Leave the current DO, FOR, SUB, or FUNCTION immediately.
EXIT DO EXIT FOR EXIT SUB EXIT FUNCTION
Example:
FOR I = 1 TO 10
IF I = 3 THEN EXIT FOR
PRINT I
NEXT I
DO
IF INKEY$() <> "" THEN EXIT DO
LOOP
SUB Demo
IF X < 0 THEN EXIT SUB
PRINT X
END SUB
FUNCTION Half(N)
IF N <= 0 THEN EXIT FUNCTION
Half = N / 2
END FUNCTION
Source: docs/help/exit.txt inmmcore. On the computer, typeHELP EXIT.