OOP support.

doc/src/language/object-maps-oop.md

@@ -0,0 +1,23 @@
+Special Support for OOP via Object Maps
+======================================
+
+{{#include ../links.md}}
+
+[Object maps] can be used to simulate object-oriented programming ([OOP]) by storing data
+as properties and methods as properties holding [function pointers].
+
+If an [object map]'s property holding a [function pointer] is called in method-call style,
+it calls the function referenced by the [function pointer].
+
+```rust
+fn do_action(x) { print(this + x); }        // 'this' binds to the object when called
+
+let obj = #{
+                data: 40,
+                action: Fn("do_action")     // 'action' holds a function pointer to 'do_action'
+           };
+
+obj.action(2);                              // prints 42
+
+obj.action.call(2);                         // <- the above de-sugars to this
+```