By Graham Hutton
Haskell is a merely practical language that permits programmers to swiftly strengthen transparent, concise, and proper software program. The language has grown in attractiveness lately, either in instructing and in undefined. This ebook relies at the author's event of educating Haskell for greater than 20 years. All ideas are defined from first ideas and no programming event is needed, making this ebook available to a wide spectrum of readers. whereas half I specializes in uncomplicated options, half II introduces the reader to extra complex subject matters. This re-creation has been broadly up-to-date and multiplied to incorporate contemporary and extra complicated gains of Haskell, new examples and routines, chosen strategies, and freely downloadable lecture slides and instance code. The presentation is fresh and straightforward, whereas additionally being absolutely compliant with the most recent model of the language, together with contemporary alterations bearing on applicative, monadic, foldable, and traversable forms.
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Extra info for Programming in Haskell
A well-known encoding method is the Caesar cipher , named after its use by Julius Caesar. To encode a string, Caesar simply replaced each letter in the string by the letter three places further down in the alphabet, wrapping around at the end of the alphabet. For example, the string "haskell is fun" CHAPTER 5. LIST COMPREHENSIONS 56 would be encoded as "kdvnhoo lv ixq" More generally, the shift factor of three used by Caesar can be replaced by any integer between one and twenty-ﬁve, thereby giving twenty-ﬁve diﬀerent ways of encoding a string.
10 Chapter remarks The term Bool for the type of logical values celebrates the pioneering work of George Boole on symbolic logic, while the term curried for functions that take their arguments one at a time celebrates the work of Haskell Curry (after whom the language Haskell itself is named) on such functions. A more detailed account of the type system is given in Haskell Report , while formal descriptions for specialists can be found in [21, 6]. 11 Exercises 1. What are the types of the following values?
Secondly, lambda expressions are also useful when deﬁning functions that return functions as results by their very nature, rather than as a consequence of currying. 6. SECTIONS 47 However, it is more appealing to deﬁne const in a way that makes explicit that it returns a function as its result, by including parentheses in the type and using a lambda expression in the deﬁnition itself: const const x :: a → (b → a) = λ →x Finally, lambda expressions can be used to avoid having to name a function that is only referenced once.