all tasks

Task/Stack/Ruby/stack-3.rb

@@ -0,0 +1,12 @@
+s = Stack.new
+s.empty?                           # => true
+s.pop                              # => nil
+s.pop(1)                           # => []
+s.push(1)                          # => Stack[1]
+s.push(2, 3)                       # => Stack[1, 2, 3]
+s.pop                              # => 3
+s.pop(1)                           # => [2]
+s.empty?                           # => false
+
+s = Stack[:a, :b, :c]
+s.pop                              # => :c