CoffeeScript translation

Repeated characters are to be ignored and non-alphebetic characters as well.

There should be fixed tests for that and currently, at least for javascript, the control function fails for a string with numbers in it (currently, not tested).

Updated JavaScript

• Updated to Node 18
• Uses chai

There should be fixed tests with non-alphabetical strings to prevent solutions doing {... for char_ in input_string if ...} or None

Aliasing a built-in is a worthless practice.

Returning inconsistent datatypes is not a best practice. Also, it is undefined if a non-empty string with only non-alphabetic characters is to return null or {}.

The JavaScript description uses non-JS language.

Not satisfied. :/

Is there a way to improve this to include an example of collision, else this becomes very easy.

I would consider adding an example in the instructions section.

Need some better example tests

Needs random test cases

I think that it is bad practice to return nil rather than an empty hash for an empty string.

So I suggest removing that condtion.

If you're NOT going to do that, at least add this test to the standard tests:

Test.assert_equals(char_to_ascii('$%^&#'), nil,'Returns nil if all characters are ignored');