Migrate Enumerable to use an iteratees based solution #1922
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added 16 commits
December 11, 2013 15:01
Details are described in the Enumerable docs. This new implementation allows us to implement interleaving functions (like zip) while avoiding a huge penalty in regular enumeration.
…uples The motivation behind this change is to not force every application to implement count/1 and member?/2 manually. It also allows us in the future to add functions like Enum.counted?/1 that will return true if count is pre-calculated.
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Cool stuff 👍 |
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Awesome work, josevalim. This will open a lot of doors. |
josevalim
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Dec 12, 2013
Migrate Enumerable to use an iteratees based solution
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This pull request migrates the Enumerable protocol to use a solution based on iteratees. This allow us to halt enumeration (cleaning up the implementation of functions like
take/2anddrop/2) and also adds the possibility of interleaving enumerables via suspend. To show case the new functionalities we got, this pull request considerably extends theStreamAPI, by adding functions likezip/2,chunks/4and more. More info can be found in the updated documentation for Enumerable. @pminten is also working on a blog post that explains the underlying mechanisms quite well.On the negative side, this pull request does backwards incompatible changes on how the Enumerable protocol works. For this reason, the next Elixir release will be tagged 0.12.0 (to be released this weekend).
Huge thanks to @jessitron for pairing with me on the initial implementation of iteratees. Feedback is welcome!
/cc @ericmj @pminten @devinus @meh