RosettaCodeData/Task/Reflection-Get-source/J/reflection-get-source-1.j

   mean=:+/ %#
   5!:5 <'mean'
+/ % #
   5!:6 <'mean'
(+/) % #
   4!:4 <'mean'
_1
   4!:4 <'names'
2
   2 { 4!:3 ''
┌────────────────────────────────────────────┐
│/Applications/j64-804/system/main/stdlib.ijs│
└────────────────────────────────────────────┘