Use named constants for magic numbers (#19992)

Mostly KeyboardEvent.which and MouseEvent.which values.

[skip validator]

1 files changed, 4 insertions, 2 deletions

diff --git a/js/src/carousel.js b/js/src/carousel.js
index 34cab4391..f990c699a 100644
--- a/js/src/carousel.js
+++ b/js/src/carousel.js
@@ -24,6 +24,8 @@ const Carousel = (($) => {
   const DATA_API_KEY        = '.data-api'
   const JQUERY_NO_CONFLICT  = $.fn[NAME]
   const TRANSITION_DURATION = 600
+  const ARROW_LEFT_KEYCODE  = 37 // KeyboardEvent.which value for left arrow key
+  const ARROW_RIGHT_KEYCODE = 39 // KeyboardEvent.which value for right arrow key
 
   const Default = {
     interval : 5000,
@@ -236,8 +238,8 @@ const Carousel = (($) => {
       }
 
       switch (event.which) {
-        case 37: this.prev(); break
-        case 39: this.next(); break
+        case ARROW_LEFT_KEYCODE: this.prev(); break
+        case ARROW_RIGHT_KEYCODE: this.next(); break
         default: return
       }
     }