max

>>-max-+------------------+------------------------------------><
       |    +-,------+    |
       |    V        |    |
       +-(----number-+--)-+

Returns the largest number from among the receiver and any arguments. The number that [max] returns is formatted according to the current NUMERIC settings. You can specify any number of [number] s.

String class - max method

12~max(6,7,9)                                                ->    12
17.3~max(19,17.03)                                           ->    19
"-7"~max("-3","-4.3")                                        ->    -3
1~max(2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21)   ->    21