[GROOVY-2903] [ [a:1, b:2, c:3] ].flatten() -> [ 1, 2, 3 ]

• Type: Test
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6-beta-1
• Fix Version/s: 1.5.7
• Component/s: groovy-jdk
• Environment: Originally Run on OS-X
• Flags: Patch
• Assignee: Paul King
• Reporter: Robert Fischer
• Created: 14/Jun/08 23:34
• Updated: 05/Apr/15 14:44
• Resolved: 17/Jun/08 17:41

Description

The JavaDoc of flatten says: "This collection and any nested collections have their contents (recursively) added to the new collection." However, if it encounters a map, it exacts the value list and flattens that. This is odd on two points – 1) a Map is not a Collection, so it shouldn't be touched by #flatten according to that definition, and 2) there is no map#flatten which corresponds to this behavior.

This makes it sound like a bug to me, but there may be existing code dependent on the issue. So the attached patches just document and demonstrate the issue.

Issue Links

• relates to: GROOVY-2904 [ [a:1, b:2, c:3] ].flatten() -> [ 1, 2, 3 ], but should be [ [a:1, b:2, c:3] ]