# Timeline for Find the first duplicated element

### Current License: CC BY-SA 3.0

3 events
when toggle format what by license comment
Aug 4 '17 at 7:28 history edited
Aug 4 '17 at 5:29 comment You may return a zero instead of ¯1, so {⊃⍵[(⍳⍴⍵)~⍵⍳⍵]} should do.