initial setup and Hello World exercise by TheRealOwenRees · Pull Request #3 · exercism/rescript

TheRealOwenRees · 2026-03-07T10:57:40Z

Initial commit

boilerplate code and Rescript setup copied from the work of tesjasbubane mentioned on the forum post
Testing setup in accordance to previous completed work, using Rescript-Test
Hello World exercise added
npm run ci is the command from previous work which will compile ReScript files into JS and then test those. No doubt this command will need renaming.

BNAndras

Made some notes. The main thing is to not set the track to active until we're ready to launch and have received feedback from other maintainers on the track / online editor

.github/workflows/test.yml

bin/verify-exercises

BNAndras · 2026-03-07T16:34:46Z

exercises/practice/hello-world/.docs/instructions.md

This is an old set of instructions. We don't need to do it right this moment, but before launch, let's make sure to have configlet sync docs and metadata for everything.

config.json

…omplained that it exceeded the number of characters allowed

BNAndras · 2026-03-08T00:45:50Z

config.json

    "indent_style": "space",
-    "indent_size": 4
+    "indent_size": 2,
+    "highlightjs_language": "reasonml"


How close is the ReasonML syntax for highlighting purposes? https://github.com/tsnobip/highlightjs-rescript might be a possibility. Exercism can load that NPM package or we can even spin up our own if we’re feeling particularly motivated.

about 90% of the ReasonML syntax highlighting should work, but then it will fail on piping and parametric polymorphism. The package you linked looks good.

TheRealOwenRees · 2026-03-08T13:52:52Z

exercises/practice/hello-world/tests/HelloWorld_test.res

skip utility function mimics test skipping, logging the test name to console (is that needed?). I added a skipped test here just to prove it works, and now CI is passing when unskipping.

No library change.

That might be confusing to students. I think it’s fine to forego skips with the current testing framework. Skipped tests are preferred if reasonably possible but not obligatory.

BNAndras · 2026-03-08T17:56:36Z

exercises/practice/hello-world/.meta/testTemplate.js

+  assertion(~message?, ~operator="stringEqual", (a, b) => a == b, a, b)`;
+
+/**
+ * @param {string} testMethod - 'test' or 'skip'


My inclination is that the test generator should handle setting subsequent tests to be skipped at the end. The template here then is only concerned with setting up this specific case so it’s isolated and easier to reason about.

BNAndras · 2026-03-08T17:59:12Z

exercises/practice/hello-world/.meta/testTemplate.js

@@ -0,0 +1,15 @@
+export const slug = 'hello-world';
+
+export const assertionFunctions = `let stringEqual = (~message=?, a: string, b: string) =>


Would it make sense to build and document a small library of common assertion functions that can be pulled into templates? We can still have custom functions for more complicated assertions, but then we don’t need to reinvent things like checking if a returned value is true of not.

Yes I think this would be a good idea. I will scour through the rest of the exercises already implemented for this track in my repo and add those assertions for now, and add more as we move forward

BNAndras · 2026-03-08T18:00:54Z

exercises/practice/hello-world/.meta/testTemplate.js

+export const template = (testMethod, c, moduleName) => {
+  return `${testMethod}("${c.description}", () => {
+  stringEqual(~message="${c.description}", ${moduleName}.hello(), "${c.expected}")
+})\n\n`;


the generator should add the new lines here not the template. That means there would be less of a chance for things being formatted incorrectly.

BNAndras · 2026-03-08T18:02:30Z

exercises/practice/hello-world/tests/HelloWorld_test.res

That might be confusing to students. I think it’s fine to forego skips with the current testing framework. Skipped tests are preferred if reasonably possible but not obligatory.

BNAndras · 2026-03-08T18:04:59Z

exercises/practice/hello-world/LICENSE

bin is usually where that goes. I think we should create a template folder at the repo root that has these extra files in the relative spots where they are expected to go in the final exercise folder. Then you can copy the template folder to the exercise folder after configlet create does its thing.

BNAndras · 2026-03-08T18:08:55Z

.gitignore

Oh I thought this was in the hello world folder. We might as well give the students a .gitignore file in the exercise like the JS track does. At minimum, that means they won’t accidentally commit node_modules if they’re adding their solutions to a GitHub repo.

TheRealOwenRees added 9 commits March 7, 2026 11:53

initial setup and Hello World exercise

fb9ac5d

update formatting

1562c3e

update placement of dependencies to allow tests to run

6761c64

remove ad ignore build artifacts

2a15d84

pass verify_exercise script

0939121

correct formatting

d592579

setup CI stage

1953c96

change testing command

3a5d6cf

update node_modules symlink

421ec24

BNAndras reviewed Mar 7, 2026

View reviewed changes

TheRealOwenRees added 7 commits March 7, 2026 18:16

set track to inactive

bafa6a2

update config with file slugs and interface file

90bb5fa

update functions placeholder text and create interface file

e03f731

added therealowenrees as co-author

b37106e

set setup-nide action to a v4 commit

2229a38

interop used instead of interoperability in one title as the linter c…

e0e6464

…omplained that it exceeded the number of characters allowed

reformat config

2bea052

BNAndras reviewed Mar 8, 2026

View reviewed changes

TheRealOwenRees added 3 commits March 8, 2026 11:01

fix typo in function name - exemplar

3781718

typo fix in JavaScript

7c0c5a1

skip tests, unskip when verifying exercise

9bcb8cd

TheRealOwenRees commented Mar 8, 2026

View reviewed changes

TheRealOwenRees added 2 commits March 8, 2026 16:39

sync docs and config

6381647

basic test generator

840ce52

BNAndras reviewed Mar 8, 2026

View reviewed changes

TheRealOwenRees added 2 commits March 8, 2026 19:53

remove skipping of tests for now

cf1f8fc

write test in generator, leaving template for a template string

a808ea7

TheRealOwenRees merged commit 53d07b0 into exercism:main Mar 8, 2026
2 checks passed

TheRealOwenRees deleted the hello-world branch March 8, 2026 21:10

BNAndras mentioned this pull request Mar 9, 2026

Exercises to Add #5

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24 tasks

BNAndras added x:size/large Large amount of work x:type/docs Work on Documentation x:module/practice-exercise Work on Practice Exercises labels Mar 9, 2026

BNAndras mentioned this pull request Mar 9, 2026

Launch tracking #1

Open

28 tasks

		@@ -0,0 +1,15 @@
		export const slug = 'hello-world';

		export const assertionFunctions = `let stringEqual = (~message=?, a: string, b: string) =>

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