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 Moris Zucca CC BY-SA 3.0
added 455 characters in body
Aug 4 '17 at 5:29 comment added Adám You may return a zero instead of ¯1, so {⊃⍵[(⍳⍴⍵)~⍵⍳⍵]} should do.
Aug 2 '17 at 13:11 history answered Moris Zucca CC BY-SA 3.0