What are some cool/wierd features of a programming language you know?

This page summarizes the projects mentioned and recommended in the original post on /r/ProgrammingLanguages

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  1. langs

    For example all my implementations exist as a single, self-contained executable (here 'strinclude' plays a big part in including source code of libraries), which runs pretty quickly too. (Download Rust for example and you could be looking at 70,000 files. Try and email it to someone.)

  2. CodeRabbit

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  3. frank

    Frank compiler (by frank-lang)

    Frank's effect handling. "A strict functional programming language with a bidirectional effect type system designed from the ground up around a novel variant of Plotkin and Pretnar's effect handler abstraction. ... Frank [is different from other PLs with effect type systems in that it is based on] generalising the basic mechanism of functional abstraction itself. A function is simply the special case of a Frank operator that interprets no commands. Moreover, Frank's operators can be multihandlers which simultaneously interpret commands from several sources at once, without disturbing the direct style of functional programming with values. Effect typing in Frank employs a novel form of effect polymorphism which avoid mentioning effect variables in source code. This is achieved by propagating an ambient ability inwards, rather than accumulating unions of potential effects outwards."

  4. prolog-to-minizinc

    A Prolog-to-MiniZinc translator

    Prolog is a homoiconic language with built-in unification and backtracking. These features are remarkably useful for metaprogramming: I once wrote an interpreter for a functional programming language in less than 80 lines of Prolog code.

  5. ponyc

    Pony is an open-source, actor-model, capabilities-secure, high performance programming language

    I like what Pony does with capabilities.

  6. jellylanguage

    Jelly is a recreational programming language inspired by J.

    Jelly is a language related to APL which pretty much can't be written to be readable.

  7. perlweeklychallenge-club

    Knowledge base for The Weekly Challenge club members using Perl, Raku, Ada, APL, Awk, Bash, BASIC, Bc, Befunge-93, Bourne Shell, BQN, Brainfuck, C3, C, CESIL, C++, C#, Clojure, COBOL, Coconut, Crystal, D, Dart, Dc, Elm, Emacs Lisp, Erlang, Excel VBA, Fennel, Fish, Forth, Fortran, Gembase, GNAT, Go, Haskell, Haxe, HTML, Idris, IO, J, Janet, Java, JavaScript, Julia, Kotlin, Lisp, Lua, M4, Miranda, Modula 3, MMIX, Mumps, Myrddin, Nim, Nix, Node.js, Nuweb, OCaml, Odin, Ook, Pascal, PHP, Python, Post

    Love Damian Conway's perl talks. Especially his Raku talks. I especially love his explorations of solutions to the The Weekly Challenge - Perl and Raku

  8. granule

    A statically-typed linear functional language with graded modal types for fine-grained program reasoning

    Granule and the related Gerty languages feature graded modal types which afaiu can be used similar to linear types to specify the number of times a resource should be consumed in a function, which, unlike linear types, may be a variable amount instead of only exactly once.

  9. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

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  10. gerty

    A small implementation of graded modal dependent type theory. A younger cousin to Granule.

    Granule and the related Gerty languages feature graded modal types which afaiu can be used similar to linear types to specify the number of times a resource should be consumed in a function, which, unlike linear types, may be a variable amount instead of only exactly once.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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Did you know that Haskell is
the 25th most popular programming language
based on number of references?