jQueryPromise.js

function get(url) {
  return new Promise((resolve, reject) => {
    $.get(url, {success: resolve, error: reject})
  });
}

no-promise.js

request.get('url', (error, result) => {
	if (error) {
		console.error(error);
	} else {
		request.get(result, (error, result) => {
			if (error) {
				console.error(error);
			} else {
				console.log(result);
		});
	}
});

nodeRequestPromise.js

function requestWithPromise(method, url) {
  return new Promise((resolve, reject) => {
    request.call(method, url, (error, result) => {
      if (error) {
        reject(error);
      } else {
        resolve(result);
      }
    });
  });
}

promise.js

// fetch is a newer api that does http requests and returns a promise for them
fetch('someUrl')
 .then(result => fetch(result))
 .then(result => console.log(result))
 .catch(error => console.error(error))

wrapAsync.js

function wrapAsync(asyncFunc) {
  return function wrappedFunc(...args) {
    return new Promise((resolve, reject) => {
      asyncFunc(...args, (error, result) => {
        if (error) {
          reject(error);
        } else {
          resolve(result);
      });
    });
  }
}