This is the first book to bring F# to the world. It is likely to have many imitators but few competitors. Written by F# evangelist, Rob Pickering, and tech reviewed by F#'s inventor, Don Syme, it is an elegant, comprehensive introduction to all aspects of the language and an incisive guide to using F# for real-world professional development. It is detailed, yet clear and concise, and suitable for readers at any level of experience. Every professional .NET programmer needs to learn about Functional Programming (FP), and there's no better way to do it than by learning F# - and no easier way to learn F# than from this book.