Eric Milles created GROOVY-8870:
-----------------------------------
Summary: Spread-dot operator on list of lists
Key: GROOVY-8870
URL: https://issues.apache.org/jira/browse/GROOVY-8870
Project: Groovy
Issue Type: Documentation
Reporter: Eric Milles
I'm not sure if this is intended, but I ran into some nice/useful behavior of
the spread-dot operator when applying to a list of lists. I was trying to use
{{collectMany}} and found that I would need to do an inner {{collectMany}} or
switch to {{inject}}. But spread-dot plus {{flatten}} handled the situation
very nicely.
Could you please add a note on this to the documentation (section 1.2.8 --
other operators)? I don't think it is common knowledge that spread-dot does
not always gather up results in a flat list.
{code:groovy}
class Foo {
String thing
}
class Bar {
List<Foo> foos
}
class Baz {
List<Bar> bars
}
List<Foo> f = [new Foo(thing:'1'), new Foo(thing:'2')]
assert f*.thing == ['1','2']
List<Bar> b = [new Bar(foos:f), new Bar(foos:f)]
assert b*.foos*.thing == [['1','2'], ['1','2']]
assert b*.foos*.thing.flatten() == ['1','2','1','2']
// this was my use case:
List<Baz> z = [new Baz(bars:b), new Baz(bars:b)]
assert z*.bars*.foos == [[f, f], [f, f]]
assert z*.bars*.foos*.thing == [[['1','2'], ['1','2']], [['1','2'], ['1','2']]]
assert z*.bars*.foos*.thing.flatten() == ['1','2','1','2','1','2','1','2'] //
for the win!
{code}
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