Michael Snoyman - Developing Web Applications with Haskell and Yesod
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- Book:Developing Web Applications with Haskell and Yesod
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This fast-moving guide introduces web application development with Haskell and Yesod, a potent language/framework combination that supports high-performing applications that are modular, type-safe, and concise. Youll work with several samples to explore the way Yesod handles widgets, forms, persistence, and RESTful content. You also get an introduction to various Haskell tools to supplement your basic knowledge of the language.
By the time you finish this book, youll create a production-quality web application with Yesods ready-to-use scaffolding. Youll also examine several real-world examples, including a blog, a wiki, a JSON web service, and a Sphinx search server.
- Build a simple application to learn Yesods foundation datatype and Web Application Interface (WAI)
- Use Shakespearean template languages for HTML, CSS, and Javascript output
- Produce cleaner, more modular code by learning how Yesod monads interact
- Implement the yesod-form declarative API to build forms on top of widgets
- Learn how Yesod and Haskell store session data and handle persistence
- Use techniques to serve an HTML page and a machine-friendly JSON page from the same URL
- Create reusable components for several applications with Yesod subsites
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Copyright 2012 Michael Snoyman
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Its fair to say that dynamic languages currently dominate the web development scene. Ruby, Python, and PHP are common choices for quickly creating a powerful web application. They give a much faster and more comfortable development setting than standard static languages in the C family, like Java.
But some of us are looking for something more in our development toolbox. We want a language that gives us guarantees that our code is doing what it should. Instead of writing up a unit test to cover every bit of functionality in our application, wouldnt it be wonderful if the compiler could automatically ensure that our code is correct? And as an added bonus, wouldnt it be nice if our code ran quickly too?
These are the goals of Yesod. Yesod is a web framework bringing the strengths of the Haskell programming language to the web development world. Yesod not only uses a pure language to interact with an impure world, it allows safe interactions with the outside world by automatically sanitizing incoming and outgoing data. Not only do we avoid basic mistakes such as mixing up integers and strings, it even allows us to statically prevent many cases of security holes like cross-site scripting (XSS) attacks.
In general, there are two groups of people coming to Yesod. The first group is long time Haskell usersalready convinced of the advantages of Haskellwho are looking for a powerful framework for creating web applications. The second is web developers who are either dissatisfied with their existing tools, or are looking to expand their horizons into the functional world.
This book assumes a basic familiarity with both web development and Haskell. We dont use many complicated Haskell concepts, and those we do use are introduced separately. For the most part, understanding the basics of the syntax of the language should be sufficient.
If you want to come up to speed on Haskell, I recommend another wonderful OReilly book: Real World Haskell .
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This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
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Yesod has been created by an entire community of developers, all of whom have put in significant effort to make sure that the final product is as polished and user-friendly as possible. Everyone from the core development team to the person making an API request on the mailing list has had an impact on bringing Yesod to where it is today.
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