SASSIE

.setValue

This operator sets the answer option for the specified question.  Answer options can be set in several ways; for example:

.setValue(Q(30), 1)       // set the answer for QID 30 to option 1
.setValue(Q(40),  [1, 3]) // set answer for QID 40 to options 1 and 3 (multicheck)
.setValue(Q(50), Q60))    // set answer for QID 50 to whatever the answer is for QID 60
.setValue(Q(70), "Pink")  // set answer for QID 70 to "Pink" (text)
.setValue(Q(80), "")      // clear the answer to QID 80 ("unset" the answer if there is one)

.clearAnswer

.clearAnswer(Q(n)) is, essentially, a wrapper for setValue('') on any given question. It's a little cleaner to use and a bit more intuitive for questions that aren't text-based. Under the hood, it's doing all the same stuff as setValue('').

ifQ(1)
.answered()
.clearAnswer(Q(11))

ifQ(1)
.answered()
.clearAnswer(Q(11), Q(21))

ifQ(1)
.answered()
.clearAnswer(QRange(100,400))

ifQ(1)
.answered()
.clearAnswer(Section(11))