4.1 done

4.1object/t2.js

@@ -0,0 +1,12 @@
+function isEmpty(obj){
+    let flag = 0;
+    for(key in obj){
+        flag = 1;
+    }
+    return flag == 0 ? false : true;
+}
+
+let schedule = {};
+alert(isEmpty(schedule));
+schedule["9:30"] = "get up"
+alert(isEmpty(schedule));