diff --git a/src/ol/base/attribution.js b/src/ol/base/attribution.js
index 7363b82c9c..acf59930e3 100644
--- a/src/ol/base/attribution.js
+++ b/src/ol/base/attribution.js
@@ -23,14 +23,13 @@ ol.Attribution = function(html, opt_coverageAreas, opt_projection) {
    * @private
    * @type {Array.<ol.CoverageArea>}
    */
-  this.coverageAreas_ =
-      goog.isDef(opt_coverageAreas) ? opt_coverageAreas : null;
+  this.coverageAreas_ = opt_coverageAreas || null;
 
   /**
    * @private
    * @type {ol.Projection}
    */
-  this.projection_ = goog.isDef(opt_projection) ? opt_projection : null;
+  this.projection_ = opt_projection || null;
 
 };
 
diff --git a/src/ol/base/collection.js b/src/ol/base/collection.js
index 2810e3a492..bec2f650c3 100644
--- a/src/ol/base/collection.js
+++ b/src/ol/base/collection.js
@@ -82,7 +82,7 @@ ol.Collection = function(opt_array) {
    * @private
    * @type {Array}
    */
-  this.array_ = goog.isDefAndNotNull(opt_array) ? opt_array : [];
+  this.array_ = opt_array || [];
 
   this.updateLength_();
 
diff --git a/src/ol/base/color.js b/src/ol/base/color.js
index 0792334ce4..43e8e0c17f 100644
--- a/src/ol/base/color.js
+++ b/src/ol/base/color.js
@@ -43,7 +43,7 @@ ol.Color = function(r, g, b, a) {
  */
 ol.Color.createFromString = function(str, opt_a) {
   var rgb = goog.color.hexToRgb(goog.color.parse(str).hex);
-  var a = goog.isDef(opt_a) ? opt_a : 255;
+  var a = opt_a || 255;
   return new ol.Color(rgb[0], rgb[1], rgb[2], a);
 };
 
diff --git a/src/ol/base/map.js b/src/ol/base/map.js
index 3ad7433d5f..b1a44eeb38 100644
--- a/src/ol/base/map.js
+++ b/src/ol/base/map.js
@@ -189,8 +189,8 @@ ol.Map = function(target, opt_values, opt_viewportSizeMonitor) {
    * @private
    * @type {goog.dom.ViewportSizeMonitor}
    */
-  this.viewportSizeMonitor_ = goog.isDef(opt_viewportSizeMonitor) ?
-      opt_viewportSizeMonitor : new goog.dom.ViewportSizeMonitor();
+  this.viewportSizeMonitor_ =
+      opt_viewportSizeMonitor || new goog.dom.ViewportSizeMonitor();
 
   goog.events.listen(this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
       this.handleViewportResize, false, this);
@@ -580,7 +580,7 @@ ol.Map.prototype.handleBackgroundColorChanged = goog.nullFunction;
  * @param {string=} opt_type Type.
  */
 ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
-  var type = goog.isDef(opt_type) ? opt_type : browserEvent.type;
+  var type = opt_type || browserEvent.type;
   var mapBrowserEvent = new ol.MapBrowserEvent(type, this, browserEvent);
   var controls = this.getControls();
   var controlsArray = /** @type {Array.<ol.Control>} */ controls.getArray();
diff --git a/src/ol/base/object.js b/src/ol/base/object.js
index 7567df288e..6518c89b83 100644
--- a/src/ol/base/object.js
+++ b/src/ol/base/object.js
@@ -157,7 +157,7 @@ ol.Object.getListeners = function(obj) {
  */
 ol.Object.prototype.bindTo =
     function(key, target, opt_targetKey, opt_noNotify) {
-  var targetKey = goog.isDef(opt_targetKey) ? opt_targetKey : key;
+  var targetKey = opt_targetKey || key;
   this.unbind(key);
   var eventType = ol.Object.getChangedEventType(targetKey);
   var listeners = ol.Object.getListeners(this);
@@ -166,7 +166,7 @@ ol.Object.prototype.bindTo =
   }, undefined, this);
   var accessors = ol.Object.getAccessors(this);
   accessors[key] = {target: target, key: targetKey};
-  var noNotify = goog.isDef(opt_noNotify) ? opt_noNotify : false;
+  var noNotify = opt_noNotify || false;
   if (!noNotify) {
     this.notifyInternal_(key);
   }
diff --git a/src/ol/base/store.js b/src/ol/base/store.js
index bd7b6469ce..1bc9912a3e 100644
--- a/src/ol/base/store.js
+++ b/src/ol/base/store.js
@@ -25,13 +25,13 @@ ol.Store = function(projection, opt_extent, opt_attributions) {
    * @private
    * @type {ol.Extent}
    */
-  this.extent_ = goog.isDef(opt_extent) ? opt_extent : projection.getExtent();
+  this.extent_ = opt_extent || projection.getExtent();
 
   /**
    * @private
    * @type {Array.<ol.Attribution>}
    */
-  this.attributions_ = goog.isDef(opt_attributions) ? opt_attributions : null;
+  this.attributions_ = opt_attributions || null;
 
 };
 
diff --git a/src/ol/tile/bingmaps.js b/src/ol/tile/bingmaps.js
index 100603bdcf..0d282f2065 100644
--- a/src/ol/tile/bingmaps.js
+++ b/src/ol/tile/bingmaps.js
@@ -59,7 +59,7 @@ ol.tilestore.BingMaps =
    * @private
    * @type {string}
    */
-  this.culture_ = goog.isDef(opt_culture) ? opt_culture : 'en-us';
+  this.culture_ = opt_culture || 'en-us';
 
   /**
    * @private
@@ -71,7 +71,7 @@ ol.tilestore.BingMaps =
    * @private
    * @type {?function(ol.tilestore.BingMaps)}
    */
-  this.callback_ = goog.isDef(opt_callback) ? opt_callback : null;
+  this.callback_ = opt_callback || null;
 
   /**
    * @private
diff --git a/src/ol/tile/tilegrid.js b/src/ol/tile/tilegrid.js
index c563b19154..4fea740353 100644
--- a/src/ol/tile/tilegrid.js
+++ b/src/ol/tile/tilegrid.js
@@ -69,8 +69,7 @@ ol.TileGrid = function(resolutions, extent, origin, opt_tileSize) {
    * @private
    * @type {ol.Size}
    */
-  this.tileSize_ = goog.isDef(opt_tileSize) ?
-      opt_tileSize : new ol.Size(256, 256);
+  this.tileSize_ = opt_tileSize || new ol.Size(256, 256);
 
 };
 
diff --git a/src/ol/tile/tilejson.js b/src/ol/tile/tilejson.js
index 9f61859342..1b6a17ea1f 100644
--- a/src/ol/tile/tilejson.js
+++ b/src/ol/tile/tilejson.js
@@ -71,7 +71,7 @@ ol.tilestore.TileJSON = function(uri, opt_callback, opt_obj) {
    * @private
    * @type {?function(ol.tilestore.TileJSON)}
    */
-  this.callback_ = goog.isDef(opt_callback) ? opt_callback : null;
+  this.callback_ = opt_callback || null;
 
   /**
    * @private
diff --git a/src/ol/tile/tilestore.js b/src/ol/tile/tilestore.js
index 4eb19346a1..9f9b1ba522 100644
--- a/src/ol/tile/tilestore.js
+++ b/src/ol/tile/tilestore.js
@@ -40,8 +40,7 @@ ol.TileStore = function(projection, tileGrid, tileUrlFunction, opt_extent,
    * @private
    * @type {?string}
    */
-  this.crossOrigin_ =
-      goog.isDef(opt_crossOrigin) ? opt_crossOrigin : 'anonymous';
+  this.crossOrigin_ = opt_crossOrigin || 'anonymous';
 
   /**
    * @private