text VS ghcup-hs

String is a linked list of UTF-32 codepoints, which is just as bad as it sounds. Haskell programmers usually use Text from the text package instead.

This is the first release that was executed via the new GitHub CI. Everything went smoothly, except for an unexpected packaging bug on windows due to text-2.0 linking against libstdc++ by default.

In addition to what's mentioned, the "default" libraries people use are often not the best-performing ones. E.g. Data.Vector.Hashtables is often much faster than Data.HashMap.Strict (which again is typically faster than Data.Map). And we find performance papercuts in common libraries that may simply be due to not enough people optimising for speed.

Used by nearly every Haskell project: https://hackage.haskell.org/package/text 60% of the modules are ".Internal".

text

Here is a representative patch for text: https://github.com/haskell/text/pull/365/commits/37a2157245457a287d638bbceb472fe93b71f224 Hopefully it clarifies why achieving C performance is problematic even if you have enough primitive operations.

u/snoyberg laments here that a consequence of Text using unpinned memory is that the FFI can't operate directly on it. However, there do appear to be some places where foreign imported functions are called on the underlying unpinned ByteArray# (see how Text.copy calls this).

The compiler now shows more helpful error messages and GHCup allows us to manage multiple versions of GHC, Stack, and HLS (Haskell Language Server) in a breeze. Compilation time is faster now, but I believe it is because hardware has become faster over the years. Unfortunately, cross-compiling is not yet as simple.

Install Haskell using GHCup. In days of old installing Haskell used to be a pain, but nowadays Haskell comes with a self-isolated thing call ghcup - you install it once, and then it installs the rest of the universe in its own isolated directory that can be independently deleted or updated without affecting the rest of your system.

Try this https://www.haskell.org/ghcup/ but with Window's WSL2.

I have been using helix with ghcup installed ghc(s) and language servers. It works with Haskell out of box, no configuration necessary. Helix is a modal editor, similar to but distinctly different from the vi family. Although a long time vim user I have found the switch to helix not too difficult and definitely worth the trouble.

makefile_dir := $(dir $(abspath $(lastword $(MAKEFILE_LIST)))) export PATH := $(makefile_dir):$(PATH) project_name ?= project_main ?= src/.hs retag_file ?= $(project_main) stack.yaml: @test -f stack.yaml || (echo -e "This makefile requires a 'stack.yaml' for your project.\nYou don't need to use 'stack' to build your project.\nYou just need a 'stack.yaml' specifying a resolver compatible with your GHC version.\nSee https://www.stackage.org/" && exit 1) stack: stack.yaml @which stack || (echo -e "This makefile requires 'stack' to be on your path. Use GHCup to install it.\nSee https://www.haskell.org/ghcup/" && exit 1) .PHONY: stack warning.txt: -@uname -a | grep -q Darwin && echo "WARNING: On Mac, you must alias 'make' to 'gmake' in your shell config file (e.g. ~/.bashrc or ~/.zshrc). Symbolic links will not work." | tee warning.txt @echo "Add 'warning.txt' to your .gitignore file if you never want to see this message again." hasktags: warning.txt stack @echo 'stack exec -- hasktags' > hasktags @chmod +x hasktags @echo "You might like to add 'hasktags' to your .gitignore file." format: stack @stack exec -- fourmolu --stdin-input-file $(project_main) .PHONY: format retag: warning.txt stack @stack exec -- haskdogs -i $(retag_file) --hasktags-args "-x -c -a" | sort -u -o tags tags .PHONY: retag tags: warning.txt hasktags stack @stack exec -- haskdogs .PHONY: tags ghcid: stack @stack exec -- ghcid \ --command 'stack repl --ghc-options "-fno-code -fno-break-on-exception -fno-break-on-error -v1 -ferror-spans -j"' \ --restart stack.yaml \ --restart $(project_name).cabal \ --warnings \ --outputfile ./ghcid.txt .PHONY: ghcid

I don't know what FreeBSD's reasons for removing Haskell from the ports tree was -- but in any case, Haskell likes to have its own development & runtime environments. The recommended method (for Linux, as well as FreeBSD) to install the package managers (cabal & stack), & the toolchain nowadays is 'ghcup': https://www.haskell.org/ghcup/

If you want a solid understanding of FP and not just FP in Scala, I highly recommend installing GHCup and working through Haskell Programming From First Principles. Then I would work through Scala With Cats, Essential Effects, and Practical FP in Scala for how all of that maps onto Scala.

Follow the instructions here: GHCup