Refactor JSONCookies function for improved readability and modern syntax

- Replaced Object.keys() with Object.entries() for cleaner iteration over key-value pairs.
- Utilized destructuring in the loop to enhance code clarity.
- Improved variable naming for better understanding of the decoded value.
- Maintained functionality of decoding JSON cookies while updating the original object.

index.js

@@ -101,16 +101,11 @@ function JSONCookie (str) {
  */
 
 function JSONCookies (obj) {
-  var cookies = Object.keys(obj)
-  var key
-  var val
-
-  for (var i = 0; i < cookies.length; i++) {
-    key = cookies[i]
-    val = JSONCookie(obj[key])
+  for (const [key, value] of Object.entries(obj)) {
+    const decodedValue = JSONCookie(value)
 
-    if (val) {
-      obj[key] = val
+    if (decodedValue) {
+      obj[key] = decodedValue
     }
   }