By Michael Snoyman

This fast-moving advisor introduces internet program improvement with Haskell and Yesod, a effective language/framework blend that helps high-performing purposes which are modular, type-safe, and concise. absolutely up-to-date for Yesod 1.4, this moment version indicates you the way Yesod handles widgets, varieties, patience, and RESTful content material. writer Michael Snoyman additionally introduces a variety of Haskell instruments to complement your uncomplicated wisdom of the language.

By the time you end this e-book, you’ll create a production-quality internet software with Yesod’s ready-to-use scaffolding. You’ll additionally study numerous real-world examples, together with a weblog, a wiki, a JSON internet provider, and a Sphinx seek server.

Build an easy program to benefit Yesod’s starting place datatype and net program Interface (WAI)Output HTML, CSS, and Javascript with Shakespearean template languages
Get an indepth examine Yesod’s middle monads for generating purifier, extra modular code
Probe Yesod’s inner workings: study the request dealing with procedure for a standard application
Build varieties on best of widgets through enforcing the yesod-form declarative API
Learn how Yesod and Haskell deal with patience and consultation data
Serve an HTML web page and a machine-friendly JSON web page from an identical URL

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Extra resources for Developing Web Apps with Haskell and Yesod: Safety-Driven Web Development (2nd Edition)

Sample text

2 is exactly equivalent to the graph shown in Fig. 2. Fig. 2 A tabular notation of the graph in Fig. 6 kg” “5 stars” More specifically, each row in the table represents one arrow in the graph, including the start node, the edge with the arrow, and the end node. The first column, therefore, has the name of the start node, the second column has the label of the edge, and the third column has the name of the end node. 2 will always be able to represent it correctly. • It should provide a mechanism to connect the distributed information (knowledge) over the Web.

Yes, there are probably more requirements you would like to add to this standard, but you have got the point. And, as you have guessed, W3C has long realized the need for such a standard, and the standard has been published and called RDF. So, in plain English, we can define RDF as follows: RDF is a standard published by W3C, and it can be used to represent distributed information/knowledge in a way that computer applications can use and process in a scalable manner. At this point, the above definition about RDF is good enough for us to continue.

If reuse is desirable, then for a given resource, how do we know if there exists some URI already? How do we find it? What if there are multiple URIs existing for this single resource? At this point, we are not going into the details of the answers to these questions, since they are all covered in later chapters. For now, one thing important to remember is to always reuse URIs and only invent your own if you absolutely have to. 3, we have simply chosen to invent our own URIs, because the main goal here is to show you the concept of RDF abstract model.

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