improved es6 code

Gruntfile.js

@@ -39,11 +39,11 @@ module.exports = function( grunt ) {
 		babel: {
 			options: {
 				sourceMap: true,
-				presets: ['env']
+				presets: ["env"]
 			},
 			dist: {
 				files: {
-					'dist/jquery.selectpicker-tree.js': 'dist/jquery.selectpicker-tree.js'
+					"dist/jquery.selectpicker-tree.js": "dist/jquery.selectpicker-tree.js"
 				}
 			}
 		},

src/jquery.selectpicker-tree.js

@@ -1,4 +1,4 @@
-;( function( $, window, document ) {
+( ( $, window, document ) => {
 	const pluginName = "selectpickerTree";
 	const defaults = {
 		data: [],
@@ -12,38 +12,41 @@
 	}
 
 	$.extend( Plugin.prototype, {
-		init: function() {
-			console.log( this.element );
+		init() {
 			$( document ).ready( () => {
 				this.addSelectpicker( this.settings.data, this.settings.metadata );
 			} );
 		},
-		addSelectpicker: function( data, metadata ) {
+		addSelectpicker( data, metadata ) {
 			const formGroup = this.createFormGroupWithLabel( metadata.label );
-			const selectpicker = $( `<select class="selectpicker form-control"></select>` );
-			data.map( child => this.createOption( child, metadata ) )
-				.forEach( option => selectpicker.append( option ) );
+			const selectpicker = $( "<select class=\"selectpicker form-control\"></select>" );
+			data.map( ( child ) => this.createOption( child, metadata ) )
+				.forEach( ( option ) => selectpicker.append( option ) );
 			formGroup.append( selectpicker );
 			$( this.element ).append( formGroup );
 
 			this.initSelectpicker( selectpicker, metadata.options );
 		},
-		createFormGroupWithLabel: function( label ) {
-			const formGroup = $( `<div class="form-group"></div>` );
-			if ( label !== undefined ) {
+		createFormGroupWithLabel( label ) {
+			const formGroup = $( "<div class=\"form-group\"></div>" );
+			if ( typeof label !== "undefined" ) {
 				formGroup.append( $( `<label>${label}</label>` ) );
 			}
 			return formGroup;
 		},
-		createOption: function( child, metadata = {} ) {
-			const optionName = typeof child === "string" ?
-				child : child[ metadata.name ? metadata.name : "name" ];
+		createOption( child, metadata = {} ) {
+			let optionName;
+			if ( typeof child === "string" ) {
+				optionName = child;
+			} else {
+				optionName = child[ metadata.name ? metadata.name : "name" ];
+			}
 			const option = $( `<option>${optionName}</option>` );
 			option.data( "data", child[ metadata.children ? metadata.children : "items" ] );
 			option.data( "metadata", metadata.child ? metadata.child : {} );
 			return option;
 		},
-		initSelectpicker: function( selectpicker, options ) {
+		initSelectpicker( selectpicker, options ) {
 			selectpicker.selectpicker( this.getSelectpickerOptions( options ) );
 			const plugin = this;
 			selectpicker.on( "changed.bs.select", function( event ) {
@@ -54,12 +57,12 @@
 				}
 			} );
 		},
-		getSelectpickerOptions: function( options ) {
+		getSelectpickerOptions( options ) {
 			const defaultOptions = {
 				liveSearch: true
 			};
 			options = options ? options : defaultOptions;
-			if ( options.title === undefined ) {
+			if ( typeof options.title === "undefined" ) {
 				options.title = "Choose one...";
 			}
 			return options;
@@ -68,8 +71,7 @@
 	$.fn[ pluginName ] = function( options ) {
 		return this.each( function() {
 			if ( !$.data( this, "plugin_" + pluginName ) ) {
-				$.data( this, "plugin_" +
-					pluginName, new Plugin( this, options ) );
+				$.data( this, "plugin_" + pluginName, new Plugin( this, options ) );
 			}
 		} );
 	};