gettres and setters - Object.defineProperty

githubdmn · githubdmn · commit fea883d87d5f · 2023-06-20T09:39:28.000+02:00
diff --git a/src/02-oop/17-getters-setters.js b/src/02-oop/17-getters-setters.js
@@ -0,0 +1,62 @@
+console.log('Getters and setters');
+
+function Circle(radius) {
+  this.radius = radius;
+  let start = { x: 0, y: 0 };
+  let compute = function (factor) {
+    console.log('Factor: ', factor);
+  };
+  this.draw = function () {
+    compute(0.1);
+    console.log('draw');
+  };
+  this.getStart = function () {
+    return start;
+  };
+}
+
+const c = new Circle(2);
+c.draw();
+console.log(c.getStart(), '\n');
+
+function CircleB(radius) {
+  this.radius = radius;
+  let start = { x: 0, y: 0 };
+  this.draw = function () {
+    console.log('draw');
+  };
+  Object.defineProperty(this, 'start', {
+    get: function () {
+      return start;
+    },
+  });
+}
+
+const cb = new CircleB(2);
+cb.draw();
+console.log('Object.defineProperty -> get \n', cb.start, '\n');
+
+function CircleC(radius) {
+  this.radius = radius;
+  let start = { x: 0, y: 0 };
+  this.draw = function () {
+    console.log('draw');
+  };
+  Object.defineProperty(this, 'start', {
+    get: function () {
+      return start;
+    },
+    set: function (value) {
+      if (!value.x && !value.y) throw new Error('Invalid location');
+      start: value;
+    },
+  });
+}
+
+const cc = new CircleC(2);
+cc.draw();
+console.log('Object.defineProperty -> get / set \n', cc.start, '\n');
+// cc.start =  3; // reports an error
+cc.start.x = 5;
+cc.start.y = 3;
+console.log(cc.start);
diff --git a/src/02-oop/index.js b/src/02-oop/index.js
@@ -8,5 +8,6 @@ const runFile11 = './11-fn-are-objects';
 const runFile13 = './13-object-properties';
 const runFile14 = './14-enumerating-properties';
 const runFile16 = './16-private-properties-methods';
+const runFile17 = './17-getters-setters';
 
-require(runFile16);
+require(runFile17);
