JAVASCRIPT

javascript Arrow Function with Promises and Callbacks

// ES5
asyncFunction().then(function() {
    return asyncFunction1();
}).then(function() {
    return asyncFunction2();
}).then(function() {
    finish;
});

javascript Arrow Function with Promises and Callbacks

// ES6
asyncFunction()
.then(() => asyncFunction1())
.then(() => asyncFunction2())
.then(() => finish);