# Configuring the mapping

Use functions to define the transformations to perform on your structures. The following examples illustrate a few complex mapping patterns.

### In this section

* [Combining nested loops into a simple loop](https://help.qlik.com/talend/en-US/data-mapper-user-guide/8.0-R2024-12/combining-nested-loops-into-simple-loop)
* [Aggregating nested loops into a simple loop](https://help.qlik.com/talend/en-US/data-mapper-user-guide/8.0-R2024-12/aggregating-nested-loops-into-simple-loop)