Replace repetitive if blocks with switch blocks

 
   document.addEventListener('keydown', ev => {
     if (mode == 'room') {
-      if (ev.key == 'w') {                              // w   TODO walk forward
-      } else if (ev.key == 'a') {                       // a   TODO strafe left
-      } else if (ev.key == 's') {                       // s   TODO walk backward
-      } else if (ev.key == 'd') {                       // d   TODO strafe right
-      } else if (ev.key == 'h') {                       // h   TODO pan left
-      } else if (ev.key == 'j') {                       // j   TODO scroll map down
-      } else if (ev.key == 'k') {                       // k   TODO scroll map up
-      } else if (ev.key == 'l') {                       // l   TODO pan right
+      switch (ev.key) {
+        case 'w': break                              // w   TODO walk forward
+        case 'a': break                              // a   TODO strafe left
+        case 's': break                              // s   TODO walk backward
+        case 'd': break                              // d   TODO strafe right
+        case 'h': break                              // h   TODO pan left
+        case 'j': break                              // j   TODO scroll map down
+        case 'k': break                              // k   TODO scroll map up
+        case 'l': break                              // l   TODO pan right
       }
       return
     }

       }
       return
     }
-    if (ev.ctrlKey && ev.key == '.') {                  // C^. toggle rhythm indicator
+    if (ev.ctrlKey && ev.key == '.') {               // C^. toggle rhythm indicator
       if (cookies.get('rhythm') == 'on') {
         document.querySelector('body').style.backgroundImage = 'none'
         cookies.set('rhythm', 'off')

         document.querySelector('body').style.backgroundImage = 'url(/static/measure.png)'
         cookies.set('rhythm', 'on')
       }
-    } else if (ev.key == '?') goHelp()                  // ?   show help
-    else if (ev.key == 'f') showKeyboardFollowLinks()   // f   show "follow links"
-    else if (ev.key == 'm') goHome()                    // m   go home
-    else if (ev.key == 'h') goBack()                    // h   go back
-    else if (ev.key == 'j') scrollDown()                // j   scroll down 3 EMs
-    else if (ev.key == 'k') scrollUp()                  // k   scroll up 3 EMs
-    else if (ev.key == 'l') goForward()                 // l   go forward
-    else if (ev.key == 'u') goUp()                      // u   follow rel=up
-    else if (ev.key == 'p') goPrevious()                // p   follow rel=prev
-    else if (ev.key == 'n') goNext()                    // n   follow rel=next
-    else if (ev.key == '[') pageUp()                    // [   scroll page up
-    else if (ev.key == ']') pageDown()                  // ]   scroll page down
-    else if (ev.key == '{') scrollTop()                 // {   scroll to top
-    else if (ev.key == '}') scrollBottom()              // }   scroll to bottom
+    } else {
+      switch (ev.key) {
+        case '?': goHelp(); break                    // ?   show help
+        case 'f': showKeyboardFollowLinks(); break   // f   show "follow links"
+        case 'm': goHome(); break                    // m   go home
+        case 'h': goBack(); break                    // h   go back
+        case 'j': scrollDown(); break                // j   scroll down 3 EMs
+        case 'k': scrollUp(); break                  // k   scroll up 3 EMs
+        case 'l': goForward(); break                 // l   go forward
+        case 'u': goUp(); break                      // u   follow rel=up
+        case 'p': goPrevious(); break                // p   follow rel=prev
+        case 'n': goNext(); break                    // n   follow rel=next
+        case '[': pageUp(); break                    // [   scroll page up
+        case ']': pageDown(); break                  // ]   scroll page down
+        case '{': scrollTop(); break                 // {   scroll to top
+        case '}': scrollBottom(); break              // }   scroll to bottom
+      }
+    }
   }, false)
 })
 

       document.querySelector('input[name=q]').value = query
       go(`/search?q=${query}`)
     } else if (input.startsWith('go')) {             // go
-      const where = input.slice(3)
-      if (where == 'home') goHome()                  //    home
-      else if (where == 'up') goUp()                 //    up
-      else if (where == 'prev') goPrevious()         //    prev
-      else if (where == 'next') goNext()             //    next
-      else if (where == 'back') goBack()             //    back
-      else if (where == 'forward') goForward()       //    forward
+      switch (input.slice(3)) {
+        case 'home': goHome(); break                 //    home
+        case 'up': goUp(); break                     //    up
+        case 'prev': goPrevious(); break             //    prev
+        case 'next': goNext(); break                 //    next
+        case 'back': goBack(); break                 //    back
+        case 'forward': goForward(); break           //    forward
+      }
     } else if (input.startsWith('follow')) {         // follow
       showVoiceFollowLinks()
     } else if (input.startsWith('tell me')) {        // tell me