在Haskell中,Type-Level Programming是指在类型级别使用编程技术来进行计算和操作的过程。在Haskell中,类型本身就是一种编程语言中的一等公民,因此可以进行类型级别的计算和操作。通过Type-Level Programming,可以在编译时进行类型检查,确保程序在运行时不会出现类型错误。Type-Level Programming可以用来实现各种高级功能,如...
一些类型层面编程 (Type level programming) 上的 Hack 在一些对类型层面编程 (Type level programming) 有良好支持的编程语言,如 TypeScript 中,never也常常作为某种 Hack,如果某个类型经过某种计算满足某个条件就返回该类型本身,否则返回never,这起到了某种“校验”的效果(你不需要理解这里的实现,这里涉及了不少 T...
Haskelltype-level programmingtype familiesfunctional dependenciesinjectivityHaskell, as implemented by the Glasgow Haskell Compiler (GHC), allows expressive type-level programming. The most popular typelevel programming extension is TypeFamilies, which allows users to write functions on types. Yet, using ...
Scalaz, Shapeless, Cats, Haskell, the usual suspects ;) Maintainers A.k.a. people whom you can bug/tag/@ on Gitter :D lloydmeta Centril ExpHPAbout Funktional generic type-level programming in Rust: HList, Coproduct, Generic, LabelledGeneric, Validated, Monoid and friends. beachape.com/...
用TS 实现了一个简单的 type-level Parsec,就是 Haskell 那个 Parsec. 这里简单实现了一个基本的 JSON Parser. 这东西完全是编译期计算的,全都是类型体操,没有一点运行时代码。图二展示了这个 JSON Parser 自身的全部代码。 这个神秘东西是怎么实现的呢?众所周知 Haskell 的 Parsec 实际上就是提供了一堆组合子...
Rhine is a beginner-friendly Haskell project! Even if you're new to Haskell and FRP, you can contribute. This is a good place to start contributing to open-source projects. Have a look at issues labelledgood first issue. If you have questions, don't hesitate to ask on Github. ...
The popular Glasgow Haskell Compiler extends the Haskell 98 type system with several powerful features, leading to an expressive language of type terms. In contrast, constraints over types have received much less attention, creating an imbalance in the e
Presented at the Implementing Functional Languages workshop, Sept 2007 (IFL07), but not part of its post-refereed proceedings. Download BibTex We report on an extension of Haskell with type(-level) functions and equality constraints. We illustrate their usefulness in the context of phantom types...
Haskell and ML communities have expressed strong interest in meta-programming [49,59,58,34,35,53, etc.]. Layer- ing provides a simple solution to this problem. In 2-layered System F, we replace validity of types with well-kindedness of types: Ψ ; Γ ⊢i T : ∗. Following the ...
Chapter 4. Functions In the last chapter we covered the basics of TypeScript’s type system: primitive types, objects, arrays, tuples, and enums, as well as the basics of TypeScript’s type … - Selection from Programming TypeScript [Book]