Minor refactoring of PR #15770

public/app/features/dashboard/state/DashboardModel.ts

@@ -919,16 +919,18 @@ export class DashboardModel {
   }
 
   toggleLegendsForAll() {
-    const panels = this.panels.filter(panel => {
+    const panelsWithLegends = this.panels.filter(panel => {
       return panel.legend !== undefined && panel.legend !== null;
     });
+
     // determine if more panels are displaying legends or not
-    const onCount = panels.filter(panel => panel.legend.show).length;
-    const offCount = panels.length - onCount;
+    const onCount = panelsWithLegends.filter(panel => panel.legend.show).length;
+    const offCount = panelsWithLegends.length - onCount;
     const panelLegendsOn = onCount >= offCount;
-    panels.forEach(panel => {
+
+    for (const panel of panelsWithLegends) {
       panel.legend.show = !panelLegendsOn;
       panel.render();
-    });
+    }
   }
 }