one return per method

meh.as

// a difference is not a difference unless it *makes* a difference

public function add(item:*):Boolean
{
    if (contains(item))
        return false;
    
    push(item);
    return true;
}

public function add(item:*):Boolean
{
    var notContained:Boolean = !contains(item);
    if (notContained)
        push(item);
    
    return notContained;
}

I'm with squeedee. Guard clauses rule; conditional slaloms drool.