Mark Wilson I am the creator of TopXML. I am available for international and local (Australia) contracts. I am a Solution Architect/Business Analyst. I have worked in IT in several countries (NZ, Australia, South Africa, UK) building and training teams for government and very large non-governmental organizations. I am ex-Microsoft Consulting Services. I wrote the first book on Microsoft XML published in 2000 called XML Programming with VB and ASP. Most recently I have been building tools for the SEO industry. Ask me for a 37 point SEO health-checkup for your website.
First posted :
03/24/2008
Times viewed :
244
JavaScript Nothingness
Introduction
JavaScript has more kinds of nothing than any other
language. They are basically used to define a variable with nothing in it.
Usually each declared variable should be defined with some value, when it is
initialized. However it is not really necessary. The following nothingness
options are available: null, undefined, undeclared, uninitialized, unknown,
unsafe and void. You can use typeof to check if the variable is a member of the
global window object, which all global are.
