1 files changed, 32 insertions, 33 deletions

diff --git a/ext/mixed/js/display.js b/ext/mixed/js/display.js
index 9d3dc51b..ab0674a9 100644
--- a/ext/mixed/js/display.js
+++ b/ext/mixed/js/display.js
@@ -193,9 +193,8 @@ class Display {
 
     onKeyDown(e) {
         const key = Display.getKeyFromEvent(e);
-        const handlers = Display.onKeyDownHandlers;
-        if (hasOwn(handlers, key)) {
-            const handler = handlers[key];
+        const handler = Display._onKeyDownHandlers.get(key);
+        if (typeof handler === 'function') {
             if (handler(this, e)) {
                 e.preventDefault();
                 return true;
@@ -766,101 +765,101 @@ class Display {
     }
 }
 
-Display.onKeyDownHandlers = {
-    'Escape': (self) => {
+Display._onKeyDownHandlers = new Map([
+    ['Escape', (self) => {
         self.onSearchClear();
         return true;
-    },
+    }],
 
-    'PageUp': (self, e) => {
+    ['PageUp', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(self.index - 3, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'PageDown': (self, e) => {
+    ['PageDown', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(self.index + 3, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'End': (self, e) => {
+    ['End', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(self.definitions.length - 1, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'Home': (self, e) => {
+    ['Home', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(0, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'ArrowUp': (self, e) => {
+    ['ArrowUp', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(self.index - 1, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'ArrowDown': (self, e) => {
+    ['ArrowDown', (self, e) => {
         if (e.altKey) {
             self.entryScrollIntoView(self.index + 1, null, true);
             return true;
         }
         return false;
-    },
+    }],
 
-    'B': (self, e) => {
+    ['B', (self, e) => {
         if (e.altKey) {
             self.sourceTermView();
             return true;
         }
         return false;
-    },
+    }],
 
-    'F': (self, e) => {
+    ['F', (self, e) => {
         if (e.altKey) {
             self.nextTermView();
             return true;
         }
         return false;
-    },
+    }],
 
-    'E': (self, e) => {
+    ['E', (self, e) => {
         if (e.altKey) {
             self.noteTryAdd('term-kanji');
             return true;
         }
         return false;
-    },
+    }],
 
-    'K': (self, e) => {
+    ['K', (self, e) => {
         if (e.altKey) {
             self.noteTryAdd('kanji');
             return true;
         }
         return false;
-    },
+    }],
 
-    'R': (self, e) => {
+    ['R', (self, e) => {
         if (e.altKey) {
             self.noteTryAdd('term-kana');
             return true;
         }
         return false;
-    },
+    }],
 
-    'P': (self, e) => {
+    ['P', (self, e) => {
         if (e.altKey) {
             const entry = self.getEntry(self.index);
             if (entry !== null && entry.dataset.type === 'term') {
@@ -869,16 +868,16 @@ Display.onKeyDownHandlers = {
             return true;
         }
         return false;
-    },
+    }],
 
-    'V': (self, e) => {
+    ['V', (self, e) => {
         if (e.altKey) {
             self.noteTryView();
             return true;
         }
         return false;
-    }
-};
+    }]
+]);
 
 Display._runtimeMessageHandlers = new Map([
     ['optionsUpdate', (self) => self.updateOptions(null)]