30-seconds-of-code/snippets/arrayToCSV.md

arrayToCSV

Converts a 2D array to a comma-separated values (CSV) string.

Use Array.map() and String.join(delimiter) to combine individual 1D arrays (rows) into strings. Use String.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.join(delimiter)).join('\n');

arrayToCSV([['a', 'b'], ['c', 'd']]); // 'a,b\nc,d'
arrayToCSV([['a', 'b'], ['c', 'd']], ';'); // 'a;b\nc;d'