on and off aliases added

README.md

@@ -93,7 +93,9 @@ timer.addEventListener('secondsUpdated', function (e) {
     * Parameters:
         * eventType (string): The type of the event that you want to listen.
         * callback (function): Function that will be executed when the timer triggers the specified event. The callback receives an object with the timer as a parameter.
+* on(eventType, callback): addEventListener alias.
 * removeEventListener(eventType, callback): Remove an event listener from the timer. Same usage as addEventListener.
+* off(eventType, callback): removeEventListener alias.
 * getTimeValues(): Returns an object with the current values. The keys of the returned object are 'secondTenths', 'seconds', 'minutes', 'hours' and 'days'.
 * getTotalTimeValues(): Returns an object with the current absolute values. The keys of the returned object are 'secondTenths', 'seconds', 'minutes', 'hours' and 'days'.
 

index.d.ts

@@ -28,7 +28,9 @@ declare module "easytimer" {
         reset(): void;
         pause(): void;
         addEventListener(event: Event, listener: () => void): void;
+        on(event: Event, listener: () => void): void;
         removeEventListener(event: Event, listener: () => void): void;
+        off(event: Event, listener: () => void): void;
         dispatchEvent(event: string): void;
         isRunning(): boolean;
         isPaused(): boolean;

src/easytimer/easytimer.js

@@ -1,8 +1,4 @@
 /**
- * @license easytimer.js v2.0.0
- * Created by Albert González
- * Licensed under The MIT License.
- *
  * @class Timer
  */
 
@@ -507,7 +503,11 @@ function Timer () {
 
     this.addEventListener = addEventListener;
 
+    this.on = addEventListener;
+
     this.removeEventListener = removeEventListener;
+
+    this.off = removeEventListener;
   }
 };
 

test/timer.spec.js

@@ -842,5 +842,17 @@ describe('timer.js', function () {
         sinon.assert.callCount(secondsUpdatedListener, 6);
       });
     });
+
+    describe('on function', () => {
+      it('should be an alias of addEventListener', () => {
+        assert.equal(timer.addEventListener, timer.on);
+      });
+    });
+
+    describe('off function', () => {
+      it('should be an alias of removeEventListener', () => {
+        assert.equal(timer.removeEventListener, timer.off);
+      });
+    });
   });
 });