const https = require('https');
const url = 'https://uinames.com/api/';

function request(url) {
  return new Promise((resolve, reject) => {
    let data = '';

    https
      .get(url, (res) => {
        res.on('data', (chunk) => data += chunk);
        res.on('end', () => resolve(JSON.parse(data)))
      })
      .on('error', (err) => reject(err));
  });
}

const names = [];
const uniqueNames = 5;
for (let i = 0; i < uniqueNames; i++) {
  request(url).then(success, error);
}

function success(d) {
  if (names.length === uniqueNames) {
    return;
  }

  if (!names.includes(d.name)) {
    names.push(d.name);
  } else {
    request(url).then(success, error);
  }

  if (names.length === uniqueNames) {
    console.log(names);
  }
}

function error(e) {
  console.log(e);
  setTimeout(() => {
    request(url).then(success, error);
  }, 3000);
}