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#12 You know nothing (medium)
function withCallback (message, callback) {
function promisify (functionToCall) {
return function promisifiedFunction () {
// Before new Promise otherwise arguments value change
var callArguments = Array.from(arguments);
return new Promise (function (resolve, reject) {
// Defined here for resolve to be defined
var callback = function (result) {
var argumentsForFunction = callArguments.concat(callback);
functionToCall.apply(null, argumentsForFunction);
// Callback
withCallback('Callback', data => console.log(data));
// Promise
var withPromise = promisify(withCallback);
withPromise('One promise')
.then(data => console.log(data));
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