About the author T.J. Crowder is a software engineer with 30 years of experience, including over 15 years of professional work in JavaScript. He runs Farsight Software, a software contracting and product company. He's often found helping people on Stack Overflow, where he's a top 10 all-time contributor and the top JavaScript contributor. When not working or writing, he…no, sorry, he's always working or writing – or spending time with his wonderful, supportive wife and fantastic son. Visit us at www.wiley.com for free code samples.