Either I'm seriously misunderstanding the kata, or there is something incredibly wrong with the random tests in Haskell.

Falsifiable (after 5 tests and 9 shrinks):
  0.0
  -2.0
  Positive {getPositive = 1.0}
Test Failed
expected: 1.0 within margin of 1.0e-6
 but got: 0.0

0 and -2 are at the same point on a circle with circumference 1, are they not?

please see this js fork

js fork (helped by katafix)

• makes description language-agnostic
• uses mocha/chai assertions
• uses lodash for randomness (and some helper func)
• adds randomly generated word

Description should be language-agnostic

Done by someone

cool

Ohh... Thanks for your time, and reply.
Have a nice day!

An issue is a bug with the kata. This is not a bug with the kata, it's a bug with your code. You don't return an iterable with any inputs. In the case of the first sample test, the code won't even reach your return line. For javascript, you should be returning an Array.

I've get this message for the tests in Javascript:

TypeError: twoSum is not a function or its return value is not iterable
at doTest (test.js:17:26)
at Context. (test.js:32:5)
at process.processImmediate (node:internal/timers:471:21)

Approved

JavaScript fork (author inactive)

• Changed assertion messages (resolves this issue)
• Updated to Node 18 and chai
• Added a sample test that addresses this issue

this kata is more than 10 years old. Classes were introduced in ES2015. (by the way, classes are no longer merely syntactic sugar for prototypal objects; private class features for instance can hardly be emulated with pre-ES2015 JavaScript)

why not use a class? I get that a class is just syntactical sugar and it's doing this under the hood but why do it like this?

After ten years, I guess nobody is taking your suggestion. Closing.