diff --git a/src/ol/control/attributioncontrol.js b/src/ol/control/attributioncontrol.js
index fd87d72162..61d5a468c1 100644
--- a/src/ol/control/attributioncontrol.js
+++ b/src/ol/control/attributioncontrol.js
@@ -164,15 +164,15 @@ ol.control.Attribution.prototype.getSourceAttributions = function(frameState) {
   /** @type {Object.<string, ol.Attribution>} */
   var hiddenAttributions = {};
   var projection = frameState.viewState.projection;
-  goog.asserts.assert(!goog.isNull(projection), 'projection cannot be null');
+  goog.asserts.assert(projection, 'projection of viewState required');
   for (i = 0, ii = layerStatesArray.length; i < ii; i++) {
     source = layerStatesArray[i].layer.getSource();
-    if (goog.isNull(source)) {
+    if (!source) {
       continue;
     }
     sourceKey = goog.getUid(source).toString();
     sourceAttributions = source.getAttributions();
-    if (goog.isNull(sourceAttributions)) {
+    if (!sourceAttributions) {
       continue;
     }
     for (j = 0, jj = sourceAttributions.length; j < jj; j++) {
@@ -186,7 +186,7 @@ ol.control.Attribution.prototype.getSourceAttributions = function(frameState) {
         goog.asserts.assertInstanceof(source, ol.source.Tile,
             'source should be an ol.source.Tile');
         var tileGrid = source.getTileGridForProjection(projection);
-        goog.asserts.assert(!goog.isNull(tileGrid), 'tileGrid cannot be null');
+        goog.asserts.assert(tileGrid, 'tileGrid required for projection');
         intersectsTileRange = sourceAttribution.intersectsAnyTileRange(
             tileRanges, tileGrid, projection);
       } else {
@@ -223,7 +223,7 @@ ol.control.Attribution.render = function(mapEvent) {
  */
 ol.control.Attribution.prototype.updateElement_ = function(frameState) {
 
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     if (this.renderedVisible_) {
       goog.style.setElementShown(this.element, false);
       this.renderedVisible_ = false;
diff --git a/src/ol/control/control.js b/src/ol/control/control.js
index abd9ee5171..5d129bae1a 100644
--- a/src/ol/control/control.js
+++ b/src/ol/control/control.js
@@ -105,7 +105,7 @@ ol.control.Control.prototype.getMap = function() {
  * @api stable
  */
 ol.control.Control.prototype.setMap = function(map) {
-  if (!goog.isNull(this.map_)) {
+  if (this.map_) {
     goog.dom.removeNode(this.element);
   }
   if (this.listenerKeys.length > 0) {
@@ -113,8 +113,8 @@ ol.control.Control.prototype.setMap = function(map) {
     this.listenerKeys.length = 0;
   }
   this.map_ = map;
-  if (!goog.isNull(this.map_)) {
-    var target = !goog.isNull(this.target_) ?
+  if (this.map_) {
+    var target = this.target_ ?
         this.target_ : map.getOverlayContainerStopEvent();
     goog.dom.appendChild(target, this.element);
     if (this.render !== ol.nullFunction) {
diff --git a/src/ol/control/fullscreencontrol.js b/src/ol/control/fullscreencontrol.js
index b085409540..794310d45d 100644
--- a/src/ol/control/fullscreencontrol.js
+++ b/src/ol/control/fullscreencontrol.js
@@ -107,7 +107,7 @@ ol.control.FullScreen.prototype.handleFullScreen_ = function() {
     return;
   }
   var map = this.getMap();
-  if (goog.isNull(map)) {
+  if (!map) {
     return;
   }
   if (goog.dom.fullscreen.isFullScreen()) {
@@ -141,7 +141,7 @@ ol.control.FullScreen.prototype.handleFullScreenChange_ = function() {
     goog.dom.classlist.swap(button, opened, closed);
     goog.dom.replaceNode(this.labelNode_, this.labelActiveNode_);
   }
-  if (!goog.isNull(map)) {
+  if (map) {
     map.updateSize();
   }
 };
diff --git a/src/ol/control/mousepositioncontrol.js b/src/ol/control/mousepositioncontrol.js
index a4fd1e2ff3..91911ba0e5 100644
--- a/src/ol/control/mousepositioncontrol.js
+++ b/src/ol/control/mousepositioncontrol.js
@@ -108,7 +108,7 @@ goog.inherits(ol.control.MousePosition, ol.control.Control);
  */
 ol.control.MousePosition.render = function(mapEvent) {
   var frameState = mapEvent.frameState;
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     this.mapProjection_ = null;
   } else {
     if (this.mapProjection_ != frameState.viewState.projection) {
@@ -182,7 +182,7 @@ ol.control.MousePosition.prototype.handleMouseOut = function(browserEvent) {
  */
 ol.control.MousePosition.prototype.setMap = function(map) {
   goog.base(this, 'setMap', map);
-  if (!goog.isNull(map)) {
+  if (map) {
     var viewport = map.getViewport();
     this.listenerKeys.push(
         goog.events.listen(viewport, goog.events.EventType.MOUSEMOVE,
@@ -224,8 +224,8 @@ ol.control.MousePosition.prototype.setProjection = function(projection) {
  */
 ol.control.MousePosition.prototype.updateHTML_ = function(pixel) {
   var html = this.undefinedHTML_;
-  if (!goog.isNull(pixel) && !goog.isNull(this.mapProjection_)) {
-    if (goog.isNull(this.transform_)) {
+  if (pixel && this.mapProjection_) {
+    if (!this.transform_) {
       var projection = this.getProjection();
       if (projection) {
         this.transform_ = ol.proj.getTransformFromProjections(
@@ -236,7 +236,7 @@ ol.control.MousePosition.prototype.updateHTML_ = function(pixel) {
     }
     var map = this.getMap();
     var coordinate = map.getCoordinateFromPixel(pixel);
-    if (!goog.isNull(coordinate)) {
+    if (coordinate) {
       this.transform_(coordinate, coordinate);
       var coordinateFormat = this.getCoordinateFormat();
       if (coordinateFormat) {
diff --git a/src/ol/control/rotatecontrol.js b/src/ol/control/rotatecontrol.js
index 2ab71b2d05..725c138e1f 100644
--- a/src/ol/control/rotatecontrol.js
+++ b/src/ol/control/rotatecontrol.js
@@ -113,7 +113,7 @@ ol.control.Rotate.prototype.handleClick_ = function(event) {
 ol.control.Rotate.prototype.resetNorth_ = function() {
   var map = this.getMap();
   var view = map.getView();
-  if (goog.isNull(view)) {
+  if (!view) {
     // the map does not have a view, so we can't act
     // upon it
     return;
@@ -147,7 +147,7 @@ ol.control.Rotate.prototype.resetNorth_ = function() {
  */
 ol.control.Rotate.render = function(mapEvent) {
   var frameState = mapEvent.frameState;
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     return;
   }
   var rotation = frameState.viewState.rotation;
diff --git a/src/ol/control/scalelinecontrol.js b/src/ol/control/scalelinecontrol.js
index 477cfad3a7..7c043e616c 100644
--- a/src/ol/control/scalelinecontrol.js
+++ b/src/ol/control/scalelinecontrol.js
@@ -160,7 +160,7 @@ ol.control.ScaleLine.prototype.getUnits = function() {
  */
 ol.control.ScaleLine.render = function(mapEvent) {
   var frameState = mapEvent.frameState;
-  if (goog.isNull(frameState)) {
+  if (!frameState) {
     this.viewState_ = null;
   } else {
     this.viewState_ = frameState.viewState;
@@ -194,7 +194,7 @@ ol.control.ScaleLine.prototype.setUnits = function(units) {
 ol.control.ScaleLine.prototype.updateElement_ = function() {
   var viewState = this.viewState_;
 
-  if (goog.isNull(viewState)) {
+  if (!viewState) {
     if (this.renderedVisible_) {
       goog.style.setElementShown(this.element_, false);
       this.renderedVisible_ = false;
@@ -226,7 +226,7 @@ ol.control.ScaleLine.prototype.updateElement_ = function() {
       units == ol.control.ScaleLineUnits.DEGREES) {
 
     // Convert pointResolution from other units to degrees
-    if (goog.isNull(this.toEPSG4326_)) {
+    if (!this.toEPSG4326_) {
       this.toEPSG4326_ = ol.proj.getTransformFromProjections(
           projection, ol.proj.get('EPSG:4326'));
     }
diff --git a/src/ol/control/zoomcontrol.js b/src/ol/control/zoomcontrol.js
index 62cca622b6..65451c6077 100644
--- a/src/ol/control/zoomcontrol.js
+++ b/src/ol/control/zoomcontrol.js
@@ -96,7 +96,7 @@ ol.control.Zoom.prototype.handleClick_ = function(delta, event) {
 ol.control.Zoom.prototype.zoomByDelta_ = function(delta) {
   var map = this.getMap();
   var view = map.getView();
-  if (goog.isNull(view)) {
+  if (!view) {
     // the map does not have a view, so we can't act
     // upon it
     return;
diff --git a/src/ol/control/zoomslidercontrol.js b/src/ol/control/zoomslidercontrol.js
index a98342bd63..4ecc07da67 100644
--- a/src/ol/control/zoomslidercontrol.js
+++ b/src/ol/control/zoomslidercontrol.js
@@ -130,7 +130,7 @@ ol.control.ZoomSlider.direction = {
  */
 ol.control.ZoomSlider.prototype.setMap = function(map) {
   goog.base(this, 'setMap', map);
-  if (!goog.isNull(map)) {
+  if (map) {
     map.render();
   }
 };
@@ -179,7 +179,7 @@ ol.control.ZoomSlider.prototype.initSlider_ = function() {
  * @api
  */
 ol.control.ZoomSlider.render = function(mapEvent) {
-  if (goog.isNull(mapEvent.frameState)) {
+  if (!mapEvent.frameState) {
     return;
   }
   goog.asserts.assert(mapEvent.frameState.viewState,
diff --git a/src/ol/control/zoomtoextentcontrol.js b/src/ol/control/zoomtoextentcontrol.js
index 868618d8b8..bf0fef466f 100644
--- a/src/ol/control/zoomtoextentcontrol.js
+++ b/src/ol/control/zoomtoextentcontrol.js
@@ -71,7 +71,7 @@ ol.control.ZoomToExtent.prototype.handleClick_ = function(event) {
 ol.control.ZoomToExtent.prototype.handleZoomToExtent_ = function() {
   var map = this.getMap();
   var view = map.getView();
-  var extent = goog.isNull(this.extent_) ?
+  var extent = !this.extent_ ?
       view.getProjection().getExtent() : this.extent_;
   var size = map.getSize();
   goog.asserts.assert(size, 'size should be defined');