Two information which may help other codewarriors, which are missing (or I could not deduce it from the kata details) from the details of this kata (for those who, like me, did not know how the Enigma machine works):

1- The "Dot" letter has an influence on the notch. As a matter of fact, the dot letter leads to an offset between the notch and the visible position in the window.
Example:
If notch is "Q" and dot letter is "A", then the notch causes rotation when "Q" is displayed in the window. No change, Dot is in initial position.

If notch is "Q" and dot letter is "Z", then the notch causes rotation when "P" is displayed in the window, because Z has an offset of 25 towards A (0 position) => Q + offset of 25 gives "P".

If notch is "Q" and dot letter is "M", then the notch causes rotation when "C" is displayed in the window, because M has an offset of 12 towards A (0 position) => Q + offset of 12 gives "C".

2- When kata says "While in the actual usage of the original Enigma Machine, punctuation was encoded as words transmitted in the stream, in your code any input character that is not in the range A-Z should be returned unchanged and should not affect the internal state of the machine.", the "A-Z" is to be case-sensitive understood.

That is "A-Z" will be ciphered and crypted, punctuation will leaves the machine status as is (no rotation, no ciphering) ... but range "a-z" will ALSO remains untouched.

missing useful imports.

import codewars_test as test
from solution import how_many_moves

Description should be language-agnostic

Java translation

python new test frameworks

As stated at Wikipedia:

For discrete distributions, there is no universal agreement on selecting the quartile values.

So I think it should be mentioned in description that which method(1, 2, 3, or 4) should be used for calculating lower and upper quartile of a sequence with odd number of data.

python new test framework is required. updated in this fork

In Java, it is rather hard to read values from Limit if the names of the exposed variables are never mentioned, and the definition of Limit is not available.

Also missing an edge case where required = 0 and hence should return 0.

The kata needs actual random tests: the only places where the test case are randomized all expects -1.

• Description should be language-agnostic

• The range of n should be stated

If you want to actually test our knowledge of is_correlation_causal, you can't just put in a return value in initial code that can pass the tests: it doesn't teach anything if we don't even to touch it in the first place. At least it should be something like pass.

Even the linked Wikipedia article contains multiple definitions of correlation coefficient, so it's unclear which one is expected.