title: CSVToArray tags: string,array,intermediate

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: string, delimiter = ",", omitFirstRow = false) =>
  data
    .slice(omitFirstRow ? data.indexOf("\n") + 1 : 0)
    .split("\n")
    .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']];