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his introductory chapter will address some of the major questions you may have about F# and functional programming.

I am convinced that the developers of the LEGO RCX could neither have imagined the extraordinary success of their product, nor were they able to predict that the Programmable Brick would constitute a worldwide community of adult fans collaborating with and to some extent, competing with one another in miscellaneous domains, such as the creation of highly sophisticated LEGO robots or the design of astute sensors and actuators.

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he Internet as we know it today has undergone tremendous change. Beginning with simple textual browsers that allowed scientists to exchange research, the Internet is now a hub for commerce and information. Over that time, we ve seen a number of new technologies and approaches from the earliest graphical browsers to podcasts. Today, the Internet has become the leading platform for numerous applications (when was the last time you actually spoke with a travel agent ), but despite the convenience, few would mistake a Web application with its desktop cousin. This chapter will give a brief overview of the evolution of Web applications. Once we have you grounded in the past, we ll introduce you to what we view as the future: Ajax.

Functional programming (FP) is the oldest of the three major programming paradigms The first FP language, IPL, was invented in 1955, about a year before Fortran The second, Lisp, was invented in 1958, a year before Cobol Both Fortran and Cobol are imperative (or procedural) languages, and their immediate success in scientific and business computing made imperative programming the dominant paradigm for more than 30 years The rise of the object-oriented (OO) paradigm in the 1970s and the gradual maturing of OO languages ever since have made OO programming the most popular paradigm today Despite the vigorous and continuous development of powerful FP languages (SML, OCaml, Haskell, and Clean, among others) and FP-like languages (APL and Lisp being the most successful for real-world applications) since the 1950s, FP remained a primarily academic pursuit until recently The early commercial success of imperative languages made it the dominant paradigm for decades.

For almost a decade, this community has established itself and constantly grown But during the last months it has gained strong impetus with the appearance of the LEGO NXT Many members of the community are known to be excellent MINDSTORMERS, but only a handful of people have acquired the overall accepted although unofficial status of a master MINDSTORMER The authors of this book are approved masters! Michael Gasperi is one of the pioneers of extending the RCX functionality Known as Mr Sensor, he initiated the development of compatible sensors He also started a well-visited web site, sharing details of his projects with RIS fans and setting up a collection of chosen links to other people s sensor pages that he was able to grab on the Internet.

In the beginning, it was all so simple Initially connecting a handful of top research institutions in the United States, the original Internet was designed to facilitate the sharing of scientific research Whether you were a librarian, nuclear physicist, or computer scientist, you had quite a complex system to learn Firefox and Internet Explorer weren t even concepts when JCR Licklider of the Massachusetts Institute of Technology (MIT) first presented his ideas on a Galactic Network in 1962 Licklider went on to head up computer research at the Defense Advanced Research Projects Agency (DARPA), where he preached the importance of his networking ideas About the same time, Leonard Kleinrock and Lawrence G Roberts of MIT were working on packetswitching theory, a key concept to networking computers.