Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.92%. Comparing base(4a4ed57) to head(9456fd6).

@@            Coverage Diff             @@##           master    #1641      +/-   ##==========================================- Coverage   83.94%   83.92%   -0.02%==========================================  Files         377      376       -1       Lines       19727    19698      -29       Branches     2917     2911       -6     ==========================================- Hits        16559    16532      -27+ Misses       3168     3166       -2

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This improves coverage of the existing implementation, but I think the existing implementation has a bug: According to Wikipedia

A twin prime is a prime number that is either 2 less or 2 more than another prime number

So the (a) twin prime of7 should be5.

What should then be thetwinPrime(5)?

I have to admit that I did not get this function is supposed to do. It would be more natural to have a function likeisTwinPrime.

What should then be thetwinPrime(5)?

I think either 3 or 7 would be fine.

We may also remove this function entirely, or replace it with an "is twin prime" variant as you suggest, IMO. It's just confusing (and trivial) as is.

What should then be thetwinPrime(5)?

I think either 3 or 7 would be fine.

We may also remove this function entirely, or replace it with an "is twin prime" variant as you suggest, IMO. It's just confusing (and trivial) as is.

I will remove it.