refactor: small simplification

Author: Keuklar

src/content/datachannel/basic/js/main.js

@@ -148,17 +148,15 @@ function onReceiveMessageCallback(event) {
 }
 
 function onSendChannelStateChange() {
-  const readyState = sendChannel.readyState;
+  const { readyState } = sendChannel;
   console.log('Send channel state is: ' + readyState);
-  if (readyState === 'open') {
-    dataChannelSend.disabled = false;
+  const isChannelClosed = readyState !== 'open';
+  const elementsToDisable = [dataChannelSend, sendButton, closeButton];
+  elementsToDisable.forEach(element => {
+    element.disabled = isChannelClosed;
+  });
+  if (!isChannelClosed) {
     dataChannelSend.focus();
-    sendButton.disabled = false;
-    closeButton.disabled = false;
-  } else {
-    dataChannelSend.disabled = true;
-    sendButton.disabled = true;
-    closeButton.disabled = true;
   }
 }