Expert JavaScript Developer

► The unescape() function is used to decode the encoded string.

► Syntax : unescape(string1)

► Where string1 is the string to be decoded.

► Example :

<script>

document.write(unescape("Questions%3F%20Get%20from%20us%21"));

</script>

- Output :

Questions? Get from us!

Namespacing is used for grouping the desired functions, variables etc. under a unique name. It is a name that has been attached to the desired functions, objects and properties. This improves modularity in the coding and enables code reuse.

► The difference is that onDocumentReady is called after the DOM is loaded without waiting for all the contents to get loaded. While window.onload() function waits until the contents of page is loaded.

► Suppose there is very large image on a page, at that time onDocumentReady will wait until that image is loaded totally.

► So while using the window.onlaod() function the execution will be slow, but the onDocumentReady will not wait until the image is loaded.

There are no assertive measures which can be taken to foolproof your scripts and images, but preventive measures can be taken like copyrighting your pages, putting watermark on your images and applying non-technological way to protect your images. Scripts are difficult to protect as they can be accessed through many applications and many programs by using the web browsers.

Unobtrusive JavaScript is basically a JavaScript methodology that seeks to overcome browser inconsistencies by separating page functionality from structure. The basic premise of unobtrusive JavaScript is that page functionality should be maintained even when JavaScript is unavailable on a user's browser.

This can be done by Using JavaScript extensions (runs from JavaScript Editor), example for opening of a file -

fh = fopen(getScriptPath(), 0);

If you don't explicitly declare a variable, you risk creating an implied global variable. This is a problem, as you will be unable to create multiple instances of that object, as each new instance will overwrite the data from the last.

In general, global variables should be used only in very specific situations and are typically not recommended, as they can lead to a lot of odd side effects that may be difficult to track down.

In short, yes, but you must take into account the fact that null is considered an object in JavaScript. Even if x is null, 'console.log(typeof x === "object")' will log true instead of false.

To account for this, you must also test whether or not x is null by including the following:

console.log((x !== null) && (typeof x === "object"));