collapse: merge class toggling

diff --git a/js/src/collapse.js b/js/src/collapse.js
index 68046e1a6b41994ff04d0b4d98ae381c0e32e515..8894342dfc29a7ac5b26b8ba28298a75fa10cfc0 100644 (file)
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -249,12 +249,7 @@ class Collapse extends BaseComponent {
     }
 
     for (const element of triggerArray) {
-      if (isOpen) {
-        element.classList.remove(CLASS_NAME_COLLAPSED)
-      } else {
-        element.classList.add(CLASS_NAME_COLLAPSED)
-      }
-
+      element.classList.toggle(CLASS_NAME_COLLAPSED, !isOpen)
       element.setAttribute('aria-expanded', isOpen)
     }
   }