Rest SDK : How to force request to finish?

Hello,

I would like help doing the following:

1. I would like to use the oData (SDK.REST.retrieveMultipleRecords) in order to retrieve multiple records

2. After retrieval of those records I would like to perform several actions on the data.

I have included those steps in an iteration. Each request needs data from the previous request.

My problem is that I need to force the REST request to finish before proceeding with the next one.

Is it possible to do this?

Thank you in advance.