Names

The following rules apply to user-assigned symbols, i.e. the names of variables, functions, operators, classes and labels in APLX.

The first character of the name must be one of the alphabetic characters A-Z or a-z, or one of the characters ∆ or ⍙. Subsequent characters can also include digits 0-9, underbar _ and high minus ¯.

Names consist of up to 30 characters (longer names will be truncated).

The following are all valid names in APLX:

DATA X X1 FIRST_VALUE ∆ ∆L1 ErrorCode model mode¯restart a999 Item∆1

Case is significant in names, so DATA Data and data are three distinct names.

There are no reserved names in APL. System-assigned names are distinct from user-assigned names because they start with a Quad ⎕ symbol.