How to take the first line from txt, assign it to a variable, delete it and put it at the end of the same txt (Node.js)?

Question

Node.js

'fs' module. Async is not needed. Judging by the search, the most difficult thing is to delete the line.

Answer 1

const fs = require("fs");

fs.readFile('file.txt', (err, data) => {
    if (err) {
        throw err;
    }

    let fileRows = data.toString().split('\n');

    let firstRow = fileRows.shift();

    fileRows.push(firstRow);

    const fileData = new Uint8Array(Buffer.from(fileRows.join('\n')));

    fs.writeFile('file.txt', fileData, (err) => {
        if (err) {
            throw err;
        }

    });

});