shortestSame = digits => {
let last = digits[0];
let min = Infinity;
let run = 1;
for (let i = 1; i < digits.length; i++) {
if (digits[i] === last) {
run++;
} else {
if (run >= 2) min = Math.min(min, run);
last = digits[i];
run = 1;
}
}
if (run >= 2) min = Math.min(min, run);
return min;
}