Why are the results so truncated? I can't debug my code with something like:

With k = 1, arr = 47,81,43,130,32,107,311: expected 'Rearrangement: 107, 130, 311, 32, 43,…' to equal 'Rearrangement: 107, 130, 311, 32, 43,…'

Cool kata! First tried the brute force approach and timed out. Then realized this is a puzzle and not a plotting exercise. Gave it some thought away from the computer and came up with a solution.

Fun to solve. Thanks. Good graphics in the description - very helpful.

I'd suggest adding a test case for when the mean is equal to one of the found numbers. I was passing the random tests most of the time until this scenario occured.

I made changes based on your comments. Does it look any better?

I tried to paste my solution into the index.js file on the linked website but it seems to be read only. I even logged in but no dice.

In the description under Examples you show the output for sample test 4 being { A: 114, B: 90, C: 106, D: 116 }. That is the output I get but the test yeilds this result:

expected { A: 114, B: 90, C: 106, D: 116 } to deeply equal { A: 118, B: 94, C: 110, D: 120 }