diff --git a/src/ol/map.js b/src/ol/map.js
index f57a488922..98da3c3a3f 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -597,7 +597,7 @@ ol.Map.prototype.disposeInternal = function() {
  */
 ol.Map.prototype.forEachFeatureAtPixel =
     function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
-  if (goog.isNull(this.frameState_)) {
+  if (!this.frameState_) {
     return;
   }
   var coordinate = this.getCoordinateFromPixel(pixel);
@@ -635,7 +635,7 @@ ol.Map.prototype.forEachFeatureAtPixel =
  */
 ol.Map.prototype.forEachLayerAtPixel =
     function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
-  if (goog.isNull(this.frameState_)) {
+  if (!this.frameState_) {
     return;
   }
   var thisArg = opt_this !== undefined ? opt_this : null;
@@ -665,7 +665,7 @@ ol.Map.prototype.forEachLayerAtPixel =
  */
 ol.Map.prototype.hasFeatureAtPixel =
     function(pixel, opt_layerFilter, opt_this) {
-  if (goog.isNull(this.frameState_)) {
+  if (!this.frameState_) {
     return false;
   }
   var coordinate = this.getCoordinateFromPixel(pixel);
@@ -737,7 +737,7 @@ ol.Map.prototype.getTargetElement = function() {
  */
 ol.Map.prototype.getCoordinateFromPixel = function(pixel) {
   var frameState = this.frameState_;
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     return null;
   } else {
     var vec2 = pixel.slice();
@@ -812,7 +812,7 @@ ol.Map.prototype.getLayers = function() {
  */
 ol.Map.prototype.getPixelFromCoordinate = function(coordinate) {
   var frameState = this.frameState_;
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     return null;
   } else {
     var vec2 = coordinate.slice(0, 2);
@@ -899,7 +899,7 @@ ol.Map.prototype.getTilePriority =
   // Filter out tiles at higher zoom levels than the current zoom level, or that
   // are outside the visible extent.
   var frameState = this.frameState_;
-  if (goog.isNull(frameState) || !(tileSourceKey in frameState.wantedTiles)) {
+  if (!frameState || !(tileSourceKey in frameState.wantedTiles)) {
     return ol.structs.PriorityQueue.DROP;
   }
   var coordKey = ol.tilecoord.toString(tile.tileCoord);
@@ -934,7 +934,7 @@ ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
  * @param {ol.MapBrowserEvent} mapBrowserEvent The event to handle.
  */
 ol.Map.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
-  if (goog.isNull(this.frameState_)) {
+  if (!this.frameState_) {
     // With no view defined, we cannot translate pixels into geographical
     // coordinates so interactions cannot be used.
     return;
@@ -982,7 +982,7 @@ ol.Map.prototype.handlePostRender = function() {
     var maxTotalLoading = 16;
     var maxNewLoads = maxTotalLoading;
     var tileSourceCount = 0;
-    if (!goog.isNull(frameState)) {
+    if (frameState) {
       var hints = frameState.viewHints;
       if (hints[ol.ViewHint.ANIMATING]) {
         maxTotalLoading = this.loadTilesWhileAnimating_ ? 8 : 0;
@@ -1032,20 +1032,20 @@ ol.Map.prototype.handleTargetChanged_ = function() {
 
   this.keyHandler_.detach();
 
-  if (goog.isNull(targetElement)) {
+  if (!targetElement) {
     goog.dom.removeNode(this.viewport_);
-    if (!goog.isNull(this.viewportResizeListenerKey_)) {
+    if (this.viewportResizeListenerKey_) {
       goog.events.unlistenByKey(this.viewportResizeListenerKey_);
       this.viewportResizeListenerKey_ = null;
     }
   } else {
     goog.dom.appendChild(targetElement, this.viewport_);
 
-    var keyboardEventTarget = goog.isNull(this.keyboardEventTarget_) ?
+    var keyboardEventTarget = !this.keyboardEventTarget_ ?
         targetElement : this.keyboardEventTarget_;
     this.keyHandler_.attach(keyboardEventTarget);
 
-    if (goog.isNull(this.viewportResizeListenerKey_)) {
+    if (!this.viewportResizeListenerKey_) {
       this.viewportResizeListenerKey_ = goog.events.listen(
           this.viewportSizeMonitor_, goog.events.EventType.RESIZE,
           this.updateSize, false, this);
@@ -1078,12 +1078,12 @@ ol.Map.prototype.handleViewPropertyChanged_ = function() {
  * @private
  */
 ol.Map.prototype.handleViewChanged_ = function() {
-  if (!goog.isNull(this.viewPropertyListenerKey_)) {
+  if (this.viewPropertyListenerKey_) {
     goog.events.unlistenByKey(this.viewPropertyListenerKey_);
     this.viewPropertyListenerKey_ = null;
   }
   var view = this.getView();
-  if (!goog.isNull(view)) {
+  if (view) {
     this.viewPropertyListenerKey_ = goog.events.listen(
         view, ol.ObjectEventType.PROPERTYCHANGE,
         this.handleViewPropertyChanged_, false, this);
@@ -1118,7 +1118,7 @@ ol.Map.prototype.handleLayerGroupPropertyChanged_ = function(event) {
  * @private
  */
 ol.Map.prototype.handleLayerGroupChanged_ = function() {
-  if (!goog.isNull(this.layerGroupPropertyListenerKeys_)) {
+  if (this.layerGroupPropertyListenerKeys_) {
     this.layerGroupPropertyListenerKeys_.forEach(goog.events.unlistenByKey);
     this.layerGroupPropertyListenerKeys_ = null;
   }
@@ -1155,7 +1155,7 @@ ol.Map.prototype.isDef = function() {
     return false;
   }
   var view = this.getView();
-  if (goog.isNull(view) || !view.isDef()) {
+  if (!view || !view.isDef()) {
     return false;
   }
   return true;
@@ -1166,7 +1166,7 @@ ol.Map.prototype.isDef = function() {
  * @return {boolean} Is rendered.
  */
 ol.Map.prototype.isRendered = function() {
-  return !goog.isNull(this.frameState_);
+  return this.frameState_ !== null;
 };
 
 
@@ -1259,7 +1259,7 @@ ol.Map.prototype.renderFrame_ = function(time) {
   /** @type {?olx.FrameState} */
   var frameState = null;
   if (size !== undefined && ol.size.hasArea(size) &&
-      !goog.isNull(view) && view.isDef()) {
+      view && view.isDef()) {
     var viewHints = view.getHints();
     var layerStatesArray = this.getLayerGroup().getLayerStatesArray();
     var layerStates = {};
@@ -1272,7 +1272,7 @@ ol.Map.prototype.renderFrame_ = function(time) {
       attributions: {},
       coordinateToPixelMatrix: this.coordinateToPixelMatrix_,
       extent: null,
-      focus: goog.isNull(this.focus_) ? viewState.center : this.focus_,
+      focus: !this.focus_ ? viewState.center : this.focus_,
       index: this.frameIndex_++,
       layerStates: layerStates,
       layerStatesArray: layerStatesArray,
@@ -1291,7 +1291,7 @@ ol.Map.prototype.renderFrame_ = function(time) {
     });
   }
 
-  if (!goog.isNull(frameState)) {
+  if (frameState) {
     var preRenderFunctions = this.preRenderFunctions_;
     var n = 0, preRenderFunction;
     for (i = 0, ii = preRenderFunctions.length; i < ii; ++i) {
@@ -1309,7 +1309,7 @@ ol.Map.prototype.renderFrame_ = function(time) {
   this.frameState_ = frameState;
   this.renderer_.renderFrame(frameState);
 
-  if (!goog.isNull(frameState)) {
+  if (frameState) {
     if (frameState.animate) {
       this.render();
     }
@@ -1400,7 +1400,7 @@ ol.Map.prototype.skipFeature = function(feature) {
 ol.Map.prototype.updateSize = function() {
   var targetElement = this.getTargetElement();
 
-  if (goog.isNull(targetElement)) {
+  if (!targetElement) {
     this.setSize(undefined);
   } else {
     var size = goog.style.getContentBoxSize(targetElement);