Callback to promise example

promise-from-callback.js

'use strict';

const Http = require('http');

Promise.resolve() //upper promise
.then(() => {

    //wrapping promise for resolving
    //callbacks
    return new Promise((resolve, reject) => {

        //callback method
        Http.get('http://example.com', (response) => {

            //send to promise resolve
            resolve(response);
        }).on('error', (err) => {

            //send to promise reject
            reject(err);
        });
    });

})
.then((response) => {

    console.log('status:', response.statusCode);
    response.pipe(process.stdout); //pipe body to stdout
})
.catch((err) => {

    console.log('error:', err);
});