⍝ Box the simple text array ⍵:

    a←3 10⍴⎕a                   ⍝ Simple array.
       
    box a                       ⍝ simple case
┌──────────┐
│ABCDEFGHIJ│
│KLMNOPQRST│
│UVWXYZABCD│
└──────────┘

    1 box a                     ⍝ draw a row..
┌──────────┐
│ABCDEFGHIJ│
├──────────┤
│KLMNOPQRST│
│UVWXYZABCD│
└──────────┘

    ⎕io ⎕ml←1 0

    ⍬ (⍳5) box a                ⍝ ..and columns
┌─┬─┬─┬─┬─┬─────┐
│A│B│C│D│E│FGHIJ│
│K│L│M│N│O│PQRST│
│U│V│W│X│Y│ZABCD│
└─┴─┴─┴─┴─┴─────┘

    (1 2) (2+⍳3) box a          ⍝ both
┌───┬─┬─┬─────┐
│ABC│D│E│FGHIJ│
├───┼─┼─┼─────┤
│KLM│N│O│PQRST│
├───┼─┼─┼─────┤
│UVW│X│Y│ZABCD│
└───┴─┴─┴─────┘

    2 ⍬ 1  box a                ⍝ raw case
+----------+
|ABCDEFGHIJ|
|KLMNOPQRST|
+----------+
|UVWXYZABCD|
+----------+

    (¯1) (2+⍳5)        box a    ⍝ no horiz lines
│ABC│D│E│F│G│HIJ│
│KLM│N│O│P│Q│RST│
│UVW│X│Y│Z│A│BCD│

    (¯1 1 3) (2+⍳5)    box a    ⍝ draw bottom
│ABC│D│E│F│G│HIJ│
├───┼─┼─┼─┼─┼───┤
│KLM│N│O│P│Q│RST│
│UVW│X│Y│Z│A│BCD│
└───┴─┴─┴─┴─┴───┘

    (¯1 0 1) (¯1 9 10) box a    ⍝ a variant
─────────┬─┐
ABCDEFGHI│J│
─────────┼─┤
KLMNOPQRS│T│
UVWXYZABC│D│

    (¯1 1 2) (¯1 1 2)  box ↑'OOX' 'OXO' 'XX '   ⍝ I won!
O│O│X
─┼─┼─
O│X│O
─┼─┼─
X│X│ 

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