Create an object/Native demonstration: Difference between revisions

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@@ Line 1,251: / Line 1,251: @@
     [key] { _map[key] }
-    [key] =(value) { _map[key] = value }
+    [key] =(value) {
+        // do nothing if key doesn't already exist
+        if (_map[key] != null) _map[key] = value
+    }
     reset(key) {
         var t = _map[key].type
+        // leave unaltered if no suitable default value
         _map[key] = (t == Num)    ? 0 :
                     (t == String) ? "":
                     (t == Bool)   ? false :
                     (t == List)   ? [] :
-                    (t == Map)    ? {} : Fiber.abort("No suitable default value for type %(t)")
+                    (t == Map)    ? {} : _map[key]
     }
     iterate(iterator)       { _map.iterate(iterator) }
@@ Line 1,288: / Line 1,292: @@
 {b: 4, a: 3}
 false
+{b: 4, a: 3}
 {b: 4, a: 0}
 [b, a]