Repetitive then/catch method on Javascript [closed]

As I am not sure on how your Promises work, this is what I can come up with.

To reduce your catch nesting you could make each promise return another promise. This would force you to have a general .then and a general .catch after your updateUser method.

I stubbed a bit of code here:

var updateUser = new Promise(function(resolve, reject) {
  resolve("Promise one");
});

var updateOrCreateAddresses = new Promise(function(resolve, reject) {
  reject("Promise two"); // e.g. replace reject with resolve to see it "pass"
});

var updateOrCreateBalances = new Promise(function(resolve, reject) {
  resolve("Promise three");
});

var success = () => {
    alert("Success");
}

updateUser.then( x => {
    return updateOrCreateAddresses.then(y => {
        return updateOrCreateBalances.then(z => {
            return success;
        })
    })
})
.then(a => a())
.catch(err => alert(err));

What happens there? Each promise is returning another promise. If one promise fails, the promise will return the "error" to it's parent, where on updateUser the promise get's finally caught.