What you have is

 ({:} }:)t

t {:} }: t

[This is u}]

t (t {: }: t)} }: t


The linear display of ({:} }:) is wrong.

From your NuVoc ref it appears you want to use monad u}, but you are using the dyad here.

Henry Rich


On 12/10/2021 10:24 AM, R.E. Boss wrote:
I'm trying to solve the AdventOfCode puzzles, but at least half of my time I 
spend on troubles with J.
Mostly I make mistakes, because the rules of J are less intuitive then I 
presumed, but there is also inexplicable behavior, so in the end, J remains a 
black box for me.

   t
3  1  4  1  2  1  1  8  8  3  6  7  3  3  4  3  6  4  2  1  8  2  7  7
_6 _8 _5 _8 _7 _8 _8 _1 _1 _6 _3 _2 _6 _6 _5 _6 _3 _5 _7 _8 _1 _7 _2 _2
  0  0  0  0  0  0  0  1  1  0  1  1  0  0  0  0  1  0  0  0  1  0  1  1

    ({:} }:)t
|domain error
|       ({:}}:)t

obviously }} is interpreted as part of a direct definition, red in JQT, despite 
my blank.

   (}:}~ {:) t
|domain error
|       (}:}~{:)t

black box in optima forma.

Fortunately, as NUVOC mentions, } is a replacement of ( {"0 1&.|: ).
But it cost me too much time, reason to timebox my efforts for AOC.


R.E. Boss
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