5_%D0%BF%D1%80%D0%BE%D0%B3%D1%80%D0%B0%D0%BC%D0%BC%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5)

https://github.com/pluginaweek/state_machine

https://coderpad.io