Add all the A tasks

Task/Add-a-variable-to-a-class-instance-at-runtime/Scala/add-a-variable-to-a-class-instance-at-runtime-1.scala

@@ -0,0 +1,12 @@
+import language.dynamics
+import scala.collection.mutable.HashMap
+
+class A extends Dynamic {
+  private val map = new HashMap[String, Any]
+  def selectDynamic(name: String): Any = {
+    return map(name)
+  }
+  def updateDynamic(name:String)(value: Any) = {
+    map(name) = value
+  }
+}

Task/Add-a-variable-to-a-class-instance-at-runtime/Scala/add-a-variable-to-a-class-instance-at-runtime-2.scala

@@ -0,0 +1,8 @@
+scala> val a = new A
+a: A = A@7b20f29d
+
+scala> a.foo = 42
+a.foo: Any = 42
+
+scala> a.foo
+res10: Any = 42