函数仅返回初始化值-Javascript

Question

我有点困惑，为什么下面的函数的return语句只显示我的初始化值。 输入是整数数组，我期望一个[x,y]值数组，但它一直都在返回初始值[0,0]。 任何想法都请我在这里想念...

const scores = [10, 5, 20, 20]

function breakingRecords(scores) {
  let minAndMaxQuantity = [0, 0];
  let minAndMax = [0, 0]
  scores.map((element, i) => {
    if (i == 0) {
      // first one is max and 2nd min
      minAndMax[0] = element
      minAndMax[1] = element
    } else {
      switch (element) {
        case minAndMax[0] < element:
          minAndMax[0] = element
          minAndMaxQuantity[0] = minAndMaxQuantity[0] + 1;
          break;
        case minAndMax[0] > element:
          minAndMax[1] = element
          minAndMaxQuantity[1] = minAndMaxQuantity[1] + 1;
          break;
        case minAndMax[0] == element || minAndMax[1] == element:
          break;
      }
    }
  })
  return minAndMaxQuantity;
  // returning [0,0] every time
}

console.log(breakingRecords(scores))