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Commonmark migration

edited Jun 17, 2020 at 9:04

APL (Dyalog Unicode), 4 bytes

\⍨⍳9

⍳9 ⍝ Integers 1..9
 ⍨ ⍝ Duplicate argument on each side
 \ ⍝ Replicate each element *n* times

Index Generator: ⍳5 = 1 2 3 4 5
Expand: 2 3 \ 1 4 = 1 1 4 4 4
Commute: +⍨4 = 4 + 4 = 8

answered Mar 18, 2020 at 5:24