Collect only if result is not null

Question

I have a collection and I'm wanting to find certain elements and transform them. I can do this in two closures but I was wondering if it is possible with only one?

def c = [1, 2, 3, 4]  def result = c.findAll {     it % 2 == 0 }  result = result.collect {    it /= 2 } 

My true use case is with Gradle, I want to find a specific bunch of files and transform them to their fully-qualified package name.

Answer 1

You can use findResults:

def c = [1, 2, 3, 4] c.findResults { i ->         i % 2 == 0 ?    // if this is true             i / 2 :    // return this             null        // otherwise skip this one     } 

Also, you will get [] in case none of the elements satisfies the criteria (closure)