Skip removeTransition if there is already no .playing class

padi · padi · commit e3b4261d93e7 · 2016-12-11T22:08:11.000+08:00
diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
@@ -69,6 +69,7 @@
 
   function removeTransition(e) {
     if(e.propertyName !== 'transform') return; // skip it if it's not a transform
+    if(!this.classList.contains('playing')) return; // skip if the transition if moving from ".playing" to not ".playing"
     this.classList.remove('playing');
   }
 

Original file line number	Diff line number	Diff line change
`@@ -69,6 +69,7 @@`
`69`	`69`
`70`	`70`	`function removeTransition(e) {`
`71`	`71`	`if(e.propertyName !== 'transform') return; // skip it if it's not a transform`
	`72`	`+ if(!this.classList.contains('playing')) return; // skip if the transition if moving from ".playing" to not ".playing"`
`72`	`73`	`this.classList.remove('playing');`
`73`	`74`	`}`
`74`	`75`