Problem 7 Max sequence

function findMaxSequence(arr) {
    var start = 1;
    var bestStart = 0;
    var bestLen = 0;
    for (var i = 0; i < arr.length; i++) {
        if (arr[i + 1] - arr[i] == 1) {
            start++;
        }else {
            start = 1;
        }
        if (start > bestStart) {
            bestStart = start;
            bestLen++;
        }
    }

    var result = arr.slice(bestLen - (bestStart - 1), bestLen + 1);
    return result;
}

console.log(findMaxSequence([3, 2, 3, 4, 2, 2, 4]));