Show a nested loop which searches a two-dimensional array filled with random numbers uniformly distributed over 



[
1
,
…
,
20
]


{\displaystyle [1,\ldots ,20]}

.

The loops iterate rows and columns of the array printing the elements until the value 



20


{\displaystyle 20}

 is met.

Specifically, this task also shows how to break out of nested loops.



Related tasks

   Loop over multiple arrays simultaneously
   Loops/Break
   Loops/Continue
   Loops/Do-while
   Loops/Downward for
   Loops/For
   Loops/For with a specified step
   Loops/Foreach
   Loops/Increment loop index within loop body
   Loops/Infinite
   Loops/N plus one half
   Loops/Nested
   Loops/While
   Loops/with multiple ranges
   Loops/Wrong ranges


  [] 
  5 times
    [ []
      5 times [ 20 random 1+ join ]
      nested join ]
 
  dup say "Array contains:" cr
  witheach 
    [ witheach 
        [ echo sp ]
      cr ] 
  cr
  say "Array up to item = 20:" cr
  witheach
    [ false swap
      witheach
        [ dup 20 = iff
            [ drop not conclude ] 
          else 
            [ echo sp ] ] 
      iff conclude
      else cr ]