Add ol.Collection.extend

src/ol/collection.js

@@ -99,6 +99,17 @@ ol.Collection.prototype.clear = function() {
 };
 
 
+/**
+ * @param {Array} arr Array.
+ */
+ol.Collection.prototype.extend = function(arr) {
+  var i;
+  for (i = 0; i < arr.length; ++i) {
+    this.push(arr[i]);
+  }
+};
+
+
 /**
  * @param {Function} f Function.
  * @param {Object=} opt_obj Object.

test/spec/ol/collection.test.js

@@ -235,6 +235,17 @@ describe('ol.collection', function() {
       });
     });
   });
+
+  describe('extending a collection', function() {
+    it('adds elements to end of the collection', function() {
+      collection.extend([1, 2]);
+      expect(collection.getLength()).toEqual(2);
+      expect(goog.array.equals(collection.getArray(), [1, 2])).toBeTruthy();
+      expect(collection.getAt(0)).toEqual(1);
+      expect(collection.getAt(1)).toEqual(2);
+    });
+  });
+
 });
 
 goog.require('goog.array');