RosettaCodeData/Task/Gotchas/J/gotchas-4.j

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A=: 2 3 5 7 11 NB. legal
B=: 999 NB. legal
B 0} A NB. functional array update (does not change A)
NB. the use of a single brace to denote indexing might also confuse people
999 3 5 7 11
0} A NB. legal
2
999 0} A NB. not legal
|rank error
(999)0} A NB. what was intended
999 3 5 7 11