all tasks

Task/Stack/Scala/stack.scala

@@ -0,0 +1,18 @@
+class Stack[T]
+{
+   private var items=List[T]()
+	
+   def isEmpty=items.isEmpty
+
+   def peek=items match{
+      case List() => error("Stack empty")
+      case head::rest => head
+   }
+
+   def pop=items match{
+      case List() => error("Stack empty")
+      case head::rest => items=rest; head
+   }
+
+   def push(value:T)=items=value+:items
+}