![]() Curry document his scholarly work and include lecture notes, articles, reports, journals, exams. To unpack the package including the revisions, use 'cabal get'. Sometimes half the work of the function can be done looking only at the first argument (but there really is only one argument, remember?): see functional dispatch. The papers of the mathematical logician Haskell P. curry-0.0.0.0.tar.gz browse (Cabal source package) Package description ( revised from the package) Note: This package has metadata revisions in the cabal description newer than included in the tarball.Sometimes it's valuable to think about functions abstractly without specifically giving all their arguments: this is the Pointfree style.Having said that, there are Haskell idioms and techniques for which you need to understand currying. The major advantage of considering all functions as curried is theoretical: formal proofs are easier when all functions are treated uniformly (one argument in, one result out). Much of the time, currying can be ignored by the new programmer. Haskell Brooks Curry, (born September 12, 1900, Millis, Massachusetts, U.S.died September 1, 1982, State College, Pennsylvania), American mathematician and educator whose research in logic led to his theory of formal systems and processes as well as to the formulation of a logical calculus using inferential rules. Alternatively, using tuples, you can write ( Int, Int ) -> Int, but keep in mind that the tuple constructor (,) itself can be curried.) (One can write the type as Int x Int -> Int if you really mean the former - but since all functions in Haskell are curried, that's not legal Haskell. You'll notice that the notation for types reflects this: you can read Int -> Int -> Int incorrectly as "takes two Ints and returns an Int", but what it's really saying is "takes an Int and returns something of the type Int -> Int" - that is, it returns a function that takes an Int and returns an Int. However, this doesnt quite behave in the way we might think. Find many great new & used options and get the best deals for Dover Books on Mathematics Ser.: Foundations of Mathematical Logic by Haskell B. If we call this function with 6 and 2 we unsurprisingly get 3: Prelude> div 6 2 3. Lets take the function div: div :: Int -> Int -> Int. According to our current on-line database, Haskell Curry has 7. In Haskell, all functions are considered curried: that is, all functions in Haskell take just one argument. Of course an optimizing compiler will probably handle that whole expression at once, but conceptually that's what's going on. Students: Click here to see the students ordered by family name. Then that resulting function can be applied to the value 2, so ( div 11 ) 2 yields 5. Just use the lambda and give the variables descriptive names. Using some special syntax for further arguments feels much too implicit for me. On its own, div 11 is a function of type Int -> Int. Haskell functions are written in a style that the common ones to curry are in the front for exactly that reason. The expression div 11 2 unsurprisingly evaluates to 5.īut there's more going on here than immediately meets the untrained eye. The logician who re-invented and developed combinatory logic. Div :: Int -> Int -> Int - which is actually Int -> (Int -> Int) Looking for Haskell Curry Find out information about Haskell Curry.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |