Life & fun · alternatives · 2026

24 alternatives to Returnif – the conditional return statement

Personal website of Adam Suczewski

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Returnif – the conditional return statement launched in 2018; newer entries below may have overtaken it.

1. 1
   “Statements and State”, the next chapter of my book on interpreters▲141

   2017 · craftinginterpreters.com · its alternatives →

2. 2
   Maybe Haskell▲60

   See what it’s like to program in a language without null.

   2015 · books.thoughtbot.com · its alternatives →

3. 3
   Purely Functional Data Structures▲61

   A guide to functional programming

   2016 · amazon.com · its alternatives →

4. 4OH
   Optimizing Higher Order Functions with Hypothetical Inverses▲55

   2016 · medium.com · its alternatives →

5. 5
   A design-by-contract Python package in ~100 lines▲58

   Greetings! A 2.5 weekends project to teach myself newer Python features (>= 3.10). Conditions are written as Lambda expressions that annotate parameters and return types, and coexist with type annotations. Symbols to share values between conditions are also supported to a limited extend.

   2022 · github.com · its alternatives →

6. 6RW
   Regexly – WYSIWYG Regex Playground for JavaScripters▲7

   2017 · regexly.chipto.io · its alternatives →

7. 7IA
   Implementing a Lispy Language in Haskell: Part 1▲6

   Software Engineer in New York specializing in Apple platforms

   2015 · harlanhaskins.com · its alternatives →

8. 8CA
   Clause: an expressive JavaScript contract system, inspired by clojure.spec▲8

   2017 · clause.js.org · its alternatives →

9. 9PJ
   Predict JavaScript variable names and types with CRFs (paper+poll)▲17

   2014 · srl.inf.ethz.ch · its alternatives →

10. 10
    The Julia Language▲10

    A high-level, high-performance dynamic programming language

    2017 · julialang.org · its alternatives →

11. 11
    Adas.ana – clojure productivity macros, a novel take on anaphoras▲5

    2018 · github.com · its alternatives →

12. 12CO
    Coast on Clojure: A full stack framework with a catchy name▲8

    2017 · medium.com · its alternatives →

13. 13
    A Semiring of Functions [pdf]▲9

    2016 · github.com · its alternatives →

14. 14LS
    Listifi – Sharable Lists▲5

    2021 · listifi.app · its alternatives →

15. 15
    Lambda Lessons▲6

    Pattern-matching, first-class functions, and more in Haskell

    2014 · stevekrouse.github.io · its alternatives →

16. 16RA
    Recursi – a recursive memory/logic puzzle▲5

    2014 · lkozma.net · its alternatives →

17. 17AA
    Awl, a toy Lisp language written in C and transpiled to JavaScript▲8

    2014 · skepsi.me · its alternatives →

18. 18AR
    An REPL oriented testing framework for Clojure(script)▲7

    2021 · fctorial.github.io · its alternatives →

19. 19
    Fuge, an Erlang Port of GitHub's Scientist Library▲6

    An Erlang library for carefully refactoring critical paths - sthadka/fuge

    2016 · github.com · its alternatives →

20. 20
    Recursive acknowledgment pattern▲5

    2016 · github.com · its alternatives →

21. 21CS
    Code search for Rust, Ruby, Haskell – with regex support▲5

    2019 · codesearch.aelve.com · its alternatives →

22. 22XR
    Xref-runner for Erlang▲7

    2015 · inaka.net · its alternatives →

23. 23
    Bad Language: A lisp-looking language with interpreter and JS compiler▲6

    A lisp-looking language with interpreter and compiler to JS - mcapodici/badlanguage

    2018 · github.com · its alternatives →

24. 24IC
    Interactive Course on JavaScript Closures▲7

    2021 · slip.so · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →