Fixes from jshint

src/MarkerCluster.Default.js

@@ -1,4 +1,4 @@
-(function () {
+(function () {
 	L.MarkerClusterDefault = {
 		iconCreateFunction: function (childCount) {
 			var c = ' marker-cluster-';

src/MarkerCluster.Spiderfier.js

@@ -1,4 +1,4 @@
-//This code is 100% based on https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet
+//This code is 100% based on https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet
 //Huge thanks to jawj for implementing it first to make my job easy :-)
 
 L.MarkerCluster.include({
@@ -15,7 +15,7 @@ L.MarkerCluster.include({
 								// 0 -> always spiral; Infinity -> always circle
 
 	spiderfy: function () {
-		if (this._group._spiderfied == this) {
+		if (this._group._spiderfied === this) {
 			return;
 		}
 
@@ -85,6 +85,7 @@ L.MarkerCluster.include(!L.DomUtil.TRANSITION ? {
 	//Non Animated versions of everything
 	_animationSpiderfy: function (childMarkers, positions) {
 		var group = this._group,
+			map = group._map,
 			i, m, leg;
 
 		for (i = childMarkers.length - 1; i >= 0; i--) {
@@ -128,6 +129,7 @@ L.MarkerCluster.include(!L.DomUtil.TRANSITION ? {
 	_animationSpiderfy: function (childMarkers, positions) {
 		var me = this,
 			group = this._group,
+			map = group._map,
 			i, m, leg;
 
 		for (i = childMarkers.length - 1; i >= 0; i--) {
@@ -284,5 +286,5 @@ L.MarkerClusterGroup.include({
 		if (this._spiderfied) {
 			this._spiderfied.unspiderfy();
 		}
-	},
+	}
 });

src/MarkerCluster.js

@@ -149,7 +149,7 @@ L.MarkerCluster = L.Marker.extend({
 
 		//Check our children
 		for (i = markers.length - 1; i >= 0; i--) {
-			if (markers[i] == layer) {
+			if (markers[i] === layer) {
 				if (markers[i]._icon) {
 					L.FeatureGroup.prototype.removeLayer.call(group, markers[i]);
 				}
@@ -255,7 +255,7 @@ L.MarkerCluster = L.Marker.extend({
 	_recursivelyAddChildrenToMap: function (startPos, depth, bounds) {
 		this._recursively(bounds, 0, depth,
 			function (c, recursionDepth) {
-				if (recursionDepth == 0) {
+				if (recursionDepth === 0) {
 					return;
 				}
 
@@ -362,7 +362,7 @@ L.MarkerCluster = L.Marker.extend({
 			if (runAtEveryLevel) {
 				runAtEveryLevel(this, timesToRecurse);
 			}
-			if (timesToRecurse == 0 && runAtBottomLevel) {
+			if (timesToRecurse === 0 && runAtBottomLevel) {
 				runAtBottomLevel(this);
 			}
 
@@ -399,6 +399,6 @@ L.MarkerCluster = L.Marker.extend({
 	//Returns true if we are the parent of only one cluster and that cluster is the same as us
 	_isSingleParent: function () {
 		//Don't need to check this._markers as the rest won't work if there are any
-		return this._childClusters.length > 0 && this._childClusters[0]._childCount == this._childCount;
+		return this._childClusters.length > 0 && this._childClusters[0]._childCount === this._childCount;
 	}
 });

src/MarkerClusterGroup.js

@@ -258,7 +258,7 @@ L.MarkerClusterGroup.include(!L.DomUtil.TRANSITION ? {
 	},
 	_animationAddLayer: function (layer, newCluster) {
 		L.FeatureGroup.prototype.addLayer.call(this, newCluster);
-		if (newCluster != layer && newCluster._childCount == 2) {
+		if (newCluster !== layer && newCluster._childCount === 2) {
 			newCluster._recursivelyRemoveChildrenFromMap(newCluster._bounds, 1);
 		}
 	}
@@ -269,7 +269,7 @@ L.MarkerClusterGroup.include(!L.DomUtil.TRANSITION ? {
 		this._map._mapPane.className += ' leaflet-cluster-anim';
 	},
 	_animationEnd: function () {
-		this._map._mapPane.className = map._mapPane.className.replace(' leaflet-cluster-anim', '');
+		this._map._mapPane.className = this._map._mapPane.className.replace(' leaflet-cluster-anim', '');
 		this._inZoomAnimation--;
 	},
 	_animationZoomIn: function (previousZoomLevel, newZoomLevel) {
@@ -285,7 +285,7 @@ L.MarkerClusterGroup.include(!L.DomUtil.TRANSITION ? {
 				markers = c._markers,
 				m;
 
-			if (c._isSingleParent() && depthToDescend == 1) { //Immediately add the new child and remove us
+			if (c._isSingleParent() && depthToDescend === 1) { //Immediately add the new child and remove us
 				L.FeatureGroup.prototype.removeLayer.call(me, c);
 				c._recursivelyAddChildrenToMap(null, depthToDescend, bounds);
 			} else {
@@ -307,16 +307,20 @@ L.MarkerClusterGroup.include(!L.DomUtil.TRANSITION ? {
 
 		//Immediately fire an event to update the opacity and locations (If we immediately set it they won't animate)
 		setTimeout(function () {
+			var j, n;
+
 			//Update opacities
 			me._topClusterLevel._recursivelyBecomeVisible(bounds, depthToStartAt + depthToDescend);
 			//TODO Maybe? Update markers in _recursivelyBecomeVisible
-			for (i in me._layers) {
-				var n = me._layers[i];
+			for (j in me._layers) {
+				if (this._layers.hasOwnProperty(j)) {
+					n = me._layers[j];
 
 					if (!(n instanceof L.MarkerCluster) && n._icon) {
 						n.setOpacity(1);
 					}
 				}
+			}
 
 			//update the positions of the just added clusters/markers
 			me._topClusterLevel._recursively(bounds, depthToStartAt, 0, function (c) {
@@ -376,7 +380,7 @@ L.MarkerClusterGroup.include(!L.DomUtil.TRANSITION ? {
 		var me = this;
 
 		L.FeatureGroup.prototype.addLayer.call(this, layer);
-		if (newCluster != layer) {
+		if (newCluster !== layer) {
 			if (newCluster._childCount > 2) { //Was already a cluster
 
 				this._animationStart();