Java 8 - Best way to transform a list: map or foreach?

Question

I have a list myListToParse where I want to filter the elements and apply a method on each element, and add the result in another list myFinalList.

Answer 1

If using 3rd Pary Libaries is ok cyclops-react defines Lazy extended collections with this functionality built in. For example we could simply write

ListX myListToParse;

ListX myFinalList = myListToParse.filter(elt -> elt != null) .map(elt -> doSomething(elt));

myFinalList is not evaluated until first access (and there after the materialized list is cached and reused).

[Disclosure I am the lead developer of cyclops-react]