Cons, car and cdr in Ruby

cons-if.rb

def cons a, b
  lambda { |pick|
    return a if pick == 1
    return b if pick == 2
  }
end

def car cons
  cons.call 1
end

def cdr cons
  cons.call 2
end

cons-lambda.rb

def cons a, b
  lambda { |m| m.call a,b }
end

def car cons
  cons.call lambda { |a,b| a }
end

def cdr cons
  cons.call lambda { |a,b| b }
end