# Server Side Kotlin-06

       ### Introduction:-   
In the last post of this series, I discussed the Kotlin Collection 
 zip API. In this post, I will share how associate APIs work.      
 
     Association transformations make build maps for  collection elements with some certain values . In collection, elements can be either keys or values in the association map.

The basic association function associateWith() creates a Map in which the elements of the  collection are keys, and while transformation,these elements produces values.    

```val gameengines = listOf("unity", "unreal","godot")
println(gameengines.associateWith {it.length})```  
output   
```{unity=5, unreal=6, godot=5}```    
### Conclusion;-   
 You can see how this associate works. In the next post, I will explore the flatten APIs work.