style(arrow functions): adds the nice ES6 arrow-function syntax for c…

…allbacks

.jscsrc

@@ -5,5 +5,6 @@
     "tests/**/assets",
     "node_modules/**"
   ],
-  "disallowConstOutsideModuleScope": false
+  "disallowConstOutsideModuleScope": false,
+  "requireArrowFunctions": true,
 }

src/input/touch.js

@@ -74,7 +74,7 @@ function getTouches(ev, type) {
   let { target } = this;
 
   // get target touches from touches
-  targetTouches = allTouches.filter(function(touch) {
+  targetTouches = allTouches.filter((touch) => {
     return hasParent(touch.target, target);
   });
 

src/main.js

@@ -128,7 +128,7 @@ freeGlobal.Hammer = Hammer;
 
 /* jshint ignore:start */
 if (typeof define === 'function' && define.amd) {
-  define(function() {
+  define(() => {
     return Hammer;
   });
 } else if (typeof module !== 'undefined' && module.exports) {

src/manager.js

@@ -41,7 +41,7 @@ function Manager(element, options) {
 
   toggleCssProps(this, true);
 
-  each(this.options.recognizers, function(item) {
+  each(this.options.recognizers, (item) => {
     let recognizer = this.add(new (item[0])(item[1]));
     item[2] && recognizer.recognizeWith(item[2]);
     item[3] && recognizer.requireFailure(item[3]);
@@ -226,7 +226,7 @@ Manager.prototype = {
     }
 
     let { handlers } = this;
-    each(splitStr(events), function(event) {
+    each(splitStr(events), (event) => {
       handlers[event] = handlers[event] || [];
       handlers[event].push(handler);
     });
@@ -245,7 +245,7 @@ Manager.prototype = {
     }
 
     let { handlers } = this;
-    each(splitStr(events), function(event) {
+    each(splitStr(events), (event) => {
       if (!handler) {
         delete handlers[event];
       } else {
@@ -311,7 +311,7 @@ function toggleCssProps(manager, add) {
     return;
   }
   let prop;
-  each(manager.options.cssProps, function(value, name) {
+  each(manager.options.cssProps, (value, name) => {
     prop = prefixed(element.style, name);
     if (add) {
       manager.oldCssProps[prop] = element.style[prop];

src/recognizers/press.js

@@ -58,7 +58,7 @@ inherit(PressRecognizer, Recognizer, {
       this.reset();
     } else if (input.eventType & INPUT_START) {
       this.reset();
-      this._timer = setTimeoutContext(function() {
+      this._timer = setTimeoutContext(() => {
         this.state = STATE_RECOGNIZED;
         this.tryEmit();
       }, options.time, this);

src/recognizers/tap.js

@@ -97,7 +97,7 @@ inherit(TapRecognizer, Recognizer, {
         if (!this.hasRequireFailures()) {
           return STATE_RECOGNIZED;
         } else {
-          this._timer = setTimeoutContext(function() {
+          this._timer = setTimeoutContext(() => {
             this.state = STATE_RECOGNIZED;
             this.tryEmit();
           }, options.interval, this);
@@ -109,7 +109,7 @@ inherit(TapRecognizer, Recognizer, {
   },
 
   failTimeout() {
-    this._timer = setTimeoutContext(function() {
+    this._timer = setTimeoutContext(() => {
       this.state = STATE_FAILED;
     }, this.options.interval, this);
     return STATE_FAILED;

src/touchactionjs/get-touchaction-props.js

@@ -6,11 +6,11 @@ export default function getTouchActionProps() {
   }
   let touchMap = {};
   let cssSupports = window.CSS && window.CSS.supports;
-  ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach(function(val) {
+  ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach((val) => {
 
     // If css.supports is not supported but there is native touch-action assume it supports
     // all values. This is the case for IE 10 and 11.
-    touchMap[val] = cssSupports ? window.CSS.supports('touch-action', val) : true;
+    return touchMap[val] = cssSupports ? window.CSS.supports('touch-action', val) : true;
   });
   return touchMap;
 }

src/touchactionjs/touchaction-constructor.js

@@ -62,7 +62,7 @@ TouchAction.prototype = {
    */
   compute() {
     let actions = [];
-    each(this.manager.recognizers, function(recognizer) {
+    each(this.manager.recognizers, (recognizer) => {
       if (boolOrFn(recognizer.options.enable, [recognizer])) {
         actions = actions.concat(recognizer.getTouchAction());
       }

src/utils/add-event-listeners.js

@@ -8,7 +8,7 @@ import splitStr from './split-str';
  * @param {Function} handler
  */
 export default function addEventListeners(target, types, handler) {
-  each(splitStr(types), function(type) {
+  each(splitStr(types), (type) => {
     target.addEventListener(type, handler, false);
   });
 }

src/utils/extend.js

@@ -8,7 +8,7 @@ import deprecate from './deprecate';
  * @param {Boolean} [merge=false]
  * @returns {Object} dest
  */
-const extend = deprecate(function extend(dest, src, merge) {
+const extend = deprecate((dest, src, merge) => {
   let keys = Object.keys(src);
   let i = 0;
   while (i < keys.length) {

src/utils/merge.js

@@ -8,7 +8,7 @@ import extend from './extend';
  * @param {Object} src
  * @returns {Object} dest
  */
-const merge = deprecate(function merge(dest, src) {
+const merge = deprecate((dest, src) => {
   return extend(dest, src, true);
 }, 'merge', 'Use `assign`.');
 

src/utils/remove-event-listeners.js

@@ -8,7 +8,7 @@ import splitStr from './split-str';
  * @param {Function} handler
  */
 export default function removeEventListeners(target, types, handler) {
-  each(splitStr(types), function(type) {
+  each(splitStr(types), (type) => {
     target.removeEventListener(type, handler, false);
   });
 }

src/utils/unique-array.js

@@ -26,7 +26,7 @@ export default function uniqueArray(src, key, sort) {
     if (!key) {
       results = results.sort();
     } else {
-      results = results.sort(function sortUniqueArray(a, b) {
+      results = results.sort((a, b) => {
         return a[key] > b[key];
       });
     }