arrays - 将数据集转换为正确的CSV表示法以使用JavaScript下载

利用@Heretic Monkey（用于转置数据）和@codeWonderland（用于添加类别名称）的部分建议，我得出了以下解决方案：

// Reference to pulled-data arrays
let data = [
  this.set1
  this.set2
  this.set3
  this.set4
  this.set5
];

// NEW
// Reference to data array names in same order as aforementioned data array
const dataNames = [
  'set1',
  'set2',
  'set3',
  'set4',
  'set5',
]

// NEW
// Add label to each column
data.forEach((datum, index) => {
  datum.unshift(dataNames[index]);
});

// Convert data arrays to CSV format
const CSVURL = 'data:text/csv;charset=UTF-8,';
let transposedData = data[0].map((col, i) => data.map(row => row[i])); // NEW: TRANSPOSE DATA
let formattedData = transposedData.map(e => e.join(',')).join('\n'); // Modified
let encodedData = CSVURL + encodeURIComponent(formattedData);

// Generic download CSV function
downloadFile('name.csv', encodedData);

还注意到@Kosh Very最近增加了替代列标记，引用为：

// pull arrays by headers
data[0].forEach(h => data.push(this[h]));