javascript - 计算平均值时如何从数组中排除零值？

Question

我试图从数组中排除“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

先过滤掉0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);
}