RosettaCodeData/Task/Parsing-RPN-calculator-algo.../J/parsing-rpn-calculator-algo...

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rpn=: 3 :0
queue=. |.3 :'|.3 :y 0'::]each;: y
op=. 1 :'2 (u~/@:{.,}.)S:0 ,@]'
ops=. +op`(-op)`(*op)`(%op)`(^op)`(,&;)
choose=. ((;:'+-*/^')&i.@[)
,ops@.choose/queue
)