Download Beginning Haskell: A Project-Based Approach by Alejandro Serrano Mena PDF

By Alejandro Serrano Mena

Starting Haskell presents a broad-based advent to the Haskell language, its libraries and surroundings, and to the practical programming paradigm that's quick turning out to be in significance within the software program undefined. The ebook takes a project-based method of studying the language that's unified round the development of a web based storefront. first-class insurance is given to the Haskell atmosphere and helping instruments. those contain the Cabal construct software for handling tasks and modules, the HUnit and QuickCheck instruments for software program checking out, the Scotty framework for constructing net purposes, continual and Esqueleto for database entry, and in addition parallel and disbursed programming libraries.

Functional programming is collecting momentum, permitting programmers to specific themselves in a extra concise method, decreasing boilerplate and lengthening the security of code. certainly, mainstream languages equivalent to C# and Java are adopting gains from sensible programming, and from languages enforcing that paradigm. Haskell is a chic and noise-free natural sensible language with a protracted historical past, having an immense variety of library participants and an energetic group. This makes Haskell the easiest device for either studying and using useful programming, and starting Haskell the correct booklet to teach off the language and what it may possibly do.

* Takes you thru a sequence of initiatives exhibiting different components of the language.
* presents an outline of crucial libraries and instruments within the Haskell ecosystem.
* Teaches you ways to use practical styles in real-world situations.

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Extra info for Beginning Haskell: A Project-Based Approach

Example text

You don’t need to include all the fields, just those for which you want to bind or match. You are even allowed to write an empty list of fields, as this example highlights: greet greet greet greet :: ClientR -> IndividualR { CompanyR { GovOrgR { String person = PersonR { firstName = fn } } = "Hi, " ++ fn clientRName = c } = "Hello, " ++ c } = "Welcome" There are two interesting additions in GHC to record matching that encode very usual patterns, allowing for a lesser amount of boilerplate code.

But field names can, so you are allowed to use clientRName for fields in different alternatives, given that they have the same type. Here are the new record definitions: data ClientR = GovOrgR { clientRName :: String } | CompanyR { clientRName :: String , companyId :: Integer , person :: PersonR , duty :: String } | IndividualR { person :: PersonR } deriving Show data PersonR = PersonR { firstName :: String , lastName :: String } deriving Show 41 CHAPTER 2 N DECLARING THE DATA MODEL You can create values from these types using the same constructor syntax that you’ve been using.

U You learned how to define new functions and how to use let and where to create temporary bindings that allow reusing expressions and thus writing better code. Afterward, you learned how to define a function by cases. u You defined your first data types, learned about ADTs and constructors, and played with creating new values in the interpreter. u Pattern matching is a fundamental tool for Haskell programming, which I touched upon in this chapter. You saw how to match both primitive and user-defined types and how guards, as patterns and view patterns, make matching more concise.

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