Why Lists does not have a filter method

[ralph23]

Hi

I'm wondering why the class com.google.common.collect.Lists does not
have a filter method. Sets has a fillter method and Maps has
filterKeys and filterValues method.

I could use com.google.common.collect.Collections2.filter for
filtering a list but this method gives me a Collection back and not a
List.


Regards
Ralph

[Kevin Bourrillion]

We are suspicious of the value of Lists.filter().  The only reason to want a List back is for its index-based methods like get(5), but these methods would perform abysmally on a filtered List.  We think ImmutableList.copyOf(Iterables.filter()) is usually a better way.

--
Kevin Bourrillion @ Google
internal:  http://go/javalibraries
google-collections.googlecode.com
google-guice.googlecode.com

[ralph23]

Hi

Thanks for the explanation. I understand now why there is no such
method in Lists.
Thanks a lot

Ralph