JEP 186: Collection Literals
spullara at gmail.com
Thu Jan 16 14:40:26 PST 2014
I mostly agree with this. Typed tuple liberals would be more useful to me as an API developer. Sam
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>> Library-based solutions for maps are less good.
> But would be better if/when we have tuples/value types.
Now, there’s a feature that I definitely jump on a bandwagon for: tuples. I would most certainly prioritise tuples over collection literals, precisely because it makes it so much easier to implement fluent collection libraries. With type-safe, fixed-arity tuples as a language feature, it would be a relatively minor step to add syntactic sugar for (un-?) boxing tuples into collections (or any other object for that matter). I don’t find Zhong Yu’s example of:
Person person = ["Paul”];
that terrifying if there is a
constructor defined somewhere. Or, heck,
@Implicit public Person(String name);
works for me as well. But is it really necessary if you can just write:
Map<String, Integer> m = ImmutableMap.of((“First”,1), (“Second”, 2));
How to implement fixed-arity, type-safe tuples in a transparant fashion without something like C++11’s variadic templates or Scala’s Tuple1<T1>, Tuple2<T1,T2>… is a different matter. Maybe invoke dynamic will save the day here too.
-- Jonathan Ross
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