You spent so much time trying to see if you could do something, that you never thought to ask if you should do it.

Good catch. Just realised mine was inadequate and refactored.

Another nice addition would be to compare sentences like 'desperation' === 'A rope ends it!' which would require stripping anything not a-z/A-Z.

There's a missing test case, when duplicated characters are contained in a subject and not in the candidate.
Consider: subject, candidate = 'daa', 'add' Will return true for most of the submissions

It doesn't sort...