Update Join.ts

Author: morrisjdev

dev/Modules/Join.ts

@@ -1,11 +1,11 @@
 Array.prototype.Join = function <T>(this: T[], char: string, selector?: ((item: T) => any) | string): string {
     let that: T[] = this;
 
-    let array: any[] = [];
+    let array: any[] = that;
 
     if (selector != null) {
         array = that.Select(selector);
     }
 
     return array.join(char);
-};
+};