Þr
Characters: Þ, r
Þ
r
Remove the last item of a list and prepend 0. A shortcut for Ṫ0p
lst
[0] + a[:-1]
⟨1|2|3|4|5|6|7|8|9⟩ Þr
⟨0|1|2|3|4|5|6|7|8⟩
⟨⟩ Þr
⟨0⟩
`` Þr
`0`