From bc5f14ebdec0a9023545a32b0600891d2d02da4a Mon Sep 17 00:00:00 2001
From: Ali Movahedi <ali_movahedi@aol.com>
Date: Tue, 12 Sep 2017 18:39:09 +0430
Subject: [PATCH] fix: move optional argument to end

---
 src/index.js | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/src/index.js b/src/index.js
index d469ed3..719766f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -117,12 +117,7 @@ export default class Bot extends EventEmitter {
    *                           gets the update
    * @return {object} returns the bot object
    */
-  command(command, customMessage, listener) {
-    if (!listener) {
-      listener = customMessage;
-      customMessage = {};
-    }
-
+  command(command, listener, customMessage = {}) {
     const regex = /[^\s]+/;
 
     const cmd = command.match(regex)[0].trim();
@@ -130,8 +125,8 @@ export default class Bot extends EventEmitter {
     this._userEvents.push({
       pattern: new RegExp(`^/${cmd}`),
       parse: argumentParser.bind(null, command),
-      customMessage,
-      listener
+      listener,
+      customMessage
     });
 
     return this;