// This trigger fires on newly inserted or reparented Tasks associated with conortunities,
// and stores the conty's current functional role value in the contact   functional role field
trigger updatefunctionalrole1 on Task (before insert, before update) {
// Create a map between the contact ID and its functional role value
Map<ID,String> confunrole1 = new Map<ID,String>();
List<Task> conTasks = new List<Task>();

// Loop through the triggered Tasks and add all of the contact IDs (for those associated with conortunities)
for (Task t : trigger.new) {
    // Only Tasks associated with conortunities
    if (t.whoID!= null && (String.valueOf(t.whoID)).startsWith('003'))  {
        // And only newly inserted Tasks or those being reparented to an contact
        if (trigger.isInsert || (trigger.isUpdate && t.WhoID != trigger.oldMap.get(t.id).WhoID)) {
            confunrole1.put(t.whoID,'');
            conTasks.add(t);
        }
    }
}
// Query the conortunities and add their functional role to the map
for (contact con : [SELECT Functional_Role__c FROM contact WHERE ID IN :confunrole1.keySet()]) {
    confunrole1.put(con.id,con.Functional_Role__c);
}
// Update the contact functional role field on the Task with the relevant value
for (Task t : trigger.new) {
    t.functional_role__c = confunrole1.get(t.whoID);
}
}