Removed hash_map class

codes/typescript/chapter_hashing/hash_map.ts

@@ -4,8 +4,7 @@
  * Author: Daniel (better.sunjian@gmail.com)
  */
 
-class hash_map {
-    constructor() {
+/* Driver Code */
 /* 初始化哈希表 */
 const map = new Map<number, string>();
 
@@ -43,7 +42,3 @@ class hash_map {
 for (const v of map.values()) {
     console.info(v);
 }
-    }
-}
-
-export {};