Javascript | CSV Writer

function CSVWriter() {
  this.csv = "";

  this.addToLine = function (msg, { start } = {}) {
    const prefix = start ? "" : ",";
    this.csv += prefix + msg;
    return this;
  };

  this.completeLine = function () {
    this.csv += "\n";
    return this;
  };

  this.value = function () {
    return this.csv;
  };
}