javascript - 对象数组 - 计算属性的平均值？

Question

所以我有这个对象数组

audioFeatures = [
    {danceability: 10, loudness: 2, instrumentalness: 4, energy: 5, acousticness: 7},
    {danceability: 6, loudness: 3, instrumentalness: 8, energy: 9, acousticness: 5},
    {danceability: 7, loudness: 5, instrumentalness: 6, energy: 2, acousticness: 5},
    {danceability: 8, loudness: 10, instrumentalness: 9, energy: 7, acousticness: 2},
]

我想计算每个属性的平均值，即可舞性应该 = (10+6+7+8)/4 等等。我已经通过大量的 for 循环完成了这项工作，但它似乎效率很低，我理想地希望最终得到一个包含我尚未弄清楚的平均值的对象。

有谁知道这样做的好方法。我正在用 JavaScript 进行编码，但任何建议都将不胜感激，我可以尝试实现它。我一直在尝试 map ，但不太清楚如何将其应用到此(也许嵌套 map 哈哈，这可能不是一个好主意)

Answer 1

你只需要两个for循环:

audioFeatures = [
    {danceability: 10, loudness: 2, instrumentalness: 4, energy: 5, acousticness: 7},
    {danceability: 6, loudness: 3, instrumentalness: 8, energy: 9, acousticness: 5},
    {danceability: 7, loudness: 5, instrumentalness: 6, energy: 2, acousticness: 5},
    {danceability: 8, loudness: 10, instrumentalness: 9, energy: 7, acousticness: 2},
]

const average = {};

for (const feature of audioFeatures) {
  for (const [key, value] of Object.entries(feature)) {
    if (!average[key]) average[key] = 0;
    average[key] += value / audioFeatures.length;
  }
}

console.log(average);