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[CLJ-1319] array-map fails lazily if passed an odd number of arguments Created: 08/Jan/14  Updated: 08/Sep/15  Resolved: 08/Sep/15

Status: Closed
Project: Clojure
Component/s: None
Affects Version/s: None
Fix Version/s: Release 1.8

Type: Defect Priority: Minor
Reporter: Stuart Sierra Assignee: Unassigned
Resolution: Completed Votes: 1
Labels: errormsgs, ft

Attachments: Text File 0001-CLJ-1319-Throw-on-odd-arguments-to-PersistentArrayMa.patch     Text File 0002-CLJ-1319-Throw-on-odd-arguments-to-PersistentArrayMa.patch    
Patch: Code and Test
Approval: Ok


If called with an odd number of arguments, array-map does not throw an exception until the map is realized, when it throws the confusing ArrayIndexOutOfBoundsException.

Example, in 1.5.1 and 1.6.0-alpha3:

user=> (def m (hash-map :a 1 :b))
IllegalArgumentException No value supplied for key: :b  clojure.lang.PersistentHashMap.create (PersistentHashMap.java:77)

user=> (def m (array-map :a 1 :b))
user=> (prn m)
ArrayIndexOutOfBoundsException 3

Approach: Catch on construction and throw same error as hash-map.

user=> (def m (array-map :a 1 :b))
IllegalArgumentException No value supplied for key: :b  clojure.lang.PersistentArrayMap.createAsIfByAssoc (PersistentArrayMap.java:78)

Patch: 0002-CLJ-1319-Throw-on-odd-arguments-to-PersistentArrayMa.patch
Screened by: Alex Miller

Comment by Alex Miller [ 08/Jan/14 11:01 AM ]

PersistentArrayMap.createAsIfByAssoc could check length is even to catch this

Comment by Jason Felice [ 27/Jan/14 1:01 PM ]

A better error message would be nice... this is the best I could think of.

Comment by Shogo Ohta [ 14/May/15 7:06 AM ]

I suffered from this problem recently. Anything to resolve before applying the patch?

Comment by Alex Miller [ 14/May/15 8:21 AM ]

The error message should match the message for hash-map:

user=> (hash-map 1 2 3)
IllegalArgumentException No value supplied for key: 3  clojure.lang.PersistentHashMap.create (PersistentHashMap.java:77)
user=> (array-map 1 2 3)
IllegalArgumentException Odd number of arguments when creating map  clojure.lang.PersistentArrayMap.createAsIfByAssoc (PersistentArrayMap.java:78)
Comment by Shogo Ohta [ 14/May/15 8:49 PM ]

Let me have a try. I just updated the patch!


Comment by Alex Miller [ 15/May/15 9:10 AM ]

Looks good.

Comment by Alex Miller [ 03/Aug/15 8:05 AM ]

Reopened - does not seem to have correct behavior in 1.8.0-alpha4.

user=> (array-map 1 2 3)
ArrayIndexOutOfBoundsException 3  clojure.lang.PersistentArrayMap$Seq.first (PersistentArrayMap.java:321)
user=> (def m (array-map :a 1 :b))
Comment by Alex Miller [ 03/Aug/15 8:17 AM ]

Doesn't like this was merged so moving to Ok but not closed for next round.

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