// (A) LOAD MODULES
// npm install csv-stringify csv-parser
// https://www.npmjs.com/package/csv-stringify
// https://www.npmjs.com/package/csv-parser
const fs = require("fs"),
      csvp = require("csv-parser"),
      csvs = require("csv-stringify");

// (B) READ CSV FILE
var rows = [];
fs.createReadStream("x-dummy.csv")
.pipe(csvp({ headers : false }))
.on("data", data => rows.push(data))
.on("end", () => {
  // (C) REARRANGE TO FLAT ARRAY
  rows.forEach((r,i) => rows[i] = Object.values(r));

  // (D) INSERT AT EXACT ROW
  rows.splice(3, 0, ["E", "F"]);

  // (E) SEARCH & INSERT AT ROW
  let at = null;
  for (let [i,r] of Object.entries(rows)) {
    if (r.includes("Jou Doe")) { at = i; break; }
  }
  if (at !== null) { rows.splice(at, 0, ["G", "H"]); }

  // (F) WRITE
  csvs.stringify(rows, (err, output) => {
    fs.writeFileSync("x-dummy.csv", output);
    console.log("OK");
  });
});