Adds examples for Query String related utility functions;

Signed-off-by: Ashwin Hegde <ashwin.hegde3@gmail.com>

Author: hegdeashwin

Kit/Session-4/QueryString/queryString.js

@@ -0,0 +1,64 @@
+/***
+ * The goal of this file is to know about the query string functions;
+ * This module provides utilities for dealing with query strings..
+ *
+ * How to run this example:
+ * 1. node queryString.js
+ * 2. See the message get displayed on prompt.
+ */
+
+var queryString = require('querystring');
+/***
+ * 'foo=bar&baz=qux&baz=quux&corge='
+ */
+var qString = queryString.stringify({
+	email: 'ashwinh@cybage.com',
+	itemsCode: ['p001', 'p002'],
+	payment: true
+});
+
+console.log('\n');
+console.log(qString);
+console.log(typeof qString);
+
+console.log('\n');
+
+/***
+ * 'foo:bar;baz:qux'
+ */
+qString = queryString.stringify({
+	firstname: 'Ashwin',
+	lastname: 'Hegde'
+}, ';', ':');
+console.log(qString);
+console.log(typeof qString);
+
+console.log('\n');
+
+/***
+ * Escape method
+ */
+qString = queryString.escape('email=ashwinh@cybage.com&itemsCode=p001&itemsCode=p002&payment=true');
+console.log(qString);
+console.log(typeof qString);
+
+console.log('\n');
+
+/***
+ * Parsing foo=bar&baz=qux&baz=quux&corge
+ * Note: Options object may contain maxKeys property (equal to 1000 by default), 
+ * it'll be used to limit processed keys. 
+ * Set it to 0 to remove key count limitation.
+ */
+qString = queryString.parse('email=ashwinh%40cybage.com&itemsCode=p001&itemsCode=p002&payment=true');
+console.log('%j', qString);
+console.log(typeof qString);
+
+console.log('\n');
+
+/***
+ * Unescape method
+ */
+qString = queryString.unescape('email=ashwinh%40cybage.com&itemsCode=p001&itemsCode=p002&payment=true');
+console.log('%j', qString);
+console.log(typeof qString);