diff --git a/sort.js b/sort.js
index 76988be..973fc7c 100644
--- a/sort.js
+++ b/sort.js
@@ -1,2 +1,12 @@
-var number = [19, 3, 81, 1, 24, 21]
+var sortNumber = function (number) {
+  number.sort(function (a, b) {
+    if (a === b) {
+      return 0;
+    }
+    return a < b ? -1 : 1;
+  });
+};
+
+var number = [19, 3, 81, 1, 24, 21];
+sortNumber(number);
 console.log(number);