HELP FUNCTION · mmcore

Define a user function that returns a value. Call it in an expression as name(). Assign to the function name to set the result.

FUNCTION name [([arg [AS type] [, …])]] statements name = value EXIT FUNCTION END FUNCTION

Parameters and the function name may use AS typename for a TYPE (see TYPE). The function name is a local of that type; assign members, copy a whole struct into it, or STRUCT COPY src TO name. Callers assign the result:

DIM m AS Message
m = WaitMsg()

For a routine with no return value see SUB.

Example:

FUNCTION RandByte()
  RandByte = INT(RND * 256)
END FUNCTION
PRINT RandByte()

FUNCTION Twice(N)
  Twice = N * 2
END FUNCTION
PRINT Twice(21)

Source: docs/help/function.txt inmmcore. On the computer, typeHELP FUNCTION.