[O] Make cache() a function

src/logic/utils/cache-utils.ts

@@ -1,20 +1,17 @@
 
-export default class CacheUtils
+const cacheMap: Map<string, any> = new Map();
+
+/**
+ * Get a cached value, or if not cached, cache it.
+ *
+ * @param name Name of the cached value
+ * @param callback Callback function
+ */
+export default function cache(name: string, callback: () => any)
 {
-    map: Map<string, any> = new Map();
-
-    /**
-     * Get a cached value, or if not cached, cache it.
-     *
-     * @param name Name of the cached value
-     * @param callback Callback function
-     */
-    public get(name: string, callback: () => any)
+    if (cacheMap.has(name))
     {
-        if (!this.map.has(name))
-        {
-            this.map.set(name, callback());
-        }
-        return this.map.get(name);
+        cacheMap.set(name, callback());
     }
+    return cacheMap.get(name);
 }