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Same [  ]  _ _ _ Left, Right

The monads [ and ] are each identity functions; each yields its argument.
 
  x [ y (left bracket) yields the left argument x , and x ] y (right bracket) yields the right argument y .
 

For example:
   n=: i. 2 3
   a=: 'abcde'

   ]n
0 1 2
3 4 5
                
   [a
abcde
           
   n[a
0 1 2
3 4 5
         
   n]a
abcde
          
   ([\ ; ]\ ; [\. ; ]\.) 'ABCDEF'
+------+------+------+------+
|A     |A     |ABCDEF|ABCDEF|
|AB    |AB    |BCDEF |BCDEF |
|ABC   |ABC   |CDEF  |CDEF  |
|ABCD  |ABCD  |DEF   |DEF   |
|ABCDE |ABCDE |EF    |EF    |
|ABCDEF|ABCDEF|F     |F     |
+------+------+------+------+


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