Add a variable to a class instance at runtime: Difference between revisions

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@@ Line 279: / Line 279: @@
 =={{header|Elena}}==
-ELENA does not support adding a variable at run-time but it can be simulated with the help of a group object
+ELENA does not support adding a field at run-time but it can be simulated with the help of a group object
-<lang elena>#subject foo.
+<lang elena>#define system.
-#class FieldContainer
+#class Extender
 {
-    #field theValue.
+    #field theObject.
+    #field theField.
-    #method foo'set : anObject
+    #constructor new : anObject
     [
-        theValue := anObject.
+        theObject := anObject.
     ]
-    #method foo'get = theValue.
+    #method foo = theField.
+    #method set &foo : aValue
+    [
+        theField := aValue.
+    ]
+    #method => theObject.
 }
-#symbol Program =
+#symbol program =
 [
     #var anObject := 234.
     // adding a field
-    anObject := anObject &= FieldContainer.
+    anObject := Extender new:anObject.
-    anObject foo'set:"bar".
+    anObject set &foo:"bar".
-    'program'Output << anObject << ".foo=" << anObject foo.
+    console << anObject << ".foo=" << anObject foo.
-    'program'input get.
+    console readChar.
 ].</lang>