By Miran Lipovaca
Retail reproduction, bought via No Starch
It's all within the identify: Learn You a Haskell for nice Good! is a hilarious, illustrated advisor to this advanced useful language. filled with the author's unique art, popular culture references, and most significantly, important instance code, this ebook teaches practical basics in a manner you by no means inspiration possible.
You'll begin with the child stuff: uncomplicated syntax, recursion, kinds and kind periods. Then as soon as you've bought the fundamentals down, the genuine black belt master-class starts off: you'll discover ways to use applicative functors, monads, zippers, and the entire different legendary Haskell constructs you've purely examine in storybooks.
As you're employed your manner during the author's ingenious (and sometimes insane) examples, you'll examine to:
* giggle within the face of unwanted effects as you wield in simple terms sensible programming techniques
* Use the magic of Haskell's "laziness" to play with countless units of data
* arrange your courses via growing your personal kinds, kind sessions, and modules
* Use Haskell's stylish input/output procedure to proportion the genius of your courses with the skin world
Short of consuming the author's mind, you won't discover a larger strategy to examine this robust language than studying Learn You a Haskell for nice Good!
Read Online or Download Learn You a Haskell for Great Good!: A Beginner's Guide PDF
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Extra resources for Learn You a Haskell for Great Good!: A Beginner's Guide
We call that side the hypotenuse. 10] ] We’re drawing from three lists on the right-hand side of the comprehension, and the output expression on the left combines them into a list of triples. If you evaluate triples in GHCi, you’ll get a list that is 1,000 entries long, so we won’t show it here. Next, we’ll filter out triples that don’t represent right triangles by adding a predicate that checks to see if the Pythagorean theorem (a^2 + b^2 == c^2) Starting Out 21 holds. a], a^2 + b^2 == c^2] Notice how we changed the ranges in the lists that we draw values from.
Note that the empty tuple () is also a type, which can have only a single value: (). Type Variables It makes sense for some functions to be able to operate on various types. For instance, the head function takes a list and returns the head element of that list. It doesn’t really matter if the list contains numbers, characters, or even more lists! The function should be able to work with lists that contain just about anything. What do you think the type of the head function is? Let’s check with the :t function: ghci> :t head head :: [a] -> a What is this a?
The type declaration of head states that it takes a list of any type and returns one element of that type. NOTE Although type variables can have names that are longer than one character, we usually give them names like a, b, c, d, and so on. Remember fst? It returns the first item in a pair. Let’s examine its type: ghci> :t fst fst :: (a, b) -> a You can see that fst takes a tuple and returns an element that is of the same type as its first item. That’s why we can use fst on a pair that contains items of any two types.