fieldparameter is a 2D array e.g.[[1,0,0], [0,0,0], [0,0,0]]- funtion returns tuple with two elements e.g.
[1,0]
const mineLocation = field =>
(idx => [idx, field[idx].indexOf(1)])
(field.findIndex(val => val.includes(1)));
Context: https://www.codewars.com/kata/reviews/528d9c38cc451c8fc900061a/groups/5ff705c6118f8e0001764f6a