Hi everyone,

I am studying the Outsystems documentation about Defining Asynchronous JavaScript Code with link:

Defining Asynchronous JavaScript Code - OutSystems 11 Documentation

There's a part that confuses me. I'm not sure what to thin of it. 

So, in the Call an Asynchronous Client Action part, there's a section wherein the documentation states this:

You can also act upon an unhandled error or a call to "$reject()" occurred in the asynchronous client action. To do that, do one of the following:

1. Add a second argument to the "then()" method. Its full signature is "then(onFullfilled, onRejected)", and the "onRejected" is a callback function called when "$reject()" is called in the asynchronous action, or
2. Chain the return value of the "then()" method, which is also a promise, with a "catch(onRejected)" method, that will handle the error case – this chaining process is called composition.

It then goes on and gives 2 examples

#Example1

#Example2

So, where my confusion comes in where the documentation says 

You can also act upon an unhandled error or a call to "$reject()" occurred in the asynchronous client action. To do that, do one of the following:

1. Add a second argument to the "then()" method. Its full signature is "then(onFullfilled, onRejected)", and the "onRejected" is a callback function called when "$reject()" is called in the asynchronous action, or

It talks about the signature "then(onFullfilled, onRejected)" but in the examples above, I do not see any explicit "second" function that caters to the onRejected. I see the catch which I understand, kind of does what is described but what I do not understand is why the documentation talks about "then(onFullfilled, onRejected)", two arguments. But then does not give an example on how it is constructed. Wondering if anyone can give me a sample code snippet on how to construct the "then(onFullfilled, onRejected) " where I can see a function that caters to OnRejected or at least clarify things for me. Thanks!