asyncAdd.js

function addPromise(a,b){
    return resolve(a,b);
}

addPromise(2,3).then(function(data){
    console.log(data);
},function(err){
    console.log('oh noes!');
});

//the error could be called if say this other function returns a promise and errored

somethingelse().then(function(data){
    return addPromise(data,2);
}).then(function(data){
    console.log(data);
},function(err){
    console.log('oh noes!');
});