Remove ES6 code to fix old browser compatibility

src/modules/adapter.js

@@ -37,7 +37,7 @@ class Adapter {
       throw error;
     }
 
-    Object.assign(adapterOnScope, this.publicContext);
+    angular.extend(adapterOnScope, this.publicContext);
     this.publicContext = adapterOnScope;
   }
 
@@ -130,7 +130,7 @@ class Adapter {
     }
     // out-of-buffer case: deletion may affect Paddings
     else if(index >= this.buffer.getAbsMinIndex() && index <= this.buffer.getAbsMaxIndex()) {
-      if(Array.isArray(newItems) && !newItems.length) {
+      if(angular.isArray(newItems) && !newItems.length) {
         this.viewport.removeCacheItem(index, index === this.buffer.minIndex);
         if(index === this.buffer.getAbsMinIndex()) {
           this.buffer.incrementMinIndex();
@@ -143,7 +143,7 @@ class Adapter {
   }
 
   applyUpdate(wrapper, newItems) {
-    if (!Array.isArray(newItems)) {
+    if (!angular.isArray(newItems)) {
       return;
     }
     let position = this.buffer.indexOf(wrapper);
@@ -200,4 +200,4 @@ class Adapter {
 
 }
 
-export default Adapter;
+export default Adapter;

src/modules/buffer.js

@@ -1,7 +1,7 @@
 export default function ScrollBuffer(elementRoutines, bufferSize, startIndex) {
   const buffer = Object.create(Array.prototype);
 
-  Object.assign(buffer, {
+  angular.extend(buffer, {
     size: bufferSize,
 
     reset(startIndex) {
@@ -67,7 +67,7 @@ export default function ScrollBuffer(elementRoutines, bufferSize, startIndex) {
 
     // removes elements from buffer
     remove(arg1, arg2) {
-      if (Number.isInteger(arg1)) {
+      if (angular.isNumber(arg1)) {
         // removes items from arg1 (including) through arg2 (excluding)
         for (let i = arg1; i < arg2; i++) {
           elementRoutines.removeElement(buffer[i]);
@@ -151,4 +151,4 @@ export default function ScrollBuffer(elementRoutines, bufferSize, startIndex) {
   buffer.reset(startIndex);
 
   return buffer;
-}
+}

src/modules/jqLiteExtras.js

@@ -199,7 +199,7 @@ export default class JQLiteExtras {
         var self;
         self = this;
         if (typeof value !== 'undefined') {
-          if (Number.isInteger(value)) {
+          if (angular.isNumber(value)) {
             value = value + 'px';
           }
           return css.call(self, 'height', value);

src/modules/viewport.js

@@ -17,7 +17,7 @@ export default function Viewport(elementRoutines, buffer, element, viewportContr
     return viewport.outerHeight() * padding; // some extra space to initiate preload
   }
 
-  Object.assign(viewport, {
+  angular.extend(viewport, {
     getScope() {
       return scope;
     },

src/ui-scroll-grid.js

@@ -44,7 +44,7 @@ angular.module('ui.scroll.grid', [])
       // controller api methods
 
       this.applyLayout = function(layout) {
-        this.css = Object.assign({}, layout.css);
+        this.css = angular.extend({}, layout.css);
         this.mapTo = layout.mapTo;
         applyCss(this.header, this.css);
       };
@@ -158,7 +158,7 @@ angular.module('ui.scroll.grid', [])
         let result = [];
         columns.forEach((column, index) => result.push({
           index: index,
-          css: Object.assign({}, column.css),
+          css: angular.extend({}, column.css),
           mapTo: column.mapTo
         }));
         return result;

src/ui-scroll.js

@@ -110,9 +110,9 @@ angular.module('ui.scroll', [])
         function persistDatasourceIndex(datasource, propName) {
           let getter;
           // need to postpone min/maxIndexUser processing if the view is empty
-          if(Number.isInteger(datasource[propName])) {
+          if(angular.isNumber(datasource[propName])) {
             getter = datasource[propName];
-            if(Number.isInteger(getter)) {
+            if(angular.isNumber(getter)) {
               onRenderHandlers = onRenderHandlers.filter(handler => handler.id !== propName);
               onRenderHandlers.push({
                 id: propName,
@@ -502,4 +502,4 @@ angular.module('ui.scroll', [])
       }
 
     }
-  ]);
+  ]);