JSFiddle - React, Tailwind, and code Playground

Babel + JSX

getArticleList().then(function(articles){
	return getArticle(articles[0].id);
}).then(function(article){
    return getAuthor(article);
}).then(function(author){
	alert(author.email);
});

function getAuthor(id){
    return new Promise(function(resolve, reject){
        $.ajax("http://beta.json-generator.com/api/json/get/E105pDLh",{
            author: id
        }).done(function(result){
            resolve(result);
        })
    });
}

function getArticle(id){
    return new Promise(function(resolve, reject){
        $.ajax("http://beta.json-generator.com/api/json/get/EkI02vUn",{
            id: id
        }).done(function(result){
            resolve(result);
        })
    });
}

function getArticleList(){
    return new Promise(function(resolve, reject){
       $.ajax(
        "http://beta.json-generator.com/api/json/get/Ey8JqwIh")
        .done(function(result){
            resolve(result);
        }); 
    });
}