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Make Optional implement Iterable #6

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Andersmholmgren wants to merge 1 commit into googlearchive:master from Andersmholmgren:master

Andersmholmgren commented Apr 3, 2016

Implementing Iterable allows an Optionals to be passed into anything expecting an Iterable and facilitates common cases like

final optionals = <Optional<int>>[
        new Optional<int>.of(1),
        const Optional.absent(),
        new Optional<int>.of(2)
      ];
final ints = optionals.expand((i) => i); // (1, 2)

Note: this PR is a dupe of google/quiver-dart#289. No idea where PRs should be filed now. Confusing


          Make Optional implement Iterable

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