@dfeuer 这并不是为了展示一个更简单的例子,而是为OP提出一个合适的练习,并暴露出解决方案的合理论证,试图证明不必成为超级 Haskell 大师也能得到这样的解决方案。关于效率的离题讨论不予考虑。 - lsmor 3 你不需要具备数学方面的专业知识才能编写像 foldM 这样的函数。我已经在生产环境中使用 Haskell 4 年了,...
不使用higher-order functions并且不约束求值策略和顺序的。 不使用higher-order functions并且精确约束约束求值策略和顺序的。 使用higher-order functions并且精确约束约束求值策略和顺序的。 说起来似乎很复杂,但是消除higher-order functions和约束求值策略在当今这个时代其实已经被广发地应用于现代编译器之中了,他们就是两...
For the rapid development of internetware, functional programming languages, such as Haskell and Scala, can be used to implement complex domain-specific applications. In functional programming languages, a higher-order function is a function that takes functions as parameters or returns a function. ...
We introduced user-defined functions as a mechanism for abstracting patterns of numerical operations so as to make them independent of the particular numbers involved. With higher-order functions, we begin to see a more powerful kind of abstraction: some functions express general methods of computatio...
Bend offers the feel and features of expressive languages like Python and Haskell. This includes fast object allocations, full support for higher-order functions with closures, unrestricted recursion, and even continuations. Bend scales like CUDA, it runs on massively parallel hardware like GPUs, ...
匿名函数,顾名思义,就是函数没有名称。Haskell语言里的lambdas以\开头,后面跟参数,再接以->开头的函数体。 比较匿名函数和普通的函数,我们发现它们的结构类似,只是匿名函数中不需要进行函数声明和函数名称,以->符号替代了普通函数中的=。匿名函数同样支持样式匹配(pattern matching),区别是我们针对一个参数只能使用一...
range-free LINQ-like library of higher-order functions for manipulation of containers and lazy input-sequences. Documentation What it's for Reduce the amount of mutable state. Flatten control-flow. Lessen the need to deal with iterators directly. ...
sid=08/12/10/0135231&from=rss Mark Jason Dominus的Perl语言编程著作《Higher-Order Perl》现在提供阅览和dl。这本书的目的是向有C和Unix背景的Perl程序员讲授函数... 评分☆☆☆ 《Higher-Order Perl》提供阅览 (2008-12-10 10:43) http://developers.solidot.org/article.pl?sid=08/12/10/0135231...
and how streamlined it makes it to write programs with linear types – we implemented our type system in GHC, the leading Haskell compiler, and demonstrate two kinds of applications of linear types: mutable data with pure interfaces; and enforcing protocols in I/O-performing ...
The technique is based on using partial function graphs to represent higher-order objects. The main problem in finding fixpoints for higher-order functions is to es-tablish a notion of neededness so as to restrict the iteration to those parts of the function that may influence the result. ...