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[CLJ-1095] Allow map-indexed to accept multiple collections (a la map) Created: 25/Oct/12  Updated: 15/May/17

Status: Open
Project: Clojure
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Feature Priority: Trivial
Reporter: Bo Jeanes Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None

Attachments: Text File 0001-map-indexed-accepts-multiple-collections.patch     Text File 0002-Add-test-for-multi-collection-map-indexed-fn.patch    


Bring external interface of map-indexed in line with map. Existing usages of map-indexed unchanged both in implementation and interface.

(map vector (range 10 20) (range 30 35)) ;=> ([10 30] [11 31] [12 32] [13 33] [14 34])
(map-indexed vector (range 10 20) (range 30 35)) ;=> ([0 10 30] [1 11 31] [2 12 32] [3 13 33] [4 14 34])

The attached patch is not necessarily the best implementation (I haven't benchmarked it or tried any alternatives yet) but hopefully enough to start a conversation about whether this is an addition that is warranted. I know I wished for this behavior a few weeks ago though I ended up finding another way.

(I haven't sent my CA yet, but I have it signed and ready to send in the next few days)

Comment by Aaron Bedra [ 25/Oct/12 5:11 PM ]

Can you add a test for the improved functionality?

Comment by Bo Jeanes [ 25/Oct/12 5:20 PM ]

You bet. I tried to before submitting this but found no existing tests for map-indexed to expand upon. Given that, I decided to just start the conversation first. If you think this is a good addition, I'll find a place to stick the tests and add a new patch file.

Comment by Bo Jeanes [ 25/Oct/12 8:05 PM ]

Add two unit tests for map-indexed. One tests old behavior (single collection) and the second tests mapping across 3 collections.

There were no existing tests for map-indexed that I could see to expand upon (using git grep map-indexed src/clojure)

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