Download E-books Developing Web Applications with Haskell and Yesod PDF

By Michael Snoyman

This fast-moving advisor introduces net program improvement with Haskell and Yesod, a powerful language/framework mixture that helps high-performing functions which are modular, type-safe, and concise. You’ll paintings with numerous samples to discover the best way Yesod handles widgets, kinds, patience, and RESTful content material. you furthermore may get an creation to numerous Haskell instruments to complement your simple wisdom of the language.

By the time you end this e-book, you’ll create a production-quality internet program 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.
* construct an easy program to benefit Yesod’s starting place datatype and internet software Interface (WAI)
* Use Shakespearean template languages for HTML, CSS, and Javascript output
* Produce cleanser, extra modular code via studying how Yesod monads engage
* enforce the yesod-form declarative API to construct kinds on most sensible of widgets
* learn the way Yesod and Haskell shop consultation facts and deal with patience
* Use strategies to serve an HTML web page and a machine-friendly JSON web page from an analogous URL
* Create reusable parts for a number of purposes with Yesod subsites

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Hamlet Syntax Hamlet is the main subtle of the languages. not just does it offer syntax for producing HTML, it additionally enables easy keep an eye on constructions: conditionals, looping, and maybes. Tags evidently tags will play a huge a part of any HTML template language. In Hamlet, we attempt to stay very with regards to current HTML syntax to make the language more well-off. although, rather than utilizing final tags to indicate nesting, we use indentation. So anything like this in HTML:

Some paragraph.

  • Item 1
  • Item 2

will be

Some paragraph.

  • Item 1
  • Item 2 commonly, we discover this to be more uncomplicated to keep on with than HTML when you get acquainted with it. the one difficult half comes with facing whitespace earlier than and after tags. for instance, let’s say you must create the HTML

    Paragraph italic finish.

    we wish to ensure that there's a whitespace preserved after the be aware “Paragraph” and earlier than the observe “end”. to take action, we use basic break out characters:

    Paragraph # italic \ finish. The whitespace get away principles are literally extremely simple: If the 1st non-space personality in a line is a backslash, the backslash is missed. If the final personality in a line is a hash, it truly is neglected. another factor. Hamlet doesn't break out entities inside of its content material. this can be performed on goal to permit latest HTML to be extra simply copied in. So the instance above may be written as:

    Paragraph italic finish. discover that the 1st tag can be immediately closed by way of Hamlet, whereas the internal “i” tag won't. you're loose to exploit whichever method you will have, there's no penalty for both selection. bear in mind, even though, that the one time you utilize last tags in Hamlet is for such inline tags; general tags aren't closed. Interpolation What now we have thus far is a pleasant, simplified HTML, however it doesn’t allow us to engage with our Haskell code in any respect. How can we cross in variables? easy: with interpolation: #{title} The hash by way of a couple of braces denotes variable interpolation. within the case above, the identify variable from the scope during which the template was once known as can be used. allow me nation that back: Hamlet instantly has entry to the variables in scope while it’s known as. there's no have to in particular cross variables in. you could observe capabilities inside an interpolation. you should use string and numeric literals in an interpolation. you should use certified modules. either parentheses and the buck signal can be utilized to staff statements jointly. And on the finish, the toHtml functionality is utilized to the outcome, that means any example of ToHtml might be interpolated. Take, for example, the next code. -- simply forget about the quasiquote stuff for now, and that shamlet factor. -- will probably be defined later. {-# LANGUAGE QuasiQuotes #-} import textual content. Hamlet (shamlet) import textual content. Blaze. Renderer. String (renderHtml) import information. Char (toLower) import info. record (sort) information individual = individual { identify :: String , age :: Int } major :: IO () major = putStrLn $ renderHtml [shamlet| <p>Hello, my identify is #{name individual} and i'm #{show $ age person}.</p> </div> <div class="breadcrumbs" typeof="BreadcrumbList" vocab=""><span property="itemListElement" typeof="ListItem"><a property="item" typeof="WebPage" title="Go to EDFRED Corporation E-books." href="" class="home"><span property="name">EDFRED Corporation E-books</span></a><meta property="position" content="1"></span> > <span property="itemListElement" typeof="ListItem"><a property="item" typeof="WebPage" title="Go to the Nonfiction category archives." href="" class="taxonomy category"><span property="name">Nonfiction</span></a><meta property="position" content="2"></span> > <span property="itemListElement" typeof="ListItem"><span property="name">Download E-books Developing Web Applications with Haskell and Yesod PDF</span><meta property="position" content="3"></span></div> <div itemscope itemtype=""> <span itemprop="aggregateRating" itemscope itemtype=""> Rated <meta itemprop="worstRating" content="1"> <span itemprop="ratingValue" class="rating-value">4.24</span> of <span itemprop="bestRating">5</span> – based on <span itemprop="ratingCount" class="rating-count">31</span> votes </span> </div> <!-- <rdf:RDF xmlns:rdf="" xmlns:dc="" xmlns:trackback=""> <rdf:Description rdf:about="" dc:identifier="" dc:title="Download E-books Developing Web Applications with Haskell and Yesod PDF" trackback:ping="" /> </rdf:RDF> --> <div class="page-links"></div> </div> <div class="postinfo clearfix"></div> </article> </section> <section id="sidebar" class="secondary clearfix" role="complementary"> <aside id="archives-1" class="widget widget_archive clearfix"><h3 class="widgettitle"><span>Archives</span></h3> <ul> <li><a href=''>May 2017</a></li> <li><a href=''>April 2017</a></li> <li><a href=''>March 2017</a></li> <li><a href=''>February 2017</a></li> <li><a href=''>January 2017</a></li> <li><a href=''>December 2016</a></li> <li><a href=''>November 2016</a></li> <li><a href=''>October 2016</a></li> </ul> </aside><aside id="books-1" class="widget widget_books clearfix"><h3 class="widgettitle"><span>Featured books</span></h3><ul id="books-widget"><li><a title="Black Diamond: A Mystery of the French Countryside by Martin Walker" href=""><img src=",204,203,200_.jpg"></a><a title="When Parents Text: So Much Said...So Little Understood by Sophia Fraioli, Lauren Kaelin" href=""><img src=",204,203,200_.jpg"></a></li><li><a title="Life with My Sister Madonna by Christopher Ciccone, Wendy Leigh" href=""><img src=",204,203,200_.jpg"></a><a title="The Transgender Guidebook: Keys to a Successful Transition" href=""><img src=",204,203,200_.jpg"></a></li><li><a title="With Silent Screams (The Hellequin Chronicles) by Steve McHugh" href=""><img src=",204,203,200_.jpg"></a><a title="Unthinkable Thoughts: Academic Freedom and Models of Statehood for Israel and Palestine by Susan G. 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