第 5 期(2019-05-12)：数组最大数最小数 about fe-practice-hard HOT 2 OPEN

function findMaxMin(arr) {
    return [Math.max(...arr), Math.min(...arr)];
}

const getMaxAndMinArray = (a = []) => {
  const l = a.length;
  if (l === 0) return [];
  if (l == 1) {
    return [a[0], a[0]];
  }
  let i = 0,
    j = l - 1,
    max = -Infinity,
    min = Infinity;
  while (i <= j) {
    if (a[i] < a[j]) {
      max = max > a[j] ? max : a[j];
      min = min < a[i] ? min : a[i];
    } else {
      max = max > a[i] ? max : a[i];
      min = min < a[j] ? min : a[j];
    }
    i++;
    j--;
  }
  return [max, min];
};