Kata

• Description should be language-agnostic

• KATEX should be used to display equations

JS Node 18. should be enabled

• Python new test framework should be used

• Function and parameter name should be snake_case

• Unnessary logs should be removed

• Initial solution should be return 0 and all comments removed

• Ruby 3.0 should be enabled

• Function and parameter name should be snake_case

• Unnessary logs should be removed

Some of the languages return string (Haskell, JS, CS), other return double (Java, Ruby etc.). The output type across all languages should be consistent despite having to invalidate several solutions !

good kata for people who making master degree in math

The description says the result should be expressed as a string with .toFixed(2). This is true and makes sense for js, but in other languages 'toFixed' has no meaning and, above all, in Python, Clojure (and maybe in other languages I did not check) result is expected as a number rounded to 4th decimal. These incoherency and bad informations should be corrected.

If you are stuck here is some extra reading, for alternative : https://mathworld.wolfram.com/HarmonicConjugate.html

The function name should be in snake_case in Python and Ruby.

Both image links span whole description width not only the images.

It takes me one hour to finish it... not good :/

Some of the languages return string (Haskell, JS, CS,?), other return double (Java, Ruby). That's kind of random. Why not have all return double? Either let the user round to a specific precision, or use relative error checking.

Use Double instead of Float in Haskell. Unless you have harsh memory requirements, there's usually no reason to use single floating point precision number.