JavaScript: the most underestimated, undervalued and misunderstood language

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

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

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.

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

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

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

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

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));

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); }

Misunderstood
JavaScript is NOT Java
Its a functional language

Problems With JavaScript
Design Errors
Bad Implementations
Browser wars

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

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

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

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JavaScript: the most underestimated, undervalued and misunderstood language

by Binny V A on Feb 03, 2008

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