The symbol chosen to represent Disclose depends on the current Migration Level.
If ⎕ML<2, Disclose is represented by the symbol: ⊃.
If ⎕ML≥2, Disclose is represented by the symbol: ↑.
Y may be any array. R is an array. If Y is non-empty, R is the value of the first item of Y taken in ravel order. If Y is empty, R is the prototype of Y.
Disclose is the inverse of Enclose. The identity R←→⊃⊂R holds for all R. Disclose is also referred to as First.
⊃1 1 ⊃2 4 6 2 ⊃'MONDAY' 'TUESDAY' MONDAY ⊃(1 (2 3))(4 (5 6)) 1 2 3 ⊃⍳0 0 ' '=⊃'' 1 ⊃1↓⊂1,⊂2 3 0 0 0