JavaScript is an underestimated and misunderstood language that is more powerful than commonly believed. It is a versatile language for client-side scripting that allows dynamic interactions and brings web applications closer to traditional desktop applications. Issues like cross-browser compatibility and inconsistent implementations have led to misunderstandings, but libraries help address these problems and allow developers to write less code.

1. JavaScript: the most Underestimated, Undervalued and Misunderstood Language By Binny V A http://www.openjs.com/

2. You KNOW JavaScript! var sample_array = [42, 1337, &quot;Hello World&quot;]; for(var i=0; i<sample_array.length; i++) { alert(i + &quot;) &quot; + sample_array[i]); } function sayHi(name) { alert(&quot;Hi, &quot;+ name); } sayHi(&quot;Binny&quot;);

3. DOM – Document Object Model The Document Object Model (DOM) is a platform- and language-independent standard object model for representing HTML or XML and related formats.

4. DOM document.getElementById(“id-of-element”) OR $()‏ document.getElementsByTagName(“a”)‏ document.getElementsByName(“name”)‏ Useful Functions getElementsByClassName(“external-links”)‏ getElementsBySelector(“p.intro a”)‏

5. Undervalued JavaScript is NOT a toy Ajax! High Profile Applications - like Gmail Has more use than validation

6. Underestimated Leader in client side scripting Bring Web Apps closer to the Desktop

7. JavaScript is a Powerful language First Class functions Map, Reduce functions $(&quot;element&quot;).addEventListener(&quot;click&quot;, function(){ alert(this.innerHTML + &quot; was clicked&quot;; });

8. First Class functions Function that returns a function function addXTo(x) { return function(number) { return number+x; } } addFiveTo = addXTo(5); addNineTo = addXTo(9); alert(addFiveTo(3));

9. Polymorphic Functions The functionality of functions can be changed... function addEvent(obj,evt,fn) { if (document.addEventListener) { addEvent = function (obj,evt,fn) { obj.addEventListener(evt,fn,false); } } else if (document.attachEvent) { addEvent = function (obj,evt,fn) { obj.attachEvent('on'+evt,fn); } } addEvent(obj,evt,fn); }

10. Misunderstood JavaScript is NOT Java Its a functional language

11. Problems With JavaScript Design Errors Bad Implementations Browser wars

12. Solution to the Problem - Libraries Cross Browser Functionality You write less code Some operations are faster Better documentation than homebrew solutions etc.

13. JavaScript Libraries jQuery Prototype YUI Dojo ExtJS And many more...

14. JSL - JavaScript Library My Own JS Library http://www.openjs.com/scripts/jslibrary/