Converts a 2D array to a comma-separated values (CSV) string.
Use Array.map() and Array.join(delimiter) to combine individual 1D arrays (rows) into strings.
Use Array.join('\n') to combine all rows into a CSV string, separating each row with a newline.
Omit the second argument, delimiter, to use a default delimiter of ,.
const arrayToCSV = (arr, delimiter = ',') =>
arr.map(v => v.map(x => `"${x}"`).join(delimiter)).join('\n');arrayToCSV([['a', 'b'], ['c', 'd']]); // '"a","b"\n"c","d"'
arrayToCSV([['a', 'b'], ['c', 'd']], ';'); // '"a";"b"\n"c";"d"'