Since:
DzInteractiveInstructionObject : appendInstruction()
Return Value:
Return Value:
Number : currentIndex()
Return Value:
DzInteractiveInstructionObject : insertInstruction( Number index )
Return Value:
index
position.DzInteractiveInstructionObject : instructionAt( Number index )
Return Value:
index
in the interactive lesson.DzInteractiveInstructionObject : nextInstruction()
Return Value: