diff --git a/src/ol/geolocation.js b/src/ol/geolocation.js
index c6d35470d8..c6d14c2a51 100644
--- a/src/ol/geolocation.js
+++ b/src/ol/geolocation.js
@@ -97,7 +97,7 @@ ol.Geolocation = function(opt_options) {
     this.setTrackingOptions(options.trackingOptions);
   }
 
-  this.setTracking(goog.isDef(options.tracking) ? options.tracking : false);
+  this.setTracking(options.tracking !== undefined ? options.tracking : false);
 
 };
 goog.inherits(ol.Geolocation, ol.Object);
@@ -139,7 +139,7 @@ ol.Geolocation.prototype.handleTrackingChanged_ = function() {
           goog.bind(this.positionChange_, this),
           goog.bind(this.positionError_, this),
           this.getTrackingOptions());
-    } else if (!tracking && goog.isDef(this.watchId_)) {
+    } else if (!tracking && this.watchId_ !== undefined) {
       goog.global.navigator.geolocation.clearWatch(this.watchId_);
       this.watchId_ = undefined;
     }
diff --git a/src/ol/graticule.js b/src/ol/graticule.js
index 3a3ca588b7..4d5b012042 100644
--- a/src/ol/graticule.js
+++ b/src/ol/graticule.js
@@ -86,14 +86,14 @@ ol.Graticule = function(opt_options) {
    * @type {number}
    * @private
    */
-  this.targetSize_ = goog.isDef(options.targetSize) ?
+  this.targetSize_ = options.targetSize !== undefined ?
       options.targetSize : 100;
 
   /**
    * @type {number}
    * @private
    */
-  this.maxLines_ = goog.isDef(options.maxLines) ? options.maxLines : 100;
+  this.maxLines_ = options.maxLines !== undefined ? options.maxLines : 100;
   goog.asserts.assert(this.maxLines_ > 0,
       'this.maxLines_ should be more than 0');
 
@@ -113,7 +113,7 @@ ol.Graticule = function(opt_options) {
    * @type {ol.style.Stroke}
    * @private
    */
-  this.strokeStyle_ = goog.isDef(options.strokeStyle) ?
+  this.strokeStyle_ = options.strokeStyle !== undefined ?
       options.strokeStyle : ol.Graticule.DEFAULT_STROKE_STYLE_;
 
   /**
@@ -134,7 +134,7 @@ ol.Graticule = function(opt_options) {
    */
   this.projectionCenterLonLat_ = null;
 
-  this.setMap(goog.isDef(options.map) ? options.map : null);
+  this.setMap(options.map !== undefined ? options.map : null);
 };
 
 
diff --git a/src/ol/imagebase.js b/src/ol/imagebase.js
index 5e0a464fbb..e188221977 100644
--- a/src/ol/imagebase.js
+++ b/src/ol/imagebase.js
@@ -110,7 +110,7 @@ ol.ImageBase.prototype.getPixelRatio = function() {
  * @return {number} Resolution.
  */
 ol.ImageBase.prototype.getResolution = function() {
-  goog.asserts.assert(goog.isDef(this.resolution), 'resolution not yet set');
+  goog.asserts.assert(this.resolution !== undefined, 'resolution not yet set');
   return this.resolution;
 };
 
diff --git a/src/ol/interaction/translateinteraction.js b/src/ol/interaction/translateinteraction.js
index 09fbe8c349..1f2ec0bd1e 100644
--- a/src/ol/interaction/translateinteraction.js
+++ b/src/ol/interaction/translateinteraction.js
@@ -42,7 +42,7 @@ ol.interaction.Translate = function(options) {
    * @type {ol.Collection.<ol.Feature>}
    * @private
    */
-  this.features_ = goog.isDef(options.features) ? options.features : null;
+  this.features_ = options.features !== undefined ? options.features : null;
 
   /**
    * @type {ol.Feature}
@@ -147,7 +147,7 @@ ol.interaction.Translate.handleMoveEvent_ = function(event)
         'grabbing' : (isSelected ? 'grab' : 'pointer');
 
   } else {
-    elem.style.cursor = goog.isDef(this.previousCursor_) ?
+    elem.style.cursor = this.previousCursor_ !== undefined ?
         this.previousCursor_ : '';
     this.previousCursor_ = undefined;
   }
diff --git a/src/ol/map.js b/src/ol/map.js
index cf7e509e68..dfb9618635 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -181,22 +181,23 @@ ol.Map = function(options) {
    * @type {boolean}
    * @private
    */
-  this.loadTilesWhileAnimating_ = goog.isDef(options.loadTilesWhileAnimating) ?
-      options.loadTilesWhileAnimating : false;
+  this.loadTilesWhileAnimating_ =
+      options.loadTilesWhileAnimating !== undefined ?
+          options.loadTilesWhileAnimating : false;
 
   /**
    * @type {boolean}
    * @private
    */
   this.loadTilesWhileInteracting_ =
-      goog.isDef(options.loadTilesWhileInteracting) ?
+      options.loadTilesWhileInteracting !== undefined ?
           options.loadTilesWhileInteracting : false;
 
   /**
    * @private
    * @type {number}
    */
-  this.pixelRatio_ = goog.isDef(options.pixelRatio) ?
+  this.pixelRatio_ = options.pixelRatio !== undefined ?
       options.pixelRatio : ol.has.DEVICE_PIXEL_RATIO;
 
   /**
@@ -1486,7 +1487,7 @@ ol.Map.createOptionsInternal = function(options) {
 
   values[ol.MapProperty.TARGET] = options.target;
 
-  values[ol.MapProperty.VIEW] = goog.isDef(options.view) ?
+  values[ol.MapProperty.VIEW] = options.view !== undefined ?
       options.view : new ol.View();
 
   /**
diff --git a/src/ol/overlay.js b/src/ol/overlay.js
index 97950b21c3..33c12c7cf9 100644
--- a/src/ol/overlay.js
+++ b/src/ol/overlay.js
@@ -78,14 +78,14 @@ ol.Overlay = function(options) {
    * @private
    * @type {boolean}
    */
-  this.insertFirst_ = goog.isDef(options.insertFirst) ?
+  this.insertFirst_ = options.insertFirst !== undefined ?
       options.insertFirst : true;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.stopEvent_ = goog.isDef(options.stopEvent) ? options.stopEvent : true;
+  this.stopEvent_ = options.stopEvent !== undefined ? options.stopEvent : true;
 
   /**
    * @private
@@ -100,20 +100,20 @@ ol.Overlay = function(options) {
    * @protected
    * @type {boolean}
    */
-  this.autoPan = goog.isDef(options.autoPan) ? options.autoPan : false;
+  this.autoPan = options.autoPan !== undefined ? options.autoPan : false;
 
   /**
    * @private
    * @type {olx.animation.PanOptions}
    */
-  this.autoPanAnimation_ = goog.isDef(options.autoPanAnimation) ?
+  this.autoPanAnimation_ = options.autoPanAnimation !== undefined ?
       options.autoPanAnimation : /** @type {olx.animation.PanOptions} */ ({});
 
   /**
    * @private
    * @type {number}
    */
-  this.autoPanMargin_ = goog.isDef(options.autoPanMargin) ?
+  this.autoPanMargin_ = options.autoPanMargin !== undefined ?
       options.autoPanMargin : 20;
 
   /**
@@ -162,9 +162,9 @@ ol.Overlay = function(options) {
     this.setElement(options.element);
   }
 
-  this.setOffset(goog.isDef(options.offset) ? options.offset : [0, 0]);
+  this.setOffset(options.offset !== undefined ? options.offset : [0, 0]);
 
-  this.setPositioning(goog.isDef(options.positioning) ?
+  this.setPositioning(options.positioning !== undefined ?
       /** @type {ol.OverlayPositioning} */ (options.positioning) :
       ol.OverlayPositioning.TOP_LEFT);
 
diff --git a/src/ol/proj/proj.js b/src/ol/proj/proj.js
index dd14c7fded..47b209dff2 100644
--- a/src/ol/proj/proj.js
+++ b/src/ol/proj/proj.js
@@ -99,27 +99,27 @@ ol.proj.Projection = function(options) {
    * @private
    * @type {ol.Extent}
    */
-  this.extent_ = goog.isDef(options.extent) ? options.extent : null;
+  this.extent_ = options.extent !== undefined ? options.extent : null;
 
   /**
    * @private
    * @type {ol.Extent}
    */
-  this.worldExtent_ = goog.isDef(options.worldExtent) ?
+  this.worldExtent_ = options.worldExtent !== undefined ?
       options.worldExtent : null;
 
   /**
    * @private
    * @type {string}
    */
-  this.axisOrientation_ = goog.isDef(options.axisOrientation) ?
+  this.axisOrientation_ = options.axisOrientation !== undefined ?
       options.axisOrientation : 'enu';
 
   /**
    * @private
    * @type {boolean}
    */
-  this.global_ = goog.isDef(options.global) ? options.global : false;
+  this.global_ = options.global !== undefined ? options.global : false;
 
 
   /**
@@ -132,7 +132,7 @@ ol.proj.Projection = function(options) {
   * @private
   * @type {function(number, ol.Coordinate):number}
   */
-  this.getPointResolutionFunc_ = goog.isDef(options.getPointResolution) ?
+  this.getPointResolutionFunc_ = options.getPointResolution !== undefined ?
       options.getPointResolution : this.getPointResolution_;
 
   /**
@@ -149,7 +149,7 @@ ol.proj.Projection = function(options) {
       !goog.isDef(projections[code])) {
     var def = proj4.defs(code);
     if (def !== undefined) {
-      if (goog.isDef(def.axis) && options.axisOrientation === undefined) {
+      if (def.axis !== undefined && options.axisOrientation === undefined) {
         this.axisOrientation_ = def.axis;
       }
       if (options.units === undefined) {
diff --git a/src/ol/render/canvas/canvasreplay.js b/src/ol/render/canvas/canvasreplay.js
index 8e33020d22..a3a44356d3 100644
--- a/src/ol/render/canvas/canvasreplay.js
+++ b/src/ol/render/canvas/canvasreplay.js
@@ -716,25 +716,25 @@ ol.render.canvas.ImageReplay.prototype.drawPointGeometry =
   if (goog.isNull(this.image_)) {
     return;
   }
-  goog.asserts.assert(goog.isDef(this.anchorX_),
+  goog.asserts.assert(this.anchorX_ !== undefined,
       'this.anchorX_ should be defined');
-  goog.asserts.assert(goog.isDef(this.anchorY_),
+  goog.asserts.assert(this.anchorY_ !== undefined,
       'this.anchorY_ should be defined');
-  goog.asserts.assert(goog.isDef(this.height_),
+  goog.asserts.assert(this.height_ !== undefined,
       'this.height_ should be defined');
-  goog.asserts.assert(goog.isDef(this.opacity_),
+  goog.asserts.assert(this.opacity_ !== undefined,
       'this.opacity_ should be defined');
-  goog.asserts.assert(goog.isDef(this.originX_),
+  goog.asserts.assert(this.originX_ !== undefined,
       'this.originX_ should be defined');
-  goog.asserts.assert(goog.isDef(this.originY_),
+  goog.asserts.assert(this.originY_ !== undefined,
       'this.originY_ should be defined');
-  goog.asserts.assert(goog.isDef(this.rotateWithView_),
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
       'this.rotateWithView_ should be defined');
-  goog.asserts.assert(goog.isDef(this.rotation_),
+  goog.asserts.assert(this.rotation_ !== undefined,
       'this.rotation_ should be defined');
-  goog.asserts.assert(goog.isDef(this.scale_),
+  goog.asserts.assert(this.scale_ !== undefined,
       'this.scale_ should be defined');
-  goog.asserts.assert(goog.isDef(this.width_),
+  goog.asserts.assert(this.width_ !== undefined,
       'this.width_ should be defined');
   this.beginGeometry(pointGeometry, feature);
   var flatCoordinates = pointGeometry.getFlatCoordinates();
@@ -769,25 +769,25 @@ ol.render.canvas.ImageReplay.prototype.drawMultiPointGeometry =
   if (goog.isNull(this.image_)) {
     return;
   }
-  goog.asserts.assert(goog.isDef(this.anchorX_),
+  goog.asserts.assert(this.anchorX_ !== undefined,
       'this.anchorX_ should be defined');
-  goog.asserts.assert(goog.isDef(this.anchorY_),
+  goog.asserts.assert(this.anchorY_ !== undefined,
       'this.anchorY_ should be defined');
-  goog.asserts.assert(goog.isDef(this.height_),
+  goog.asserts.assert(this.height_ !== undefined,
       'this.height_ should be defined');
-  goog.asserts.assert(goog.isDef(this.opacity_),
+  goog.asserts.assert(this.opacity_ !== undefined,
       'this.opacity_ should be defined');
-  goog.asserts.assert(goog.isDef(this.originX_),
+  goog.asserts.assert(this.originX_ !== undefined,
       'this.originX_ should be defined');
-  goog.asserts.assert(goog.isDef(this.originY_),
+  goog.asserts.assert(this.originY_ !== undefined,
       'this.originY_ should be defined');
-  goog.asserts.assert(goog.isDef(this.rotateWithView_),
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
       'this.rotateWithView_ should be defined');
-  goog.asserts.assert(goog.isDef(this.rotation_),
+  goog.asserts.assert(this.rotation_ !== undefined,
       'this.rotation_ should be defined');
-  goog.asserts.assert(goog.isDef(this.scale_),
+  goog.asserts.assert(this.scale_ !== undefined,
       'this.scale_ should be defined');
-  goog.asserts.assert(goog.isDef(this.width_),
+  goog.asserts.assert(this.width_ !== undefined,
       'this.width_ should be defined');
   this.beginGeometry(multiPointGeometry, feature);
   var flatCoordinates = multiPointGeometry.getFlatCoordinates();
@@ -1198,7 +1198,7 @@ ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ =
     this.instructions.push(fillInstruction);
   }
   if (state.strokeStyle !== undefined) {
-    goog.asserts.assert(goog.isDef(state.lineWidth),
+    goog.asserts.assert(state.lineWidth !== undefined,
         'state.lineWidth should be defined');
     var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
     this.instructions.push(strokeInstruction);
@@ -1221,7 +1221,7 @@ ol.render.canvas.PolygonReplay.prototype.drawCircleGeometry =
     return;
   }
   if (strokeStyle !== undefined) {
-    goog.asserts.assert(goog.isDef(state.lineWidth),
+    goog.asserts.assert(state.lineWidth !== undefined,
         'state.lineWidth should be defined');
   }
   this.setFillStrokeStyles_();
@@ -1251,7 +1251,7 @@ ol.render.canvas.PolygonReplay.prototype.drawCircleGeometry =
     this.instructions.push(fillInstruction);
   }
   if (state.strokeStyle !== undefined) {
-    goog.asserts.assert(goog.isDef(state.lineWidth),
+    goog.asserts.assert(state.lineWidth !== undefined,
         'state.lineWidth should be defined');
     var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
     this.instructions.push(strokeInstruction);
@@ -1274,7 +1274,7 @@ ol.render.canvas.PolygonReplay.prototype.drawPolygonGeometry =
     return;
   }
   if (strokeStyle !== undefined) {
-    goog.asserts.assert(goog.isDef(state.lineWidth),
+    goog.asserts.assert(state.lineWidth !== undefined,
         'state.lineWidth should be defined');
   }
   this.setFillStrokeStyles_();
@@ -1310,7 +1310,7 @@ ol.render.canvas.PolygonReplay.prototype.drawMultiPolygonGeometry =
     return;
   }
   if (strokeStyle !== undefined) {
-    goog.asserts.assert(goog.isDef(state.lineWidth),
+    goog.asserts.assert(state.lineWidth !== undefined,
         'state.lineWidth should be defined');
   }
   this.setFillStrokeStyles_();
diff --git a/src/ol/render/webgl/webglreplay.js b/src/ol/render/webgl/webglreplay.js
index bb9e91f52b..b450e650db 100644
--- a/src/ol/render/webgl/webglreplay.js
+++ b/src/ol/render/webgl/webglreplay.js
@@ -280,19 +280,20 @@ ol.render.webgl.ImageReplay.prototype.drawAsync = goog.abstractMethod;
  */
 ol.render.webgl.ImageReplay.prototype.drawCoordinates_ =
     function(flatCoordinates, offset, end, stride) {
-  goog.asserts.assert(goog.isDef(this.anchorX_), 'anchorX is defined');
-  goog.asserts.assert(goog.isDef(this.anchorY_), 'anchorY is defined');
-  goog.asserts.assert(goog.isDef(this.height_), 'height is defined');
-  goog.asserts.assert(goog.isDef(this.imageHeight_), 'imageHeight is defined');
-  goog.asserts.assert(goog.isDef(this.imageWidth_), 'imageWidth is defined');
-  goog.asserts.assert(goog.isDef(this.opacity_), 'opacity is defined');
-  goog.asserts.assert(goog.isDef(this.originX_), 'originX is defined');
-  goog.asserts.assert(goog.isDef(this.originY_), 'originY is defined');
-  goog.asserts.assert(goog.isDef(this.rotateWithView_),
+  goog.asserts.assert(this.anchorX_ !== undefined, 'anchorX is defined');
+  goog.asserts.assert(this.anchorY_ !== undefined, 'anchorY is defined');
+  goog.asserts.assert(this.height_ !== undefined, 'height is defined');
+  goog.asserts.assert(this.imageHeight_ !== undefined,
+      'imageHeight is defined');
+  goog.asserts.assert(this.imageWidth_ !== undefined, 'imageWidth is defined');
+  goog.asserts.assert(this.opacity_ !== undefined, 'opacity is defined');
+  goog.asserts.assert(this.originX_ !== undefined, 'originX is defined');
+  goog.asserts.assert(this.originY_ !== undefined, 'originY is defined');
+  goog.asserts.assert(this.rotateWithView_ !== undefined,
       'rotateWithView is defined');
-  goog.asserts.assert(goog.isDef(this.rotation_), 'rotation is defined');
-  goog.asserts.assert(goog.isDef(this.scale_), 'scale is defined');
-  goog.asserts.assert(goog.isDef(this.width_), 'width is defined');
+  goog.asserts.assert(this.rotation_ !== undefined, 'rotation is defined');
+  goog.asserts.assert(this.scale_ !== undefined, 'scale is defined');
+  goog.asserts.assert(this.width_ !== undefined, 'width is defined');
   var anchorX = this.anchorX_;
   var anchorY = this.anchorY_;
   var height = this.height_;
diff --git a/src/ol/source/bingmapssource.js b/src/ol/source/bingmapssource.js
index 4e2da51682..490bd7e2a2 100644
--- a/src/ol/source/bingmapssource.js
+++ b/src/ol/source/bingmapssource.js
@@ -32,20 +32,20 @@ ol.source.BingMaps = function(options) {
     projection: ol.proj.get('EPSG:3857'),
     state: ol.source.State.LOADING,
     tileLoadFunction: options.tileLoadFunction,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   /**
    * @private
    * @type {string}
    */
-  this.culture_ = goog.isDef(options.culture) ? options.culture : 'en-us';
+  this.culture_ = options.culture !== undefined ? options.culture : 'en-us';
 
   /**
    * @private
    * @type {number}
    */
-  this.maxZoom_ = goog.isDef(options.maxZoom) ? options.maxZoom : -1;
+  this.maxZoom_ = options.maxZoom !== undefined ? options.maxZoom : -1;
 
   var uri = new goog.Uri(
       'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/' +
diff --git a/src/ol/source/clustersource.js b/src/ol/source/clustersource.js
index d1e15c01c3..c2ba38a1d0 100644
--- a/src/ol/source/clustersource.js
+++ b/src/ol/source/clustersource.js
@@ -42,7 +42,7 @@ ol.source.Cluster = function(options) {
    * @type {number}
    * @private
    */
-  this.distance_ = goog.isDef(options.distance) ? options.distance : 20;
+  this.distance_ = options.distance !== undefined ? options.distance : 20;
 
   /**
    * @type {Array.<ol.Feature>}
diff --git a/src/ol/source/imagecanvassource.js b/src/ol/source/imagecanvassource.js
index 16e390ea17..ba8e8a15f4 100644
--- a/src/ol/source/imagecanvassource.js
+++ b/src/ol/source/imagecanvassource.js
@@ -23,7 +23,7 @@ ol.source.ImageCanvas = function(options) {
     logo: options.logo,
     projection: options.projection,
     resolutions: options.resolutions,
-    state: goog.isDef(options.state) ?
+    state: options.state !== undefined ?
         /** @type {ol.source.State} */ (options.state) : undefined
   });
 
@@ -49,7 +49,7 @@ ol.source.ImageCanvas = function(options) {
    * @private
    * @type {number}
    */
-  this.ratio_ = goog.isDef(options.ratio) ?
+  this.ratio_ = options.ratio !== undefined ?
       options.ratio : 1.5;
 
 };
diff --git a/src/ol/source/imagemapguidesource.js b/src/ol/source/imagemapguidesource.js
index e3bad37c7e..899d8663d0 100644
--- a/src/ol/source/imagemapguidesource.js
+++ b/src/ol/source/imagemapguidesource.js
@@ -34,20 +34,20 @@ ol.source.ImageMapGuide = function(options) {
    * @type {?string}
    */
   this.crossOrigin_ =
-      goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
 
   /**
    * @private
    * @type {number}
    */
-  this.displayDpi_ = goog.isDef(options.displayDpi) ?
+  this.displayDpi_ = options.displayDpi !== undefined ?
       options.displayDpi : 96;
 
   /**
    * @private
    * @type {Object}
    */
-  this.params_ = goog.isDef(options.params) ? options.params : {};
+  this.params_ = options.params !== undefined ? options.params : {};
 
   var imageUrlFunction;
   if (options.url !== undefined) {
@@ -67,33 +67,33 @@ ol.source.ImageMapGuide = function(options) {
    * @private
    * @type {ol.ImageLoadFunctionType}
    */
-  this.imageLoadFunction_ = goog.isDef(options.imageLoadFunction) ?
+  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
       options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
 
   /**
    * @private
    * @type {number}
    */
-  this.metersPerUnit_ = goog.isDef(options.metersPerUnit) ?
+  this.metersPerUnit_ = options.metersPerUnit !== undefined ?
       options.metersPerUnit : 1;
 
   /**
    * @private
    * @type {number}
    */
-  this.ratio_ = goog.isDef(options.ratio) ? options.ratio : 1;
+  this.ratio_ = options.ratio !== undefined ? options.ratio : 1;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.useOverlay_ = goog.isDef(options.useOverlay) ?
+  this.useOverlay_ = options.useOverlay !== undefined ?
       options.useOverlay : false;
 
   /**
diff --git a/src/ol/source/imagesource.js b/src/ol/source/imagesource.js
index 38f726b0eb..2865fb6511 100644
--- a/src/ol/source/imagesource.js
+++ b/src/ol/source/imagesource.js
@@ -48,7 +48,7 @@ ol.source.Image = function(options) {
    * @private
    * @type {Array.<number>}
    */
-  this.resolutions_ = goog.isDef(options.resolutions) ?
+  this.resolutions_ = options.resolutions !== undefined ?
       options.resolutions : null;
   goog.asserts.assert(goog.isNull(this.resolutions_) ||
       goog.array.isSorted(this.resolutions_,
diff --git a/src/ol/source/imagestaticsource.js b/src/ol/source/imagestaticsource.js
index fe7529c477..8bffee68fe 100644
--- a/src/ol/source/imagestaticsource.js
+++ b/src/ol/source/imagestaticsource.js
@@ -21,7 +21,7 @@ goog.require('ol.source.Image');
  */
 ol.source.ImageStatic = function(options) {
 
-  var attributions = goog.isDef(options.attributions) ?
+  var attributions = options.attributions !== undefined ?
       options.attributions : null;
 
   var imageExtent = options.imageExtent;
@@ -32,11 +32,11 @@ ol.source.ImageStatic = function(options) {
     resolutions = [resolution];
   }
 
-  var crossOrigin = goog.isDef(options.crossOrigin) ?
+  var crossOrigin = options.crossOrigin !== undefined ?
       options.crossOrigin : null;
 
   var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
-      goog.isDef(options.imageLoadFunction) ?
+      options.imageLoadFunction !== undefined ?
       options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
 
   goog.base(this, {
diff --git a/src/ol/source/imagewmssource.js b/src/ol/source/imagewmssource.js
index 4f99ac2a82..9b1b51df26 100644
--- a/src/ol/source/imagewmssource.js
+++ b/src/ol/source/imagewmssource.js
@@ -45,7 +45,7 @@ ol.source.ImageWMS = function(opt_options) {
    * @type {?string}
    */
   this.crossOrigin_ =
-      goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
 
   /**
    * @private
@@ -57,7 +57,7 @@ ol.source.ImageWMS = function(opt_options) {
    * @private
    * @type {ol.ImageLoadFunctionType}
    */
-  this.imageLoadFunction_ = goog.isDef(options.imageLoadFunction) ?
+  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
       options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
 
   /**
@@ -84,7 +84,7 @@ ol.source.ImageWMS = function(opt_options) {
    * @private
    * @type {boolean}
    */
-  this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
 
   /**
    * @private
@@ -108,7 +108,7 @@ ol.source.ImageWMS = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.ratio_ = goog.isDef(options.ratio) ? options.ratio : 1.5;
+  this.ratio_ = options.ratio !== undefined ? options.ratio : 1.5;
 
 };
 goog.inherits(ol.source.ImageWMS, ol.source.Image);
@@ -281,7 +281,7 @@ ol.source.ImageWMS.prototype.getImageLoadFunction = function() {
 ol.source.ImageWMS.prototype.getRequestUrl_ =
     function(extent, size, pixelRatio, projection, params) {
 
-  goog.asserts.assert(goog.isDef(this.url_), 'url is defined');
+  goog.asserts.assert(this.url_ !== undefined, 'url is defined');
 
   params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();
 
diff --git a/src/ol/source/mapquestsource.js b/src/ol/source/mapquestsource.js
index f073c13f00..69ecc336b7 100644
--- a/src/ol/source/mapquestsource.js
+++ b/src/ol/source/mapquestsource.js
@@ -31,7 +31,7 @@ ol.source.MapQuest = function(opt_options) {
    */
   this.layer_ = options.layer;
 
-  var url = goog.isDef(options.url) ? options.url :
+  var url = options.url !== undefined ? options.url :
       'https://otile{1-4}-s.mqcdn.com/tiles/1.0.0/' +
       this.layer_ + '/{z}/{x}/{y}.jpg';
 
diff --git a/src/ol/source/osmsource.js b/src/ol/source/osmsource.js
index 9a2c77222c..af17595c5e 100644
--- a/src/ol/source/osmsource.js
+++ b/src/ol/source/osmsource.js
@@ -25,17 +25,17 @@ ol.source.OSM = function(opt_options) {
     attributions = [ol.source.OSM.ATTRIBUTION];
   }
 
-  var crossOrigin = goog.isDef(options.crossOrigin) ?
+  var crossOrigin = options.crossOrigin !== undefined ?
       options.crossOrigin : 'anonymous';
 
-  var url = goog.isDef(options.url) ?
+  var url = options.url !== undefined ?
       options.url : 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';
 
   goog.base(this, {
     attributions: attributions,
     crossOrigin: crossOrigin,
     opaque: true,
-    maxZoom: goog.isDef(options.maxZoom) ? options.maxZoom : 19,
+    maxZoom: options.maxZoom !== undefined ? options.maxZoom : 19,
     tileLoadFunction: options.tileLoadFunction,
     url: url,
     wrapX: options.wrapX
diff --git a/src/ol/source/rastersource.js b/src/ol/source/rastersource.js
index aaa809da4d..70083ab502 100644
--- a/src/ol/source/rastersource.js
+++ b/src/ol/source/rastersource.js
@@ -48,14 +48,14 @@ ol.source.Raster = function(options) {
    * @private
    * @type {ol.raster.OperationType}
    */
-  this.operationType_ = goog.isDef(options.operationType) ?
+  this.operationType_ = options.operationType !== undefined ?
       options.operationType : ol.raster.OperationType.PIXEL;
 
   /**
    * @private
    * @type {number}
    */
-  this.threads_ = goog.isDef(options.threads) ? options.threads : 1;
+  this.threads_ = options.threads !== undefined ? options.threads : 1;
 
   /**
    * @private
diff --git a/src/ol/source/source.js b/src/ol/source/source.js
index fe83c31468..98dc3124ec 100644
--- a/src/ol/source/source.js
+++ b/src/ol/source/source.js
@@ -57,7 +57,7 @@ ol.source.Source = function(options) {
    * @private
    * @type {Array.<ol.Attribution>}
    */
-  this.attributions_ = goog.isDef(options.attributions) ?
+  this.attributions_ = options.attributions !== undefined ?
       options.attributions : null;
 
   /**
@@ -70,14 +70,14 @@ ol.source.Source = function(options) {
    * @private
    * @type {ol.source.State}
    */
-  this.state_ = goog.isDef(options.state) ?
+  this.state_ = options.state !== undefined ?
       options.state : ol.source.State.READY;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.wrapX_ = goog.isDef(options.wrapX) ? options.wrapX : false;
+  this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;
 
 };
 goog.inherits(ol.source.Source, ol.Object);
diff --git a/src/ol/source/stamensource.js b/src/ol/source/stamensource.js
index ed34cb7988..f49f2d8b98 100644
--- a/src/ol/source/stamensource.js
+++ b/src/ol/source/stamensource.js
@@ -98,7 +98,7 @@ ol.source.Stamen = function(options) {
       'known layer configured');
   var layerConfig = ol.source.StamenLayerConfig[options.layer];
 
-  var url = goog.isDef(options.url) ? options.url :
+  var url = options.url !== undefined ? options.url :
       'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
       '/{z}/{x}/{y}.' + layerConfig.extension;
 
diff --git a/src/ol/source/tilearcgisrestsource.js b/src/ol/source/tilearcgisrestsource.js
index 29c7e19d22..663574695c 100644
--- a/src/ol/source/tilearcgisrestsource.js
+++ b/src/ol/source/tilearcgisrestsource.js
@@ -34,7 +34,7 @@ ol.source.TileArcGISRest = function(opt_options) {
 
   var options = opt_options || {};
 
-  var params = goog.isDef(options.params) ? options.params : {};
+  var params = options.params !== undefined ? options.params : {};
 
   goog.base(this, {
     attributions: options.attributions,
@@ -44,11 +44,11 @@ ol.source.TileArcGISRest = function(opt_options) {
     tileGrid: options.tileGrid,
     tileLoadFunction: options.tileLoadFunction,
     tileUrlFunction: goog.bind(this.tileUrlFunction_, this),
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   var urls = options.urls;
-  if (urls === undefined && goog.isDef(options.url)) {
+  if (urls === undefined && options.url !== undefined) {
     urls = ol.TileUrlFunction.expandUrl(options.url);
   }
 
diff --git a/src/ol/source/tiledebugsource.js b/src/ol/source/tiledebugsource.js
index 66b7409fbd..41aed6df4a 100644
--- a/src/ol/source/tiledebugsource.js
+++ b/src/ol/source/tiledebugsource.js
@@ -92,7 +92,7 @@ ol.source.TileDebug = function(options) {
     opaque: false,
     projection: options.projection,
     tileGrid: options.tileGrid,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
 };
diff --git a/src/ol/source/tileimagesource.js b/src/ol/source/tileimagesource.js
index 457143f702..1fddb16652 100644
--- a/src/ol/source/tileimagesource.js
+++ b/src/ol/source/tileimagesource.js
@@ -32,7 +32,7 @@ ol.source.TileImage = function(options) {
     logo: options.logo,
     opaque: options.opaque,
     projection: options.projection,
-    state: goog.isDef(options.state) ?
+    state: options.state !== undefined ?
         /** @type {ol.source.State} */ (options.state) : undefined,
     tileGrid: options.tileGrid,
     tilePixelRatio: options.tilePixelRatio,
@@ -43,7 +43,7 @@ ol.source.TileImage = function(options) {
    * @protected
    * @type {ol.TileUrlFunctionType}
    */
-  this.tileUrlFunction = goog.isDef(options.tileUrlFunction) ?
+  this.tileUrlFunction = options.tileUrlFunction !== undefined ?
       options.tileUrlFunction :
       ol.TileUrlFunction.nullTileUrlFunction;
 
@@ -52,13 +52,13 @@ ol.source.TileImage = function(options) {
    * @type {?string}
    */
   this.crossOrigin =
-      goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
 
   /**
    * @protected
    * @type {ol.TileLoadFunctionType}
    */
-  this.tileLoadFunction = goog.isDef(options.tileLoadFunction) ?
+  this.tileLoadFunction = options.tileLoadFunction !== undefined ?
       options.tileLoadFunction : ol.source.TileImage.defaultTileLoadFunction;
 
   /**
@@ -66,7 +66,7 @@ ol.source.TileImage = function(options) {
    * @type {function(new: ol.ImageTile, ol.TileCoord, ol.TileState, string,
    *        ?string, ol.TileLoadFunctionType)}
    */
-  this.tileClass = goog.isDef(options.tileClass) ?
+  this.tileClass = options.tileClass !== undefined ?
       options.tileClass : ol.ImageTile;
 
 };
diff --git a/src/ol/source/tilejsonsource.js b/src/ol/source/tilejsonsource.js
index 472cfbd181..01982fd896 100644
--- a/src/ol/source/tilejsonsource.js
+++ b/src/ol/source/tilejsonsource.js
@@ -36,7 +36,7 @@ ol.source.TileJSON = function(options) {
     projection: ol.proj.get('EPSG:3857'),
     state: ol.source.State.LOADING,
     tileLoadFunction: options.tileLoadFunction,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   var request = new goog.net.Jsonp(options.url);
@@ -77,7 +77,7 @@ ol.source.TileJSON.prototype.handleTileJSONResponse = function(tileJSON) {
 
   this.tileUrlFunction = ol.TileUrlFunction.createFromTemplates(tileJSON.tiles);
 
-  if (goog.isDef(tileJSON.attribution) &&
+  if (tileJSON.attribution !== undefined &&
       goog.isNull(this.getAttributions())) {
     var attributionExtent = extent !== undefined ?
         extent : epsg4326Projection.getExtent();
diff --git a/src/ol/source/tilesource.js b/src/ol/source/tilesource.js
index b0546ecaaa..ad707f5042 100644
--- a/src/ol/source/tilesource.js
+++ b/src/ol/source/tilesource.js
@@ -56,20 +56,20 @@ ol.source.Tile = function(options) {
    * @private
    * @type {boolean}
    */
-  this.opaque_ = goog.isDef(options.opaque) ? options.opaque : false;
+  this.opaque_ = options.opaque !== undefined ? options.opaque : false;
 
   /**
    * @private
    * @type {number}
    */
-  this.tilePixelRatio_ = goog.isDef(options.tilePixelRatio) ?
+  this.tilePixelRatio_ = options.tilePixelRatio !== undefined ?
       options.tilePixelRatio : 1;
 
   /**
    * @protected
    * @type {ol.tilegrid.TileGrid}
    */
-  this.tileGrid = goog.isDef(options.tileGrid) ? options.tileGrid : null;
+  this.tileGrid = options.tileGrid !== undefined ? options.tileGrid : null;
 
   /**
    * @protected
diff --git a/src/ol/source/tileutfgridsource.js b/src/ol/source/tileutfgridsource.js
index 4786fd8d70..28e96efabb 100644
--- a/src/ol/source/tileutfgridsource.js
+++ b/src/ol/source/tileutfgridsource.js
@@ -35,7 +35,7 @@ ol.source.TileUTFGrid = function(options) {
    * @private
    * @type {boolean}
    */
-  this.preemptive_ = goog.isDef(options.preemptive) ?
+  this.preemptive_ = options.preemptive !== undefined ?
       options.preemptive : true;
 
   /**
diff --git a/src/ol/source/tilevectorsource.js b/src/ol/source/tilevectorsource.js
index 310431a545..af66f75ed9 100644
--- a/src/ol/source/tilevectorsource.js
+++ b/src/ol/source/tilevectorsource.js
@@ -36,7 +36,7 @@ ol.source.TileVector = function(options) {
    * @private
    * @type {ol.format.Feature|undefined}
    */
-  this.format_ = goog.isDef(options.format) ? options.format : null;
+  this.format_ = options.format !== undefined ? options.format : null;
 
   /**
    * @private
@@ -54,7 +54,7 @@ ol.source.TileVector = function(options) {
    * @private
    * @type {?ol.TileVectorLoadFunctionType}
    */
-  this.tileLoadFunction_ = goog.isDef(options.tileLoadFunction) ?
+  this.tileLoadFunction_ = options.tileLoadFunction !== undefined ?
       options.tileLoadFunction : null;
 
   goog.asserts.assert(!goog.isNull(this.format_) ||
diff --git a/src/ol/source/tilewmssource.js b/src/ol/source/tilewmssource.js
index 09c7f6e504..a76089d048 100644
--- a/src/ol/source/tilewmssource.js
+++ b/src/ol/source/tilewmssource.js
@@ -35,7 +35,7 @@ ol.source.TileWMS = function(opt_options) {
 
   var options = opt_options || {};
 
-  var params = goog.isDef(options.params) ? options.params : {};
+  var params = options.params !== undefined ? options.params : {};
 
   var transparent = goog.object.get(params, 'TRANSPARENT', true);
 
@@ -48,11 +48,11 @@ ol.source.TileWMS = function(opt_options) {
     tileGrid: options.tileGrid,
     tileLoadFunction: options.tileLoadFunction,
     tileUrlFunction: goog.bind(this.tileUrlFunction_, this),
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   var urls = options.urls;
-  if (urls === undefined && goog.isDef(options.url)) {
+  if (urls === undefined && options.url !== undefined) {
     urls = ol.TileUrlFunction.expandUrl(options.url);
   }
 
@@ -66,7 +66,7 @@ ol.source.TileWMS = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.gutter_ = goog.isDef(options.gutter) ? options.gutter : 0;
+  this.gutter_ = options.gutter !== undefined ? options.gutter : 0;
 
   /**
    * @private
@@ -91,7 +91,7 @@ ol.source.TileWMS = function(opt_options) {
    * @private
    * @type {boolean}
    */
-  this.hidpi_ = goog.isDef(options.hidpi) ? options.hidpi : true;
+  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
 
   /**
    * @private
diff --git a/src/ol/source/vectorsource.js b/src/ol/source/vectorsource.js
index 48cd84f0e5..fee984991c 100644
--- a/src/ol/source/vectorsource.js
+++ b/src/ol/source/vectorsource.js
@@ -82,7 +82,7 @@ ol.source.Vector = function(opt_options) {
     logo: options.logo,
     projection: undefined,
     state: ol.source.State.READY,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   /**
@@ -94,7 +94,7 @@ ol.source.Vector = function(opt_options) {
   if (options.loader !== undefined) {
     this.loader_ = options.loader;
   } else if (options.url !== undefined) {
-    goog.asserts.assert(goog.isDef(options.format),
+    goog.asserts.assert(options.format !== undefined,
         'format must be set when url is set');
     // create a XHR feature loader for "url" and "format"
     this.loader_ = ol.featureloader.xhr(options.url, options.format);
@@ -104,11 +104,11 @@ ol.source.Vector = function(opt_options) {
    * @private
    * @type {ol.LoadingStrategy}
    */
-  this.strategy_ = goog.isDef(options.strategy) ? options.strategy :
+  this.strategy_ = options.strategy !== undefined ? options.strategy :
       ol.loadingstrategy.all;
 
   var useSpatialIndex =
-      goog.isDef(options.useSpatialIndex) ? options.useSpatialIndex : true;
+      options.useSpatialIndex !== undefined ? options.useSpatialIndex : true;
 
   /**
    * @private
diff --git a/src/ol/source/wmtssource.js b/src/ol/source/wmtssource.js
index 05d646d527..17e24ef6c1 100644
--- a/src/ol/source/wmtssource.js
+++ b/src/ol/source/wmtssource.js
@@ -43,19 +43,19 @@ ol.source.WMTS = function(options) {
    * @private
    * @type {string}
    */
-  this.version_ = goog.isDef(options.version) ? options.version : '1.0.0';
+  this.version_ = options.version !== undefined ? options.version : '1.0.0';
 
   /**
    * @private
    * @type {string}
    */
-  this.format_ = goog.isDef(options.format) ? options.format : 'image/jpeg';
+  this.format_ = options.format !== undefined ? options.format : 'image/jpeg';
 
   /**
    * @private
    * @type {Object}
    */
-  this.dimensions_ = goog.isDef(options.dimensions) ? options.dimensions : {};
+  this.dimensions_ = options.dimensions !== undefined ? options.dimensions : {};
 
   /**
    * @private
@@ -83,7 +83,7 @@ ol.source.WMTS = function(options) {
   this.style_ = options.style;
 
   var urls = options.urls;
-  if (urls === undefined && goog.isDef(options.url)) {
+  if (urls === undefined && options.url !== undefined) {
     urls = ol.TileUrlFunction.expandUrl(options.url);
   }
 
@@ -100,7 +100,7 @@ ol.source.WMTS = function(options) {
    * @private
    * @type {ol.source.WMTSRequestEncoding}
    */
-  this.requestEncoding_ = goog.isDef(options.requestEncoding) ?
+  this.requestEncoding_ = options.requestEncoding !== undefined ?
       /** @type {ol.source.WMTSRequestEncoding} */ (options.requestEncoding) :
       ol.source.WMTSRequestEncoding.KVP;
 
@@ -190,7 +190,7 @@ ol.source.WMTS = function(options) {
     tileLoadFunction: options.tileLoadFunction,
     tilePixelRatio: options.tilePixelRatio,
     tileUrlFunction: tileUrlFunction,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : false
+    wrapX: options.wrapX !== undefined ? options.wrapX : false
   });
 
 };
diff --git a/src/ol/source/xyzsource.js b/src/ol/source/xyzsource.js
index 7294c312b2..7b8bdbb0c6 100644
--- a/src/ol/source/xyzsource.js
+++ b/src/ol/source/xyzsource.js
@@ -28,10 +28,10 @@ goog.require('ol.source.TileImage');
  * @api stable
  */
 ol.source.XYZ = function(options) {
-  var projection = goog.isDef(options.projection) ?
+  var projection = options.projection !== undefined ?
       options.projection : 'EPSG:3857';
 
-  var tileGrid = goog.isDef(options.tileGrid) ? options.tileGrid :
+  var tileGrid = options.tileGrid !== undefined ? options.tileGrid :
       ol.tilegrid.createXYZ({
         extent: ol.tilegrid.extentFromProjection(projection),
         maxZoom: options.maxZoom,
@@ -53,7 +53,7 @@ ol.source.XYZ = function(options) {
     tileLoadFunction: options.tileLoadFunction,
     tilePixelRatio: options.tilePixelRatio,
     tileUrlFunction: ol.TileUrlFunction.nullTileUrlFunction,
-    wrapX: goog.isDef(options.wrapX) ? options.wrapX : true
+    wrapX: options.wrapX !== undefined ? options.wrapX : true
   });
 
   if (options.tileUrlFunction !== undefined) {
diff --git a/src/ol/source/zoomifysource.js b/src/ol/source/zoomifysource.js
index 235b69fccb..ca2166d101 100644
--- a/src/ol/source/zoomifysource.js
+++ b/src/ol/source/zoomifysource.js
@@ -36,7 +36,7 @@ ol.source.Zoomify = function(opt_options) {
   var options = opt_options || {};
 
   var size = options.size;
-  var tierSizeCalculation = goog.isDef(options.tierSizeCalculation) ?
+  var tierSizeCalculation = options.tierSizeCalculation !== undefined ?
       options.tierSizeCalculation :
       ol.source.ZoomifyTierSizeCalculation.DEFAULT;
 
diff --git a/src/ol/style/atlasmanager.js b/src/ol/style/atlasmanager.js
index 33cc672112..01967f8bcd 100644
--- a/src/ol/style/atlasmanager.js
+++ b/src/ol/style/atlasmanager.js
@@ -47,7 +47,7 @@ ol.style.AtlasManager = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.currentSize_ = goog.isDef(options.initialSize) ?
+  this.currentSize_ = options.initialSize !== undefined ?
       options.initialSize : ol.INITIAL_ATLAS_SIZE;
 
   /**
@@ -55,9 +55,9 @@ ol.style.AtlasManager = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.maxSize_ = goog.isDef(options.maxSize) ?
+  this.maxSize_ = options.maxSize !== undefined ?
       options.maxSize : ol.MAX_ATLAS_SIZE != -1 ?
-          ol.MAX_ATLAS_SIZE : goog.isDef(ol.WEBGL_MAX_TEXTURE_SIZE) ?
+          ol.MAX_ATLAS_SIZE : ol.WEBGL_MAX_TEXTURE_SIZE !== undefined ?
               ol.WEBGL_MAX_TEXTURE_SIZE : 2048;
 
   /**
@@ -65,7 +65,7 @@ ol.style.AtlasManager = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.space_ = goog.isDef(options.space) ? options.space : 1;
+  this.space_ = options.space !== undefined ? options.space : 1;
 
   /**
    * @private
diff --git a/src/ol/style/circlestyle.js b/src/ol/style/circlestyle.js
index 9de1b18d4e..34eb334b87 100644
--- a/src/ol/style/circlestyle.js
+++ b/src/ol/style/circlestyle.js
@@ -50,13 +50,13 @@ ol.style.Circle = function(opt_options) {
    * @private
    * @type {ol.style.Fill}
    */
-  this.fill_ = goog.isDef(options.fill) ? options.fill : null;
+  this.fill_ = options.fill !== undefined ? options.fill : null;
 
   /**
    * @private
    * @type {ol.style.Stroke}
    */
-  this.stroke_ = goog.isDef(options.stroke) ? options.stroke : null;
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
 
   /**
    * @private
@@ -99,7 +99,7 @@ ol.style.Circle = function(opt_options) {
   /**
    * @type {boolean}
    */
-  var snapToPixel = goog.isDef(options.snapToPixel) ?
+  var snapToPixel = options.snapToPixel !== undefined ?
       options.snapToPixel : true;
 
   goog.base(this, {
@@ -435,7 +435,7 @@ ol.style.Circle.prototype.getChecksum = function() {
 
   if (recalculate) {
     var checksum = 'c' + strokeChecksum + fillChecksum +
-        (goog.isDef(this.radius_) ? this.radius_.toString() : '-');
+        (this.radius_ !== undefined ? this.radius_.toString() : '-');
     this.checksums_ = [checksum, strokeChecksum, fillChecksum, this.radius_];
   }
 
diff --git a/src/ol/style/fillstyle.js b/src/ol/style/fillstyle.js
index 19895f0c86..5b9d320bc7 100644
--- a/src/ol/style/fillstyle.js
+++ b/src/ol/style/fillstyle.js
@@ -22,7 +22,7 @@ ol.style.Fill = function(opt_options) {
    * @private
    * @type {ol.Color|string}
    */
-  this.color_ = goog.isDef(options.color) ? options.color : null;
+  this.color_ = options.color !== undefined ? options.color : null;
 
   /**
    * @private
diff --git a/src/ol/style/iconstyle.js b/src/ol/style/iconstyle.js
index df3d85452b..e65dc9b4b0 100644
--- a/src/ol/style/iconstyle.js
+++ b/src/ol/style/iconstyle.js
@@ -55,7 +55,7 @@ ol.style.Icon = function(opt_options) {
    * @private
    * @type {Array.<number>}
    */
-  this.anchor_ = goog.isDef(options.anchor) ? options.anchor : [0.5, 0.5];
+  this.anchor_ = options.anchor !== undefined ? options.anchor : [0.5, 0.5];
 
   /**
    * @private
@@ -67,38 +67,38 @@ ol.style.Icon = function(opt_options) {
    * @private
    * @type {ol.style.IconOrigin}
    */
-  this.anchorOrigin_ = goog.isDef(options.anchorOrigin) ?
+  this.anchorOrigin_ = options.anchorOrigin !== undefined ?
       options.anchorOrigin : ol.style.IconOrigin.TOP_LEFT;
 
   /**
    * @private
    * @type {ol.style.IconAnchorUnits}
    */
-  this.anchorXUnits_ = goog.isDef(options.anchorXUnits) ?
+  this.anchorXUnits_ = options.anchorXUnits !== undefined ?
       options.anchorXUnits : ol.style.IconAnchorUnits.FRACTION;
 
   /**
    * @private
    * @type {ol.style.IconAnchorUnits}
    */
-  this.anchorYUnits_ = goog.isDef(options.anchorYUnits) ?
+  this.anchorYUnits_ = options.anchorYUnits !== undefined ?
       options.anchorYUnits : ol.style.IconAnchorUnits.FRACTION;
 
   /**
    * @type {?string}
    */
   var crossOrigin =
-      goog.isDef(options.crossOrigin) ? options.crossOrigin : null;
+      options.crossOrigin !== undefined ? options.crossOrigin : null;
 
   /**
    * @type {Image}
    */
-  var image = goog.isDef(options.img) ? options.img : null;
+  var image = options.img !== undefined ? options.img : null;
 
   /**
    * @type {ol.Size}
    */
-  var imgSize = goog.isDef(options.imgSize) ? options.imgSize : null;
+  var imgSize = options.imgSize !== undefined ? options.imgSize : null;
 
   /**
    * @type {string|undefined}
@@ -123,7 +123,7 @@ ol.style.Icon = function(opt_options) {
   /**
    * @type {ol.style.ImageState}
    */
-  var imageState = goog.isDef(options.src) ?
+  var imageState = options.src !== undefined ?
       ol.style.ImageState.IDLE : ol.style.ImageState.LOADED;
 
   /**
@@ -137,13 +137,13 @@ ol.style.Icon = function(opt_options) {
    * @private
    * @type {Array.<number>}
    */
-  this.offset_ = goog.isDef(options.offset) ? options.offset : [0, 0];
+  this.offset_ = options.offset !== undefined ? options.offset : [0, 0];
 
   /**
    * @private
    * @type {ol.style.IconOrigin}
    */
-  this.offsetOrigin_ = goog.isDef(options.offsetOrigin) ?
+  this.offsetOrigin_ = options.offsetOrigin !== undefined ?
       options.offsetOrigin : ol.style.IconOrigin.TOP_LEFT;
 
   /**
@@ -156,33 +156,33 @@ ol.style.Icon = function(opt_options) {
    * @private
    * @type {ol.Size}
    */
-  this.size_ = goog.isDef(options.size) ? options.size : null;
+  this.size_ = options.size !== undefined ? options.size : null;
 
   /**
    * @type {number}
    */
-  var opacity = goog.isDef(options.opacity) ? options.opacity : 1;
+  var opacity = options.opacity !== undefined ? options.opacity : 1;
 
   /**
    * @type {boolean}
    */
-  var rotateWithView = goog.isDef(options.rotateWithView) ?
+  var rotateWithView = options.rotateWithView !== undefined ?
       options.rotateWithView : false;
 
   /**
    * @type {number}
    */
-  var rotation = goog.isDef(options.rotation) ? options.rotation : 0;
+  var rotation = options.rotation !== undefined ? options.rotation : 0;
 
   /**
    * @type {number}
    */
-  var scale = goog.isDef(options.scale) ? options.scale : 1;
+  var scale = options.scale !== undefined ? options.scale : 1;
 
   /**
    * @type {boolean}
    */
-  var snapToPixel = goog.isDef(options.snapToPixel) ?
+  var snapToPixel = options.snapToPixel !== undefined ?
       options.snapToPixel : true;
 
   goog.base(this, {
@@ -553,7 +553,7 @@ ol.style.IconImage_.prototype.getSrc = function() {
  */
 ol.style.IconImage_.prototype.load = function() {
   if (this.imageState_ == ol.style.ImageState.IDLE) {
-    goog.asserts.assert(goog.isDef(this.src_),
+    goog.asserts.assert(this.src_ !== undefined,
         'this.src_ must not be undefined');
     goog.asserts.assert(goog.isNull(this.imageListenerKeys_),
         'no listener keys existing');
diff --git a/src/ol/style/regularshapestyle.js b/src/ol/style/regularshapestyle.js
index 315f8f49cc..2994738547 100644
--- a/src/ol/style/regularshapestyle.js
+++ b/src/ol/style/regularshapestyle.js
@@ -30,7 +30,7 @@ goog.require('ol.style.Stroke');
 ol.style.RegularShape = function(options) {
 
   goog.asserts.assert(
-      goog.isDef(options.radius) || goog.isDef(options.radius1),
+      options.radius !== undefined || options.radius1 !== undefined,
       'must provide either "radius" or "radius1"');
 
   /**
@@ -55,7 +55,7 @@ ol.style.RegularShape = function(options) {
    * @private
    * @type {ol.style.Fill}
    */
-  this.fill_ = goog.isDef(options.fill) ? options.fill : null;
+  this.fill_ = options.fill !== undefined ? options.fill : null;
 
   /**
    * @private
@@ -73,7 +73,7 @@ ol.style.RegularShape = function(options) {
    * @private
    * @type {number}
    */
-  this.radius_ = /** @type {number} */ (goog.isDef(options.radius) ?
+  this.radius_ = /** @type {number} */ (options.radius !== undefined ?
       options.radius : options.radius1);
 
   /**
@@ -81,19 +81,19 @@ ol.style.RegularShape = function(options) {
    * @type {number}
    */
   this.radius2_ =
-      goog.isDef(options.radius2) ? options.radius2 : this.radius_;
+      options.radius2 !== undefined ? options.radius2 : this.radius_;
 
   /**
    * @private
    * @type {number}
    */
-  this.angle_ = goog.isDef(options.angle) ? options.angle : 0;
+  this.angle_ = options.angle !== undefined ? options.angle : 0;
 
   /**
    * @private
    * @type {ol.style.Stroke}
    */
-  this.stroke_ = goog.isDef(options.stroke) ? options.stroke : null;
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
 
   /**
    * @private
@@ -124,13 +124,13 @@ ol.style.RegularShape = function(options) {
   /**
    * @type {boolean}
    */
-  var snapToPixel = goog.isDef(options.snapToPixel) ?
+  var snapToPixel = options.snapToPixel !== undefined ?
       options.snapToPixel : true;
 
   goog.base(this, {
     opacity: 1,
     rotateWithView: false,
-    rotation: goog.isDef(options.rotation) ? options.rotation : 0,
+    rotation: options.rotation !== undefined ? options.rotation : 0,
     scale: 1,
     snapToPixel: snapToPixel
   });
@@ -536,10 +536,10 @@ ol.style.RegularShape.prototype.getChecksum = function() {
 
   if (recalculate) {
     var checksum = 'r' + strokeChecksum + fillChecksum +
-        (goog.isDef(this.radius_) ? this.radius_.toString() : '-') +
-        (goog.isDef(this.radius2_) ? this.radius2_.toString() : '-') +
-        (goog.isDef(this.angle_) ? this.angle_.toString() : '-') +
-        (goog.isDef(this.points_) ? this.points_.toString() : '-');
+        (this.radius_ !== undefined ? this.radius_.toString() : '-') +
+        (this.radius2_ !== undefined ? this.radius2_.toString() : '-') +
+        (this.angle_ !== undefined ? this.angle_.toString() : '-') +
+        (this.points_ !== undefined ? this.points_.toString() : '-');
     this.checksums_ = [checksum, strokeChecksum, fillChecksum,
       this.radius_, this.radius2_, this.angle_, this.points_];
   }
diff --git a/src/ol/style/strokestyle.js b/src/ol/style/strokestyle.js
index 1fbd7a9a02..230f32e1fc 100644
--- a/src/ol/style/strokestyle.js
+++ b/src/ol/style/strokestyle.js
@@ -27,7 +27,7 @@ ol.style.Stroke = function(opt_options) {
    * @private
    * @type {ol.Color|string}
    */
-  this.color_ = goog.isDef(options.color) ? options.color : null;
+  this.color_ = options.color !== undefined ? options.color : null;
 
   /**
    * @private
@@ -39,7 +39,7 @@ ol.style.Stroke = function(opt_options) {
    * @private
    * @type {Array.<number>}
    */
-  this.lineDash_ = goog.isDef(options.lineDash) ? options.lineDash : null;
+  this.lineDash_ = options.lineDash !== undefined ? options.lineDash : null;
 
   /**
    * @private
@@ -207,15 +207,15 @@ ol.style.Stroke.prototype.getChecksum = function() {
     var raw = 's' +
         (!goog.isNull(this.color_) ?
             ol.color.asString(this.color_) : '-') + ',' +
-        (goog.isDef(this.lineCap_) ?
+        (this.lineCap_ !== undefined ?
             this.lineCap_.toString() : '-') + ',' +
         (!goog.isNull(this.lineDash_) ?
             this.lineDash_.toString() : '-') + ',' +
-        (goog.isDef(this.lineJoin_) ?
+        (this.lineJoin_ !== undefined ?
             this.lineJoin_ : '-') + ',' +
-        (goog.isDef(this.miterLimit_) ?
+        (this.miterLimit_ !== undefined ?
             this.miterLimit_.toString() : '-') + ',' +
-        (goog.isDef(this.width_) ?
+        (this.width_ !== undefined ?
             this.width_.toString() : '-');
 
     var md5 = new goog.crypt.Md5();
diff --git a/src/ol/style/style.js b/src/ol/style/style.js
index 9b43147456..8cb9910baa 100644
--- a/src/ol/style/style.js
+++ b/src/ol/style/style.js
@@ -48,25 +48,25 @@ ol.style.Style = function(opt_options) {
    * @private
    * @type {ol.style.Fill}
    */
-  this.fill_ = goog.isDef(options.fill) ? options.fill : null;
+  this.fill_ = options.fill !== undefined ? options.fill : null;
 
   /**
    * @private
    * @type {ol.style.Image}
    */
-  this.image_ = goog.isDef(options.image) ? options.image : null;
+  this.image_ = options.image !== undefined ? options.image : null;
 
   /**
    * @private
    * @type {ol.style.Stroke}
    */
-  this.stroke_ = goog.isDef(options.stroke) ? options.stroke : null;
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
 
   /**
    * @private
    * @type {ol.style.Text}
    */
-  this.text_ = goog.isDef(options.text) ? options.text : null;
+  this.text_ = options.text !== undefined ? options.text : null;
 
   /**
    * @private
diff --git a/src/ol/style/textstyle.js b/src/ol/style/textstyle.js
index a8e127047b..f2ff125499 100644
--- a/src/ol/style/textstyle.js
+++ b/src/ol/style/textstyle.js
@@ -57,26 +57,26 @@ ol.style.Text = function(opt_options) {
    * @private
    * @type {ol.style.Fill}
    */
-  this.fill_ = goog.isDef(options.fill) ? options.fill :
+  this.fill_ = options.fill !== undefined ? options.fill :
       new ol.style.Fill({color: ol.style.Text.DEFAULT_FILL_COLOR_});
 
   /**
    * @private
    * @type {ol.style.Stroke}
    */
-  this.stroke_ = goog.isDef(options.stroke) ? options.stroke : null;
+  this.stroke_ = options.stroke !== undefined ? options.stroke : null;
 
   /**
    * @private
    * @type {number}
    */
-  this.offsetX_ = goog.isDef(options.offsetX) ? options.offsetX : 0;
+  this.offsetX_ = options.offsetX !== undefined ? options.offsetX : 0;
 
   /**
    * @private
    * @type {number}
    */
-  this.offsetY_ = goog.isDef(options.offsetY) ? options.offsetY : 0;
+  this.offsetY_ = options.offsetY !== undefined ? options.offsetY : 0;
 };
 
 
diff --git a/src/ol/tilegrid/tilegrid.js b/src/ol/tilegrid/tilegrid.js
index 8eb794267b..8d6073eb2a 100644
--- a/src/ol/tilegrid/tilegrid.js
+++ b/src/ol/tilegrid/tilegrid.js
@@ -36,7 +36,7 @@ ol.tilegrid.TileGrid = function(options) {
    * @protected
    * @type {number}
    */
-  this.minZoom = goog.isDef(options.minZoom) ? options.minZoom : 0;
+  this.minZoom = options.minZoom !== undefined ? options.minZoom : 0;
 
   /**
    * @private
@@ -57,7 +57,7 @@ ol.tilegrid.TileGrid = function(options) {
    * @private
    * @type {ol.Coordinate}
    */
-  this.origin_ = goog.isDef(options.origin) ? options.origin : null;
+  this.origin_ = options.origin !== undefined ? options.origin : null;
 
   /**
    * @private
@@ -97,7 +97,7 @@ ol.tilegrid.TileGrid = function(options) {
    * @private
    * @type {number|ol.Size}
    */
-  this.tileSize_ = goog.isDef(options.tileSize) ?
+  this.tileSize_ = options.tileSize !== undefined ?
       options.tileSize :
       goog.isNull(this.tileSizes_) ? ol.DEFAULT_TILE_SIZE : null;
   goog.asserts.assert(
diff --git a/src/ol/view.js b/src/ol/view.js
index b787868f9e..137fa94dd0 100644
--- a/src/ol/view.js
+++ b/src/ol/view.js
@@ -112,7 +112,7 @@ ol.View = function(opt_options) {
    * @type {Object.<string, *>}
    */
   var properties = {};
-  properties[ol.ViewProperty.CENTER] = goog.isDef(options.center) ?
+  properties[ol.ViewProperty.CENTER] = options.center !== undefined ?
       options.center : null;
 
   /**
@@ -161,7 +161,7 @@ ol.View = function(opt_options) {
         this.maxResolution_, options.zoom - this.minZoom_);
   }
   properties[ol.ViewProperty.ROTATION] =
-      goog.isDef(options.rotation) ? options.rotation : 0;
+      options.rotation !== undefined ? options.rotation : 0;
   this.setProperties(properties);
 };
 goog.inherits(ol.View, ol.Object);
@@ -458,10 +458,10 @@ ol.View.prototype.fit = function(geometry, size, opt_options) {
 
   var options = opt_options || {};
 
-  var padding = goog.isDef(options.padding) ? options.padding : [0, 0, 0, 0];
-  var constrainResolution = goog.isDef(options.constrainResolution) ?
+  var padding = options.padding !== undefined ? options.padding : [0, 0, 0, 0];
+  var constrainResolution = options.constrainResolution !== undefined ?
       options.constrainResolution : true;
-  var nearest = goog.isDef(options.nearest) ? options.nearest : false;
+  var nearest = options.nearest !== undefined ? options.nearest : false;
   var minResolution;
   if (options.minResolution !== undefined) {
     minResolution = options.minResolution;
@@ -662,13 +662,13 @@ ol.View.createResolutionConstraint_ = function(options) {
   var defaultMaxZoom = 28;
   var defaultZoomFactor = 2;
 
-  var minZoom = goog.isDef(options.minZoom) ?
+  var minZoom = options.minZoom !== undefined ?
       options.minZoom : ol.DEFAULT_MIN_ZOOM;
 
-  var maxZoom = goog.isDef(options.maxZoom) ?
+  var maxZoom = options.maxZoom !== undefined ?
       options.maxZoom : defaultMaxZoom;
 
-  var zoomFactor = goog.isDef(options.zoomFactor) ?
+  var zoomFactor = options.zoomFactor !== undefined ?
       options.zoomFactor : defaultZoomFactor;
 
   if (options.resolutions !== undefined) {
@@ -734,7 +734,7 @@ ol.View.createResolutionConstraint_ = function(options) {
  * @return {ol.RotationConstraintType} Rotation constraint.
  */
 ol.View.createRotationConstraint_ = function(options) {
-  var enableRotation = goog.isDef(options.enableRotation) ?
+  var enableRotation = options.enableRotation !== undefined ?
       options.enableRotation : true;
   if (enableRotation) {
     var constrainRotation = options.constrainRotation;
diff --git a/src/ol/xml.js b/src/ol/xml.js
index 622b18569e..b45fdbe183 100644
--- a/src/ol/xml.js
+++ b/src/ol/xml.js
@@ -194,7 +194,7 @@ ol.xml.isNode_ = function(value) {
  * @return {boolean} Is node.
  */
 ol.xml.isNodeIE_ = function(value) {
-  return goog.isObject(value) && goog.isDef(value.nodeType);
+  return goog.isObject(value) && value.nodeType !== undefined;
 };