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This fast-moving tutorial introduces you to OCaml, an industrial-strength programming language designed for expressiveness, safety, and speed. Through the book's many examples, you'll quickly learn how OCaml stands out as a tool for writing fast, succinct, and readable systems code using functional programming. Real World OCaml takes you through the concepts of the language at a brisk pace, and then helps you explore the tools and techniques that make OCaml an effective and practical tool. You'll also delve deep into the details of the compiler toolchain and OCaml's simple and efficient runtime system. This second edition brings the book up to date with almost a decade of improvements in the OCaml language and ecosystem, with new chapters covering testing, GADTs, and platform tooling. This title is also available as open access on Cambridge Core, thanks to the support of Tarides. Their generous contribution will bring more people to OCaml.
We wrote this book because we believe in the importance of programming languages, and that OCaml in particular is an important language to learn. Both of us have been using OCaml in our academic and professional lives for over 20 years, and in that time we've come to see it as a powerful tool for building complex software systems. This book aims to make this tool available to a wider audience, by providing a clear guide to what you need to know to use OCaml effectively in the real world.
Real World OCaml is aimed at programmers who have some experience with conventional programming languages, but not specifically with statically typed functional programming. Depending on your background, many of the concepts we cover will be new, including traditional functional-programming techniques like higher-order functions and immutable data types, as well as aspects of OCaml's powerful type and module systems.
If you already know OCaml, this book may surprise you. Base redefines most of the standard namespace to make better use of the OCaml module system and expose a number of powerful, reusable data structures by default. Older OCaml code will still interoperate with Base, but you may need to adapt it for maximal benefit. All the new code that we write uses Base, and we believe the Base model is worth learning it's been successfully used on large, multimillion-line codebases and removes a big barrier to building sophisticated applications in OCaml