chore(functionTween): breaked tests, but we fixed

fix(check): in-start check for best performance

Author: dalisoft

rollup.config.js

@@ -5,7 +5,7 @@ import { minify } from 'uglify-js-harmony'
 const { BUILD } = process.env
 
 const plugins = [ buble({
-	objectAssign: 'Object.assign'
+  objectAssign: 'Object.assign'
 }) ]
 
 let moduleName = 'Tween'

src/dist/Tween.js

@@ -233,11 +233,11 @@ class Tween {
 
             this._startTime = _startTime;
 
-            for (let property in _valuesEnd) {
+			if (typeof _valuesEnd === "object") {
 
-				property = object[+property] !== undefined ? +property : property;
+            for (let property in _valuesEnd) {
 
-                if (typeof _valuesEnd[property] === "object") {
+                if (typeof _valuesEnd[property] === "object" && _valuesEnd[property]) {
 
                     this._valuesEnd[property] = SubTween(object[property], _valuesEnd[property]);
 
@@ -269,6 +269,8 @@ class Tween {
 
             }
 
+			}
+
             add(this);
 
             this._isPlaying = true;
@@ -452,7 +454,7 @@ class Tween {
                     if (typeof(end) === 'number') {
                         object[property] = start + (end - start) * value;
                     }
-                } else if (typeof(end) === 'number') {
+                } else if (typeof(start) === 'number') {
                     object[property] = start + (end - start) * value;
                 }
 

test/unit/tests.js

@@ -216,7 +216,7 @@
         var obj = { x: true },
           t = new TWEEN.Tween(obj)
 
-        t.to({ x: function () {} })
+        t.to({ x: false })
         t.start(0)
         t.update(1000)