CSV Parser

csv_parser.js

let csv = `
year,amount,n
2016,123,1
2017,124,2
2018,125,3
2019,126,4
2020,127,5
2021,128,6
`;

let is_empty = x => !x;

function parse_csv(csv, { newline = "\n", seperator = ",", ignore_missing = true, header = undefined } = {}) {
    let lines = csv.split(newline).filter(l => !is_empty(l)).map(l => l.split(seperator));
    header = header || lines.shift();

    return lines.map((line, i) => Object.fromEntries(
        header.map((key, j) => {
            if (j > (line.length - 1) && !ignore_missing) throw new Error(`Missing element in data row ${i+1}, col ${j+1}`);
            return [key, line[j]];
        })
    ))
}

console.log(parse_csv(csv));