Data commit

Task/Stack/Groovy/stack.groovy

@@ -0,0 +1,37 @@
+def stack = []
+assert stack.empty
+
+stack.push(55)
+stack.push(21)
+stack.push('kittens')
+assert stack.last() == 'kittens'
+assert stack.size() == 3
+assert ! stack.empty
+
+println stack
+
+assert stack.pop() == "kittens"
+assert stack.size() == 2
+
+println stack
+
+stack.push(-20)
+
+println stack
+
+stack.push( stack.pop() * stack.pop() )
+assert stack.last() == -420
+assert stack.size() == 2
+
+println stack
+
+stack.push(stack.pop() / stack.pop())
+assert stack.size() == 1
+
+println stack
+
+println stack.pop()
+assert stack.size() == 0
+assert stack.empty
+
+try { stack.pop() } catch (NoSuchElementException e) { println e.message }