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

Use Array.prototype.slice() and Array.prototype.indexOf('\n') to remove the first row (title row) if omitFirstRow is true.
Use String.prototype.split('\n') to create a string for each row, then String.prototype.split(delimiter) to separate the values in each row.
Omit the second argument, delimiter, to use a default delimiter of ,.
Omit the third argument, omitFirstRow, to include the first row (title row) of the CSV string.


const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>
    .slice(omitFirstRow ? data.indexOf('\n') + 1 : 0)
    .map(v => v.split(delimiter));


CSVToArray('a,b\nc,d'); // [['a','b'],['c','d']];
CSVToArray('a;b\nc;d', ';'); // [['a','b'],['c','d']];
CSVToArray('col1,col2\na,b\nc,d', ',', true); // [['a','b'],['c','d']];