npm install ay-callbackifynode callbackify promises
npm install ay-callbackify
`
$3
`javascript
const callbackify = require('ay-callbackify');
const promise = name => new Promise((resolve, reject) => setTimeout(resolve.bind(this, name), 100));
const callback = callbackify(promise);
callback('John Doe', (err, res) => err ? console.log(err) : console.log(res));
``