Question

我正在尝试从数组中排除“ 0”值，以获得更好的平均结果。

我的数组是：[0，0，0，0，80，90，100，0]


function clacGPA(gradeData) {
  var sum, avg = 0;

  if (gradeData.length) {
    sum = gradeData.reduce(function (a, b) {
      return a + b;
    });
    avg = sum / gradeData.length;
  }
  document.getElementById('gpa').innerText = avg.toFixed(2);
}


My expected result should be:
avg = 80+90+100 / 3

Answer 1

只需先过滤掉0个值：

clacGPA([0, 0, 0, 0, 80, 90, 100, 0]);
function clacGPA(gradeData) {
  const filtered = gradeData.filter(item => item !== 0);
  const sum = filtered.reduce((a, b) => a + b);
  const avg = sum / filtered.length;
  console.log(avg);
}

Answer 2

您可以将函数reduce与累加器一起使用，该累加器存储计数和总和。

let arr = [0, 0, 0, 0, 80, 90, 100, 0];
let result = arr.reduce((a, c) => {
  if (c !== 0) {
    a.count++;
    a.sum += c;
  }
  
  return a;
}, {count: 0, sum: 0});

if (result.count) console.log(result.sum / result.count);

计算平均值时如何从数组中排除零值？

2 个答案: