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Download Learn You a Haskell for Great Good!: A Beginner's Guide by Miran Lipovaca PDF

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 consultant to this complicated practical language. full of the author's unique paintings, popular culture references, and most significantly, precious instance code, this publication teaches useful basics in a fashion you by no means inspiration possible.

You'll begin with the child stuff: uncomplicated syntax, recursion, varieties and kind sessions. Then as soon as you've acquired the fundamentals down, the genuine black belt master-class starts: 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 manner in the course of the author's resourceful (and sometimes insane) examples, you'll examine to:
* chuckle within the face of negative effects as you wield in basic terms useful programming techniques
* Use the magic of Haskell's "laziness" to play with limitless units of data
* set up your courses by means of developing your personal varieties, variety periods, and modules
* Use Haskell's dependent input/output process to proportion the genius of your courses with the surface world

Short of consuming the author's mind, you won't discover a greater strategy to research this robust language than analyzing Learn You a Haskell for nice Good!

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Extra resources for Learn You a Haskell for Great Good!: A Beginner's Guide

Example text

However, patterns that include the : character will match only against lists of length one or more. " head' (x:_) = x 38 Chapter 3 After loading the function, we can test it, like this: ghci> head' [4,5,6] 4 ghci> head' "Hello" 'H' Notice that if we want to bind something to several variables (even if one of them is just _), we must surround them in parentheses so Haskell can properly parse them. Also notice the use of the error function. This function takes a string as an argument and generates a runtime error using that string.

This function will berate you in different ways depending on your body mass index (BMI). Your BMI is calculated by dividing your weight (in kilograms) by your height (in meters) squared. 5, you’re considered underweight. 5 to 25, you’re considered normal. A BMI of 25 to 30 is overweight, and more than 30 is obese. 0 = "You're supposedly normal. 0 = "You're fat! " A guard is indicated by a pipe character (|), followed by a Boolean expression, followed by the function body that will be used if that expression evaluates to True.

Apple", "orange", "cherry", "mango"] [(1,"apple"),(2,"orange"),(3,"cherry"),(4,"mango")] Finding the Right Triangle Let’s wrap things up with a problem that combines tuples and list comprehensions. We’ll use Haskell to find a right triangle that fits all of these conditions: • The lengths of the three sides are all integers. • The length of each side is less than or equal to 10. • The triangle’s perimeter (the sum of the side lengths) is equal to 24. A triangle is a right triangle if one of its angles is a right angle (a 90-degree angle).

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