Fair enough, point taken. Thanks.

Something very odd about this kata

all but one test passed, the failed test gives the error -
[ 0, 1, 2, prop: 3 ] 3 Array with added property - Expected: '[1, 2]', instead got: '[0, NaN]'

yet in the instructions it clearly states

The input will always be valid (numbers will be an array of length 2 or greater, and all of the items will be numbers...

so what the hell is prop: 3 and why is it in the array?