12 stopif()

The stopif() function halts an execution if a condition is met.

stopif(2 < 3)

## Error in stopif(2 < 3): Stop condition met.

stopif(2 < 3, 'This is a custom message! STOP!')

## Error in stopif(2 < 3, "This is a custom message! STOP!"): This is a custom message! STOP!