diff --git a/src/ol/interaction/DragAndDrop.js b/src/ol/interaction/DragAndDrop.js
index e337181c52..397b03f375 100644
--- a/src/ol/interaction/DragAndDrop.js
+++ b/src/ol/interaction/DragAndDrop.js
@@ -128,12 +128,10 @@ inherits(DragAndDrop, Interaction);
  */
 function handleDrop(event) {
   const files = event.dataTransfer.files;
-  let i, ii, file;
-  for (i = 0, ii = files.length; i < ii; ++i) {
-    file = files.item(i);
+  for (let i = 0, ii = files.length; i < ii; ++i) {
+    const file = files.item(i);
     const reader = new FileReader();
-    reader.addEventListener(EventType.LOAD,
-      this.handleResult_.bind(this, file));
+    reader.addEventListener(EventType.LOAD, this.handleResult_.bind(this, file));
     reader.readAsText(file);
   }
 }
@@ -165,8 +163,7 @@ DragAndDrop.prototype.handleResult_ = function(file, event) {
 
   const formatConstructors = this.formatConstructors_;
   let features = [];
-  let i, ii;
-  for (i = 0, ii = formatConstructors.length; i < ii; ++i) {
+  for (let i = 0, ii = formatConstructors.length; i < ii; ++i) {
     /**
      * Avoid "cannot instantiate abstract class" error.
      * @type {Function}
@@ -202,14 +199,10 @@ DragAndDrop.prototype.registerListeners_ = function() {
   if (map) {
     const dropArea = this.target ? this.target : map.getViewport();
     this.dropListenKeys_ = [
-      listen(dropArea, EventType.DROP,
-        handleDrop, this),
-      listen(dropArea, EventType.DRAGENTER,
-        handleStop, this),
-      listen(dropArea, EventType.DRAGOVER,
-        handleStop, this),
-      listen(dropArea, EventType.DROP,
-        handleStop, this)
+      listen(dropArea, EventType.DROP, handleDrop, this),
+      listen(dropArea, EventType.DRAGENTER, handleStop, this),
+      listen(dropArea, EventType.DRAGOVER, handleStop, this),
+      listen(dropArea, EventType.DROP, handleStop, this)
     ];
   }
 };
diff --git a/src/ol/interaction/Modify.js b/src/ol/interaction/Modify.js
index 99175c1c20..08c318f8cb 100644
--- a/src/ol/interaction/Modify.js
+++ b/src/ol/interaction/Modify.js
@@ -465,10 +465,9 @@ Modify.prototype.writePointGeometry_ = function(feature, geometry) {
  */
 Modify.prototype.writeMultiPointGeometry_ = function(feature, geometry) {
   const points = geometry.getCoordinates();
-  let coordinates, i, ii, segmentData;
-  for (i = 0, ii = points.length; i < ii; ++i) {
-    coordinates = points[i];
-    segmentData = /** @type {ol.ModifySegmentDataType} */ ({
+  for (let i = 0, ii = points.length; i < ii; ++i) {
+    const coordinates = points[i];
+    const segmentData = /** @type {ol.ModifySegmentDataType} */ ({
       feature: feature,
       geometry: geometry,
       depth: [i],
@@ -487,10 +486,9 @@ Modify.prototype.writeMultiPointGeometry_ = function(feature, geometry) {
  */
 Modify.prototype.writeLineStringGeometry_ = function(feature, geometry) {
   const coordinates = geometry.getCoordinates();
-  let i, ii, segment, segmentData;
-  for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
-    segment = coordinates.slice(i, i + 2);
-    segmentData = /** @type {ol.ModifySegmentDataType} */ ({
+  for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+    const segment = coordinates.slice(i, i + 2);
+    const segmentData = /** @type {ol.ModifySegmentDataType} */ ({
       feature: feature,
       geometry: geometry,
       index: i,
@@ -508,12 +506,11 @@ Modify.prototype.writeLineStringGeometry_ = function(feature, geometry) {
  */
 Modify.prototype.writeMultiLineStringGeometry_ = function(feature, geometry) {
   const lines = geometry.getCoordinates();
-  let coordinates, i, ii, j, jj, segment, segmentData;
-  for (j = 0, jj = lines.length; j < jj; ++j) {
-    coordinates = lines[j];
-    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
-      segment = coordinates.slice(i, i + 2);
-      segmentData = /** @type {ol.ModifySegmentDataType} */ ({
+  for (let j = 0, jj = lines.length; j < jj; ++j) {
+    const coordinates = lines[j];
+    for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      const segment = coordinates.slice(i, i + 2);
+      const segmentData = /** @type {ol.ModifySegmentDataType} */ ({
         feature: feature,
         geometry: geometry,
         depth: [j],
@@ -533,12 +530,11 @@ Modify.prototype.writeMultiLineStringGeometry_ = function(feature, geometry) {
  */
 Modify.prototype.writePolygonGeometry_ = function(feature, geometry) {
   const rings = geometry.getCoordinates();
-  let coordinates, i, ii, j, jj, segment, segmentData;
-  for (j = 0, jj = rings.length; j < jj; ++j) {
-    coordinates = rings[j];
-    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
-      segment = coordinates.slice(i, i + 2);
-      segmentData = /** @type {ol.ModifySegmentDataType} */ ({
+  for (let j = 0, jj = rings.length; j < jj; ++j) {
+    const coordinates = rings[j];
+    for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+      const segment = coordinates.slice(i, i + 2);
+      const segmentData = /** @type {ol.ModifySegmentDataType} */ ({
         feature: feature,
         geometry: geometry,
         depth: [j],
@@ -558,14 +554,13 @@ Modify.prototype.writePolygonGeometry_ = function(feature, geometry) {
  */
 Modify.prototype.writeMultiPolygonGeometry_ = function(feature, geometry) {
   const polygons = geometry.getCoordinates();
-  let coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
-  for (k = 0, kk = polygons.length; k < kk; ++k) {
-    rings = polygons[k];
-    for (j = 0, jj = rings.length; j < jj; ++j) {
-      coordinates = rings[j];
-      for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
-        segment = coordinates.slice(i, i + 2);
-        segmentData = /** @type {ol.ModifySegmentDataType} */ ({
+  for (let k = 0, kk = polygons.length; k < kk; ++k) {
+    const rings = polygons[k];
+    for (let j = 0, jj = rings.length; j < jj; ++j) {
+      const coordinates = rings[j];
+      for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
+        const segment = coordinates.slice(i, i + 2);
+        const segmentData = /** @type {ol.ModifySegmentDataType} */ ({
           feature: feature,
           geometry: geometry,
           depth: [j, k],
@@ -811,11 +806,9 @@ function handleDragEvent(evt) {
  * @this {ol.interaction.Modify}
  */
 function handleUpEvent(evt) {
-  let segmentData;
-  let geometry;
   for (let i = this.dragSegments_.length - 1; i >= 0; --i) {
-    segmentData = this.dragSegments_[i][0];
-    geometry = segmentData.geometry;
+    const segmentData = this.dragSegments_[i][0];
+    const geometry = segmentData.geometry;
     if (geometry.getType() === GeometryType.CIRCLE) {
       // Update a circle object in the R* bush:
       const coordinates = geometry.getCenter();
@@ -826,13 +819,11 @@ function handleUpEvent(evt) {
       this.rBush_.update(createOrUpdateFromCoordinate(coordinates), centerSegmentData);
       this.rBush_.update(geometry.getExtent(), circumferenceSegmentData);
     } else {
-      this.rBush_.update(boundingExtent(segmentData.segment),
-        segmentData);
+      this.rBush_.update(boundingExtent(segmentData.segment), segmentData);
     }
   }
   if (this.modified_) {
-    this.dispatchEvent(new ModifyEvent(
-      ModifyEventType.MODIFYEND, this.features_, evt));
+    this.dispatchEvent(new ModifyEvent(ModifyEventType.MODIFYEND, this.features_, evt));
     this.modified_ = false;
   }
   return false;
@@ -927,9 +918,8 @@ Modify.prototype.handlePointerAtPixel_ = function(pixel, map) {
           vertex = squaredDist1 > squaredDist2 ? closestSegment[1] : closestSegment[0];
         }
         this.createOrUpdateVertexFeature_(vertex);
-        let segment;
         for (let i = 1, ii = nodes.length; i < ii; ++i) {
-          segment = nodes[i].segment;
+          const segment = nodes[i].segment;
           if ((coordinatesEqual(closestSegment[0], segment[0]) &&
               coordinatesEqual(closestSegment[1], segment[1]) ||
               (coordinatesEqual(closestSegment[0], segment[1]) &&
diff --git a/src/ol/interaction/Select.js b/src/ol/interaction/Select.js
index 4bef1e1c5d..5df6eced18 100644
--- a/src/ol/interaction/Select.js
+++ b/src/ol/interaction/Select.js
@@ -269,11 +269,11 @@ function handleEvent(mapBrowserEvent) {
     clear(this.featureLayerAssociation_);
     map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
       (
-      /**
-           * @param {ol.Feature|ol.render.Feature} feature Feature.
-           * @param {ol.layer.Layer} layer Layer.
-           * @return {boolean|undefined} Continue to iterate over the features.
-           */
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @param {ol.layer.Layer} layer Layer.
+         * @return {boolean|undefined} Continue to iterate over the features.
+         */
         function(feature, layer) {
           if (this.filter_(feature, layer)) {
             selected.push(feature);
@@ -284,8 +284,7 @@ function handleEvent(mapBrowserEvent) {
         layerFilter: this.layerFilter_,
         hitTolerance: this.hitTolerance_
       });
-    let i;
-    for (i = features.getLength() - 1; i >= 0; --i) {
+    for (let i = features.getLength() - 1; i >= 0; --i) {
       const feature = features.item(i);
       const index = selected.indexOf(feature);
       if (index > -1) {
@@ -303,11 +302,11 @@ function handleEvent(mapBrowserEvent) {
     // Modify the currently selected feature(s).
     map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
       (
-      /**
-           * @param {ol.Feature|ol.render.Feature} feature Feature.
-           * @param {ol.layer.Layer} layer Layer.
-           * @return {boolean|undefined} Continue to iterate over the features.
-           */
+        /**
+         * @param {ol.Feature|ol.render.Feature} feature Feature.
+         * @param {ol.layer.Layer} layer Layer.
+         * @return {boolean|undefined} Continue to iterate over the features.
+         */
         function(feature, layer) {
           if (this.filter_(feature, layer)) {
             if ((add || toggle) && !includes(features.getArray(), feature)) {
@@ -323,8 +322,7 @@ function handleEvent(mapBrowserEvent) {
         layerFilter: this.layerFilter_,
         hitTolerance: this.hitTolerance_
       });
-    let j;
-    for (j = deselected.length - 1; j >= 0; --j) {
+    for (let j = deselected.length - 1; j >= 0; --j) {
       features.remove(deselected[j]);
     }
     features.extend(selected);