/**
* Remove the variable of quest from the list of variables for the quest.<br>
* <br>
* <U><I>Concept : </I></U> Remove the variable of quest represented by "var" from the class
* variable FastMap "vars" and from the database.
*
* @param var : String designating the variable for the quest to be deleted
* @return String pointing out the previous value associated with the variable "var"
*/
public String unset(String var) {
if (var == null) {
return null;
}
String old = _vars.remove(var);
if (old != null) {
Quest.deleteQuestVarInDb(this, var);
}
return old;
}
