events: improve for-loop

PR-URL: nodejs#26354
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>

Author: gengjiawen

lib/events.js

@@ -391,10 +391,7 @@ EventEmitter.prototype.removeAllListeners =
 
       // Emit removeListener for all listeners on all events
       if (arguments.length === 0) {
-        var keys = Object.keys(events);
-        var key;
-        for (i = 0; i < keys.length; ++i) {
-          key = keys[i];
+        for (const key of Object.keys(events)) {
           if (key === 'removeListener') continue;
           this.removeAllListeners(key);
         }