Difference of using async / await vs promises?

Question

I am looking for a answer on what to use in my nodeJS app.

I have code which handles my generic dB access to mssql. This code is written using an async

Answer 1

Actually it depends on your node version, But if you can use async/await then your code will be more readable and easier to maintain. When you define a function as 'async' then it returns a native Promise, and when you call it using await it executes Promise.then.

Note: Put your await calls inside a try/catch, because if the Promise fails it issues 'catch' which you can handle inside the catch block.

try{
let res1 = await your-async-function(parameters);
let res2 = await your-promise-function(parameters);
await your-async-or-promise-function(parameters);
}
catch(ex){
// your error handler goes here
// error is caused by any of your called functions which fails its promise
// this methods breaks your call chain
}

also you can handle your 'catch' like this:

let result = await your-asyncFunction(parameters).catch((error)=>{//your error handler goes here});

this method mentioned does not produce an exception so the execution goes on.

I do not think there is any performance difference between async/await other than the native Promise module implementation.

I would suggest to use bluebird module instead of native promise built into node.