Update docs and tests.

scripts/oop.rhai

@@ -1,45 +1,41 @@
-// This script simulates object-oriented programming (OOP) techniques
-// using function pointers (Fn) and object maps.
+// This script simulates object-oriented programming (OOP) techniques using closures.
+
+// External variable that will be captured.
+let last_value = ();
 
 // Define object
 let obj1 = #{
-    _data: 42,                      // data field
-    get_data: Fn("getData"),        // property getter
-    action: Fn("action"),           // method
-    update: Fn("update1")           // property setter
+    _data: 42,                                  // data field
+    get_data: || this._data,                    // property getter
+    action: || print("Data=" + this._data),     // method
+    update: |x| {                               // property setter
+        this._data = x;
+        last_value = this._data;                // capture 'last_value'
+        this.action();
+    }
 };
 
-fn getData() {
-    this._data
-}
-fn action() {
-    print("Data=" + this._data);
-}
-fn update1(x) {
-    this._data = x;
-    this.action();
-}
-
-if obj1.get_data() > 0 {            // property access
-    obj1.update(123);               // call method
+if obj1.get_data() > 0 {                        // property access
+    obj1.update(123);                           // call method
 } else {
     print("we have a problem here");
 }
 
 // Define another object based on the first object
 let obj2 = #{
-    _data: 0,                       // data field - new value
-    update: Fn("update2")           // property setter - another function
+    _data: 0,                                   // data field - new value
+    update: |x| {                               // property setter - another function
+        this._data = x * 2;
+        last_value = this._data;                // capture 'last_value'
+        this.action();
+    }
 };
-obj2.fill_with(obj1);               // add all other fields from obj1
+obj2.fill_with(obj1);                           // add all other fields from obj1
 
-fn update2(x) {
-    this._data = x * 2;
-    this.action();
-}
-
-if obj2.get_data() > 0 {            // property access
-    obj2.update(0);                 // call method
+if obj2.get_data() > 0 {                        // property access
+    print("we have another problem here");
 } else {
-    obj2.update(42);                // call method
+    obj2.update(42);                            // call method
 }
+
+print("Should be 84: " + last_value);