diff --git a/src/ol/reproj/image.js b/src/ol/reproj/image.js
index ac0ea5d403..a4abd4760b 100644
--- a/src/ol/reproj/image.js
+++ b/src/ol/reproj/image.js
@@ -43,8 +43,8 @@ ol.reproj.Image = function(sourceProj, targetProj,
   this.maxSourceExtent_ = sourceProj.getExtent();
   var maxTargetExtent = targetProj.getExtent();
 
-  var limitedTargetExtent = goog.isNull(maxTargetExtent) ?
-      targetExtent : ol.extent.getIntersection(targetExtent, maxTargetExtent);
+  var limitedTargetExtent = maxTargetExtent ?
+      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;
 
   var targetCenter = ol.extent.getCenter(limitedTargetExtent);
   var sourceResolution = ol.reproj.calculateSourceResolution(
@@ -84,8 +84,7 @@ ol.reproj.Image = function(sourceProj, targetProj,
    * @private
    * @type {number}
    */
-  this.srcPixelRatio_ =
-      !goog.isNull(this.srcImage_) ? this.srcImage_.getPixelRatio() : 1;
+  this.srcPixelRatio_ = this.srcImage_ ? this.srcImage_.getPixelRatio() : 1;
 
   /**
    * @private
@@ -103,7 +102,7 @@ ol.reproj.Image = function(sourceProj, targetProj,
   var state = ol.ImageState.LOADED;
   var attributions = [];
 
-  if (!goog.isNull(this.srcImage_)) {
+  if (this.srcImage_) {
     state = ol.ImageState.IDLE;
     attributions = this.srcImage_.getAttributions();
   }
@@ -195,7 +194,7 @@ ol.reproj.Image.prototype.load = function() {
  * @private
  */
 ol.reproj.Image.prototype.unlistenSource_ = function() {
-  goog.asserts.assert(!goog.isNull(this.sourceListenerKey_),
+  goog.asserts.assert(this.sourceListenerKey_,
       'this.sourceListenerKey_ should not be null');
   goog.events.unlistenByKey(this.sourceListenerKey_);
   this.sourceListenerKey_ = null;
diff --git a/src/ol/reproj/reproj.js b/src/ol/reproj/reproj.js
index 67abb0234e..4de2495b0d 100644
--- a/src/ol/reproj/reproj.js
+++ b/src/ol/reproj/reproj.js
@@ -1,6 +1,5 @@
 goog.provide('ol.reproj');
 
-goog.require('goog.array');
 goog.require('goog.labs.userAgent.browser');
 goog.require('goog.labs.userAgent.platform');
 goog.require('goog.math');
@@ -117,8 +116,7 @@ ol.reproj.render = function(width, height, pixelRatio,
 
   context.scale(pixelRatio, pixelRatio);
 
-  var wrapXShiftDistance = !goog.isNull(sourceExtent) ?
-      ol.extent.getWidth(sourceExtent) : 0;
+  var wrapXShiftDistance = sourceExtent ? ol.extent.getWidth(sourceExtent) : 0;
 
   var wrapXType = ol.reproj.WrapXRendering_.NONE;
 
@@ -137,7 +135,7 @@ ol.reproj.render = function(width, height, pixelRatio,
   }
 
   var srcDataExtent = ol.extent.createEmpty();
-  goog.array.forEach(sources, function(src, i, arr) {
+  sources.forEach(function(src, i, arr) {
     if (wrapXType == ol.reproj.WrapXRendering_.STITCH_SHIFT) {
       var srcW = src.extent[2] - src.extent[0];
       var srcX = goog.math.modulo(src.extent[0], wrapXShiftDistance);
@@ -147,7 +145,7 @@ ol.reproj.render = function(width, height, pixelRatio,
       ol.extent.extend(srcDataExtent, src.extent);
     }
   });
-  if (!goog.isNull(sourceExtent)) {
+  if (sourceExtent) {
     if (wrapXType == ol.reproj.WrapXRendering_.NONE) {
       srcDataExtent[0] = ol.math.clamp(
           srcDataExtent[0], sourceExtent[0], sourceExtent[2]);
@@ -177,7 +175,7 @@ ol.reproj.render = function(width, height, pixelRatio,
                       pixelRatio / sourceResolution);
   stitchContext.translate(-srcDataExtent[0], srcDataExtent[3]);
 
-  goog.array.forEach(sources, function(src, i, arr) {
+  sources.forEach(function(src, i, arr) {
     var xPos = src.extent[0];
     var yPos = -src.extent[3];
     var srcWidth = ol.extent.getWidth(src.extent);
@@ -196,7 +194,7 @@ ol.reproj.render = function(width, height, pixelRatio,
 
   var targetTL = ol.extent.getTopLeft(targetExtent);
 
-  goog.array.forEach(triangulation.getTriangles(), function(tri, i, arr) {
+  triangulation.getTriangles().forEach(function(tri, i, arr) {
     context.save();
 
     /* Calculate affine transform (src -> dst)
@@ -263,7 +261,7 @@ ol.reproj.render = function(width, height, pixelRatio,
       [0, 0, x2, y2, v2 - v0]
     ];
     var coefs = ol.math.solveLinearSystem(augmentedMatrix);
-    if (goog.isNull(coefs)) {
+    if (!coefs) {
       return;
     }
 
@@ -303,8 +301,7 @@ ol.reproj.render = function(width, height, pixelRatio,
     context.strokeStyle = 'black';
     context.lineWidth = 1;
 
-    goog.array.forEach(triangulation.getTriangles(), function(tri, i, arr) {
-
+    triangulation.getTriangles().forEach(function(tri, i, arr) {
       var tgt = tri.target;
       var u0 = (tgt[0][0] - targetTL[0]) / targetResolution,
           v0 = -(tgt[0][1] - targetTL[1]) / targetResolution;
diff --git a/src/ol/reproj/tile.js b/src/ol/reproj/tile.js
index 0de6c3bf20..cca4031593 100644
--- a/src/ol/reproj/tile.js
+++ b/src/ol/reproj/tile.js
@@ -1,6 +1,5 @@
 goog.provide('ol.reproj.Tile');
 
-goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.events');
 goog.require('goog.events.EventType');
@@ -99,8 +98,8 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
   var maxTargetExtent = this.targetTileGrid_.getExtent();
   var maxSourceExtent = this.sourceTileGrid_.getExtent();
 
-  var limitedTargetExtent = goog.isNull(maxTargetExtent) ?
-      targetExtent : ol.extent.getIntersection(targetExtent, maxTargetExtent);
+  var limitedTargetExtent = maxTargetExtent ?
+      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;
 
   if (ol.extent.getArea(limitedTargetExtent) === 0) {
     // Tile is completely outside range -> EMPTY
@@ -110,8 +109,8 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
   }
 
   var sourceProjExtent = sourceProj.getExtent();
-  if (!goog.isNull(sourceProjExtent)) {
-    if (goog.isNull(maxSourceExtent)) {
+  if (sourceProjExtent) {
+    if (!maxSourceExtent) {
       maxSourceExtent = sourceProjExtent;
     } else {
       maxSourceExtent = ol.extent.getIntersection(
@@ -152,7 +151,7 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
   this.srcZ_ = sourceTileGrid.getZForResolution(sourceResolution);
   var srcExtent = this.triangulation_.calculateSourceExtent();
 
-  if (!goog.isNull(maxSourceExtent) &&
+  if (maxSourceExtent &&
       !this.triangulation_.getWrapsXInSource() &&
       !ol.extent.intersects(maxSourceExtent, srcExtent)) {
     this.state = ol.TileState.EMPTY;
@@ -160,25 +159,31 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
     var srcRange = sourceTileGrid.getTileRangeForExtentAndZ(
         srcExtent, this.srcZ_);
 
-    var xRange;
+    var xRange = [];
     var srcFullRange = sourceTileGrid.getFullTileRange(this.srcZ_);
-    if (!goog.isNull(srcFullRange)) {
+    if (srcFullRange) {
       srcRange.minY = Math.max(srcRange.minY, srcFullRange.minY);
       srcRange.maxY = Math.min(srcRange.maxY, srcFullRange.maxY);
 
       if (srcRange.minX > srcRange.maxX) {
-        xRange = goog.array.concat(
-            goog.array.range(srcRange.minX, srcFullRange.maxX + 1),
-            goog.array.range(srcFullRange.minX, srcRange.maxX + 1)
-            );
+        var i;
+        for (i = srcRange.minX; i <= srcFullRange.maxX; i++) {
+          xRange.push(i);
+        }
+        for (i = srcFullRange.minX; i <= srcRange.maxX; i++) {
+          xRange.push(i);
+        }
       } else {
-        xRange = goog.array.range(
-            Math.max(srcRange.minX, srcFullRange.minX),
-            Math.min(srcRange.maxX, srcFullRange.maxX) + 1
-            );
+        var first = Math.max(srcRange.minX, srcFullRange.minX);
+        var last = Math.min(srcRange.maxX, srcFullRange.maxX);
+        for (var j = first; j <= last; j++) {
+          xRange.push(j);
+        }
       }
     } else {
-      xRange = goog.array.range(srcRange.minX, srcRange.maxX + 1);
+      for (var k = srcRange.minX; k <= srcRange.maxX; k++) {
+        xRange.push(k);
+      }
     }
 
     var tilesRequired = xRange.length * srcRange.getHeight();
@@ -187,7 +192,7 @@ ol.reproj.Tile = function(sourceProj, sourceTileGrid,
       this.state = ol.TileState.ERROR;
       return;
     }
-    goog.array.forEach(xRange, function(srcX, i, arr) {
+    xRange.forEach(function(srcX, i, arr) {
       for (var srcY = srcRange.minY; srcY <= srcRange.maxY; srcY++) {
         var tile = getTileFunction(this.srcZ_, srcX, srcY, pixelRatio);
         if (tile) {
@@ -242,7 +247,7 @@ ol.reproj.Tile.prototype.getImage = function(opt_context) {
  */
 ol.reproj.Tile.prototype.reproject_ = function() {
   var sources = [];
-  goog.array.forEach(this.srcTiles_, function(tile, i, arr) {
+  this.srcTiles_.forEach(function(tile, i, arr) {
     if (tile && tile.getState() == ol.TileState.LOADED) {
       sources.push({
         extent: this.sourceTileGrid_.getTileCoordExtent(tile.tileCoord),
@@ -280,11 +285,11 @@ ol.reproj.Tile.prototype.load = function() {
 
     var leftToLoad = 0;
 
-    goog.asserts.assert(goog.isNull(this.sourcesListenerKeys_),
+    goog.asserts.assert(!this.sourcesListenerKeys_,
         'this.sourcesListenerKeys_ should be null');
 
     this.sourcesListenerKeys_ = [];
-    goog.array.forEach(this.srcTiles_, function(tile, i, arr) {
+    this.srcTiles_.forEach(function(tile, i, arr) {
       var state = tile.getState();
       if (state == ol.TileState.IDLE || state == ol.TileState.LOADING) {
         leftToLoad++;
@@ -310,7 +315,7 @@ ol.reproj.Tile.prototype.load = function() {
       }
     }, this);
 
-    goog.array.forEach(this.srcTiles_, function(tile, i, arr) {
+    this.srcTiles_.forEach(function(tile, i, arr) {
       var state = tile.getState();
       if (state == ol.TileState.IDLE) {
         tile.load();
@@ -328,8 +333,8 @@ ol.reproj.Tile.prototype.load = function() {
  * @private
  */
 ol.reproj.Tile.prototype.unlistenSources_ = function() {
-  goog.asserts.assert(!goog.isNull(this.sourcesListenerKeys_),
+  goog.asserts.assert(this.sourcesListenerKeys_,
       'this.sourcesListenerKeys_ should not be null');
-  goog.array.forEach(this.sourcesListenerKeys_, goog.events.unlistenByKey);
+  this.sourcesListenerKeys_.forEach(goog.events.unlistenByKey);
   this.sourcesListenerKeys_ = null;
 };
diff --git a/src/ol/reproj/triangulation.js b/src/ol/reproj/triangulation.js
index 2edd3d455d..dc95b77b6d 100644
--- a/src/ol/reproj/triangulation.js
+++ b/src/ol/reproj/triangulation.js
@@ -1,6 +1,5 @@
 goog.provide('ol.reproj.Triangulation');
 
-goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.math');
 goog.require('ol.extent');
@@ -96,8 +95,8 @@ ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
    * @private
    */
   this.canWrapXInSource_ = this.sourceProj_.canWrapX() &&
-      !goog.isNull(maxSourceExtent) &&
-      !goog.isNull(this.sourceProj_.getExtent()) &&
+      !!maxSourceExtent &&
+      !!this.sourceProj_.getExtent() &&
       (ol.extent.getWidth(maxSourceExtent) ==
        ol.extent.getWidth(this.sourceProj_.getExtent()));
 
@@ -105,14 +104,14 @@ ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
    * @type {?number}
    * @private
    */
-  this.sourceWorldWidth_ = !goog.isNull(this.sourceProj_.getExtent()) ?
+  this.sourceWorldWidth_ = this.sourceProj_.getExtent() ?
       ol.extent.getWidth(this.sourceProj_.getExtent()) : null;
 
   /**
    * @type {?number}
    * @private
    */
-  this.targetWorldWidth_ = !goog.isNull(this.targetProj_.getExtent()) ?
+  this.targetWorldWidth_ = this.targetProj_.getExtent() ?
       ol.extent.getWidth(this.targetProj_.getExtent()) : null;
 
   var tlDst = ol.extent.getTopLeft(targetExtent);
@@ -171,7 +170,7 @@ ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
     aSrc, bSrc, cSrc, dSrc, maxSubdiv) {
 
   var srcQuadExtent = ol.extent.boundingExtent([aSrc, bSrc, cSrc, dSrc]);
-  var srcCoverageX = !goog.isNull(this.sourceWorldWidth_) ?
+  var srcCoverageX = this.sourceWorldWidth_ ?
       ol.extent.getWidth(srcQuadExtent) / this.sourceWorldWidth_ : null;
 
   // when the quad is wrapped in the source projection
@@ -182,18 +181,18 @@ ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
   var needsSubdivision = false;
 
   if (maxSubdiv > 0) {
-    if (this.targetProj_.isGlobal() && !goog.isNull(this.targetWorldWidth_)) {
+    if (this.targetProj_.isGlobal() && this.targetWorldWidth_) {
       var tgtQuadExtent = ol.extent.boundingExtent([a, b, c, d]);
       var tgtCoverageX =
           ol.extent.getWidth(tgtQuadExtent) / this.targetWorldWidth_;
       needsSubdivision |= tgtCoverageX > ol.RASTER_REPROJ_MAX_TRIANGLE_WIDTH;
     }
-    if (!wrapsX && this.sourceProj_.isGlobal() && !goog.isNull(srcCoverageX)) {
+    if (!wrapsX && this.sourceProj_.isGlobal() && srcCoverageX) {
       needsSubdivision |= srcCoverageX > ol.RASTER_REPROJ_MAX_TRIANGLE_WIDTH;
     }
   }
 
-  if (!needsSubdivision && !goog.isNull(this.maxSourceExtent_)) {
+  if (!needsSubdivision && this.maxSourceExtent_) {
     if (!ol.extent.intersects(srcQuadExtent, this.maxSourceExtent_)) {
       // whole quad outside source projection extent -> ignore
       return;
@@ -220,7 +219,7 @@ ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
 
       var dx;
       if (wrapsX) {
-        goog.asserts.assert(!goog.isNull(this.sourceWorldWidth_));
+        goog.asserts.assert(this.sourceWorldWidth_);
         var centerSrcEstimX =
             (goog.math.modulo(aSrc[0], this.sourceWorldWidth_) +
              goog.math.modulo(cSrc[0], this.sourceWorldWidth_)) / 2;
@@ -278,7 +277,7 @@ ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
  * @return {ol.Extent} Calculated extent.
  */
 ol.reproj.Triangulation.prototype.calculateSourceExtent = function() {
-  if (!goog.isNull(this.trianglesSourceExtent_)) {
+  if (this.trianglesSourceExtent_) {
     return this.trianglesSourceExtent_;
   }
 
@@ -289,8 +288,8 @@ ol.reproj.Triangulation.prototype.calculateSourceExtent = function() {
     // all coordinates need to be "shifted" to be positive
     // to properly calculate the extent (and then possibly shifted back)
 
-    goog.array.forEach(this.triangles_, function(triangle, i, arr) {
-      goog.asserts.assert(!goog.isNull(this.sourceWorldWidth_));
+    this.triangles_.forEach(function(triangle, i, arr) {
+      goog.asserts.assert(this.sourceWorldWidth_);
       var src = triangle.source;
       ol.extent.extendCoordinate(extent,
           [goog.math.modulo(src[0][0], this.sourceWorldWidth_), src[0][1]]);
@@ -309,7 +308,7 @@ ol.reproj.Triangulation.prototype.calculateSourceExtent = function() {
       extent[2] -= this.sourceWorldWidth_;
     }
   } else {
-    goog.array.forEach(this.triangles_, function(triangle, i, arr) {
+    this.triangles_.forEach(function(triangle, i, arr) {
       var src = triangle.source;
       ol.extent.extendCoordinate(extent, src[0]);
       ol.extent.extendCoordinate(extent, src[1]);
diff --git a/src/ol/source/imagesource.js b/src/ol/source/imagesource.js
index e0ac8486a2..a0a4b4cb09 100644
--- a/src/ol/source/imagesource.js
+++ b/src/ol/source/imagesource.js
@@ -110,15 +110,15 @@ ol.source.Image.prototype.getImage =
     function(extent, resolution, pixelRatio, projection) {
   var sourceProjection = this.getProjection();
   if (!ol.ENABLE_RASTER_REPROJECTION ||
-      !goog.isDefAndNotNull(sourceProjection) ||
-      !goog.isDefAndNotNull(projection) ||
+      !sourceProjection ||
+      !projection ||
       ol.proj.equivalent(sourceProjection, projection)) {
-    if (!goog.isNull(sourceProjection)) {
+    if (sourceProjection) {
       projection = sourceProjection;
     }
     return this.getImageInternal(extent, resolution, pixelRatio, projection);
   } else {
-    if (!goog.isNull(this.reprojectedImage_)) {
+    if (this.reprojectedImage_) {
       if (this.reprojectedRevision_ == this.getRevision() &&
           ol.proj.equivalent(
               this.reprojectedImage_.getProjection(), projection) &&
diff --git a/src/ol/source/tileimagesource.js b/src/ol/source/tileimagesource.js
index e94df1793c..964e7d7690 100644
--- a/src/ol/source/tileimagesource.js
+++ b/src/ol/source/tileimagesource.js
@@ -152,8 +152,8 @@ ol.source.TileImage.prototype.getTileGridForProjection = function(projection) {
     return goog.base(this, 'getTileGridForProjection', projection);
   }
   var thisProj = this.getProjection();
-  if (!goog.isNull(this.tileGrid) &&
-      (goog.isNull(thisProj) || ol.proj.equivalent(thisProj, projection))) {
+  if (this.tileGrid &&
+      (!thisProj || ol.proj.equivalent(thisProj, projection))) {
     return this.tileGrid;
   } else {
     var projKey = goog.getUid(projection).toString();
@@ -174,7 +174,7 @@ ol.source.TileImage.prototype.getTileCacheForProjection = function(projection) {
     return goog.base(this, 'getTileCacheForProjection', projection);
   }
   var thisProj = this.getProjection();
-  if (goog.isNull(thisProj) || ol.proj.equivalent(thisProj, projection)) {
+  if (!thisProj || ol.proj.equivalent(thisProj, projection)) {
     return this.tileCache;
   } else {
     var projKey = goog.getUid(projection).toString();
@@ -192,8 +192,8 @@ ol.source.TileImage.prototype.getTileCacheForProjection = function(projection) {
 ol.source.TileImage.prototype.getTile =
     function(z, x, y, pixelRatio, projection) {
   if (!ol.ENABLE_RASTER_REPROJECTION ||
-      !goog.isDefAndNotNull(this.getProjection()) ||
-      !goog.isDefAndNotNull(projection) ||
+      !this.getProjection() ||
+      !projection ||
       ol.proj.equivalent(this.getProjection(), projection)) {
     return this.getTileInternal(z, x, y, pixelRatio, projection);
   } else {
@@ -335,7 +335,7 @@ ol.source.TileImage.prototype.setTileGridForProjection =
     function(projection, tilegrid) {
   if (ol.ENABLE_RASTER_REPROJECTION) {
     var proj = ol.proj.get(projection);
-    if (!goog.isNull(proj)) {
+    if (proj) {
       var projKey = goog.getUid(proj).toString();
       if (!(projKey in this.tileGridForProjection)) {
         this.tileGridForProjection[projKey] = tilegrid;
@@ -380,7 +380,7 @@ ol.source.TileImage.prototype.setTileUrlFunction = function(tileUrlFunction) {
 ol.source.TileImage.prototype.useTile = function(z, x, y, projection) {
   var tileCache = this.getTileCacheForProjection(projection);
   var tileCoordKey = this.getKeyZXY(z, x, y);
-  if (!goog.isNull(tileCache) && tileCache.containsKey(tileCoordKey)) {
+  if (tileCache && tileCache.containsKey(tileCoordKey)) {
     tileCache.get(tileCoordKey);
   }
 };
diff --git a/src/ol/source/tilesource.js b/src/ol/source/tilesource.js
index cda201384c..e47afe0d3f 100644
--- a/src/ol/source/tilesource.js
+++ b/src/ol/source/tilesource.js
@@ -103,7 +103,7 @@ ol.source.Tile.prototype.canExpireCache = function() {
  */
 ol.source.Tile.prototype.expireCache = function(projection, usedTiles) {
   var tileCache = this.getTileCacheForProjection(projection);
-  if (!goog.isNull(tileCache)) {
+  if (tileCache) {
     tileCache.expireCache(usedTiles);
   }
 };
@@ -121,7 +121,7 @@ ol.source.Tile.prototype.expireCache = function(projection, usedTiles) {
 ol.source.Tile.prototype.forEachLoadedTile =
     function(projection, z, tileRange, callback) {
   var tileCache = this.getTileCacheForProjection(projection);
-  if (goog.isNull(tileCache)) {
+  if (!tileCache) {
     return false;
   }
 
@@ -222,7 +222,7 @@ ol.source.Tile.prototype.getTileGridForProjection = function(projection) {
  */
 ol.source.Tile.prototype.getTileCacheForProjection = function(projection) {
   var thisProj = this.getProjection();
-  if (!goog.isNull(thisProj) && !ol.proj.equivalent(thisProj, projection)) {
+  if (thisProj && !ol.proj.equivalent(thisProj, projection)) {
     return null;
   } else {
     return this.tileCache;