Java 8 modify stream elements

Question

I wanted to write pure function with Java 8 that would take a collection as an argument, apply some change to every object of that collection and return a new collection aft

Answer 1

Streams are immutable like strings so you cannot get around needing to create a new stream/list/array

That being said you can use .Collect() to return a new collection post change so

List result = inList.stream().map().Collect()