Promisses

const myPromiseObj = new Promise(function (resolve, reject) {
    // sundae creation code
    setTimeout( ()=> {
        if(false){ // test true or false
            resolve('ok');    
        } else{
            reject('ops!')
        }
    }, Math.random() * 4000)
    
});

myPromiseObj.then(function(resp){
    console.log(resp);
}, function(msg){
    console.log(msg);
});