added setTimeout example for printing 1 to 5 after each and every second

Author: theriyazo

All Lessons/setTimeout.js

@@ -1,8 +1,20 @@
+// print 1 to 5 after each and every second
+// for example 1 after 1sec, 2 after 2sec, 3 after 3sec and so on upto 5.
+
 function x(){
-    var i = 10;
-    setTimeout(function (){
-        console.log(i);
-    }, 3000);
+    for (var i=0; i<5; i++){
+        setTimeout(function (){
+            console.log(i);
+        }, i* 1000);
+    }
+    
     console.log("Hello JavaScript!");
 }
-x();
+x();
+
+// Notes:
+// the following code doesnt work it only prints 5,5,5,5,5
+// Because till it waits for 1sec the value of i has become 5
+// and since each time the i is refered to the same memory the latest value is 5(because of closure).
+
+// to avoid this we can use block scope variable which has unique value