Add Seq.sorted(Function)

[stephenh]

Currently sorting objects by an attribute can be done by, e.g. sorting by name:

   Seq(o1, o2).sorted((o1, o2) -> o1.getName().compareTo(o2.getName()))

Scala has a nice sortBy function that avoids calling .getName twice:

   Seq(o1, o2).sortBy(o -> o.getName());

Where the lambda returns a Comparable, so the .sortBy can do the .compareTo as needed.

[lukaseder]

I guess the standard way to sort by a function in Java 8 is to use:

seq(o1, o2).sorted(Comparator.comparing(o -> o.getName()))

I agree though, that a shortcut for the above as you suggested would be rather useful. I'll pull, but rename the method to the expected sorted(), to lessen the surprise for someone discovering the API

[stephenh]

Thanks! You're right that it's just a short cut.

FWIW Scala's Seq has Seq.sorted and Seq.sortBy as different method names, and I kind of like how the "sort by (function)" reads in my head, but sorted is perfectly fine too. I'll get used to it. :-)

[lukaseder]

Well, same story as over here: https://github.com/jOOQ/jOOL/issues/93#issuecomment-122901666. Besides (being a SQL person), the only reasonable reading would be ORDER BY anyway... ;)

[stephenh]

the only reasonable reading would be ORDER BY anyway... ;)

Of course. :-)