By Miran Lipovaca
Retail reproduction, bought via No Starch
It's all within the identify: Learn You a Haskell for excellent Good! is a hilarious, illustrated advisor to this advanced practical language. jam-packed with the author's unique art, popular culture references, and most significantly, important instance code, this e-book teaches practical basics in a fashion you by no means notion possible.
You'll commence with the child stuff: uncomplicated syntax, recursion, forms and kind sessions. Then as soon as you've acquired the fundamentals down, the true black belt master-class starts off: you'll learn how to use applicative functors, monads, zippers, and all of the different legendary Haskell constructs you've in basic terms examine in storybooks.
As you're employed your means during the author's creative (and sometimes insane) examples, you'll research to:
* snort within the face of unwanted side effects as you wield merely practical programming techniques
* Use the magic of Haskell's "laziness" to play with limitless units of data
* manage your courses by means of developing your individual forms, sort sessions, and modules
* Use Haskell's dependent input/output process to percentage 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 strong language than studying Learn You a Haskell for excellent 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
Sample text
As another simple example, let’s implement our own max function to compare two items and return the larger one: max' :: (Ord a) => a -> a -> a max' a b | a <= b = b | otherwise = a We can also implement our own compare function using guards: myCompare :: (Ord a) => a -> a -> Ordering a `myCompare` b | a == b = EQ | a <= b = LT | otherwise = GT ghci> 3 `myCompare` 2 GT NOTE Not only can we call functions as infix with backticks, we can also define them using backticks. Sometimes this makes them easier to read.
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. This ensures that we don’t check unnecessary triples, such as ones where side b is larger than the hypotenuse (in a right triangle, the hypotenuse is always the longest side). We also assumed that side b is never larger than side a.
As another simple example, let’s implement our own max function to compare two items and return the larger one: max' :: (Ord a) => a -> a -> a max' a b | a <= b = b | otherwise = a We can also implement our own compare function using guards: myCompare :: (Ord a) => a -> a -> Ordering a `myCompare` b | a == b = EQ | a <= b = LT | otherwise = GT ghci> 3 `myCompare` 2 GT NOTE Not only can we call functions as infix with backticks, we can also define them using backticks. Sometimes this makes them easier to read.