Haskell programmers often wonder whether to use let or where. This seems to be only a matter of taste in the sense of "Declaration vs. expression style", however there is more to it. It is important to know that let ... in ... is an expression, that is, it can be written wherever expressions are allowed. In contrast, where is bound to a surrounding syntactic construct, like the pattern matching li
The Monad.Reader is an electronic magazine about all things Haskell. It is less formal than journal, but more enduring than a wiki-page or blog post. There have been a wide variety of articles, including: exciting code fragments, intriguing puzzles, book reviews, tutorials, and even half-baked research ideas. Please note that the Monad.Reader has moved to http://themonadreader.wordpress.com. This
Hughes's original formulation of arrows used a point-free style, which is convenient for calculating general properties, but cumbersome for specific definitions. [Pat01] proposes to extend Haskell so that arrows are almost as convenient to describe as monadic computations. The new forms are defined by translation back to standard Haskell. Here's a simple example to illustrate the notation: addA ::
There are many Emacs packages and modules for Haskell. haskell-mode is stable and usable, whereas lsp-haskell is newer but under development and not ready for general use. Newbie guide Emacs is an extensible texteditor which can be extended with so-called "modes" and makes great use of keystrokes. Modes are written in Emacs Lisp (.el) programming language and provide additional commands and keystr
One of Haskell's main features is non-strict semantics, which is implemented by lazy evaluation in all popular Haskell compilers. However many Haskell libraries found on Hackage are implemented as if Haskell were a strict language. This leads to unnecessary inefficiencies, memory leaks and, we suspect, unintended semantics. In this article we want to go through some techniques on how to check lazy
Warning: This page is outdated. If you can help update it, please do! A developers' guide to creating a new Haskell project or program, and working in the Haskell developer ecosystem. Note: for learning the Haskell language itself we recommend these resources. Recommended tools Almost all new Haskell projects use the following tools. Each is intrinsically useful, but using a set of common tools al
Simon Marlow marlowsd at gmail.com Tue Aug 5 05:23:15 EDT 2008 Previous message: Daily report for stable Next message: Version control systems Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Following lots of useful discussion and evaluation of the available DVCSs out there, the GHC team have made a decision: we're going to switch to git. It came down to two things: the degree of
Introduction This Wiki article describes an experiment targeting execution of Haskell programs on top of the Erlang Virtual Machine (BEAM). Haskell source code is compiled to Yhc Core with York Haskell Compiler (Yhc), next the program further discussed converts Yhc Core to Core Erlang; finally Erlang Compiler (erlc) compiles Core Erlang to the BEAM file format which can be loaded and executed by t
[Haskell] ANNOUNCE: Galois web libraries for Haskell released Don Stewart dons at galois.com Mon Apr 21 14:11:19 EDT 2008 Previous message: [Haskell] Re: DRAFT: Haskell' status update Next message: [Haskell] Re: [Haskell-cafe] ANNOUNCE: Galois web libraries for Haskell released Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Galois, Inc. is pleased to announce the open source releas
Introduction This page is intended as a brief overview of delimited continuations and related constructs, and how they can be used in Haskell. It uses the library CC-delcont as a vehicle for doing so, but the examples should be general enough so that if you have another implementation, they should be relatively straight forward to port (whenever possible, I have endeavored not to use the operators
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