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AJAX tutorial AJAX is a developer's dream, because you can:  Update a web page without reloading the page Request data from a server - after the page has loaded Receive data from a server - after the page has loaded Send data to a server - in the background What is AJAX? AJAX = Asynchronous JavaScript And XML.  AJAX is not a programming language.  AJAX just uses a combination of:   A browser built-in XMLHttpRequest object (to request data from a web server) JavaScript and HTML DOM (to display or use the data)  AJAX applications might use XML, plain text or JSON text to transport data. AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page. How ajax works 1. An event occurs in a web page (the page is loaded, a button is clicked) 2. An XMLHttpRequest object is created by JavaScript 3. The XMLHttpRequest object sends

JavaScript arrays are used to store multiple values in a single variable. They are like sets in mathematics. It stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data. You can create an array as JS var myarray = new Array ( element1 , element2 , element3 ) ; //or var myarray2 = [ element1 , element2 , element3 ] ; The maximum length allowed for an array is 4,294,967,295. Spaces and line breaks are not important. A declaration can span multiple lines JS var socialMedia = [ " Facebook " , " Twitter " , " Instagram " , " Snapchat " , " Hike " ] ; Access the Elements of an Array You refer to an array element by referring to the index number.You can also use them to edit the value of element, add element or to assign the value to a variable. This will assign the value of 2nd element of array socialMedia to a new variable. JS