code: @CanIgnoreReturnValue
    public long updateAndGet(K key, LongUnaryOperator updaterFunction) {
      checkNotNull(updaterFunction);
      return map.compute(
          key, (k, value) -> updaterFunction.applyAsLong((value == null) ? 0L : value.longValue()));
    }
docs: Updates the value currently associated with {@code key} with the specified function, and
  returns the new value. If there is not currently a value associated with {@code key}, the
  function is applied to {@code 0L}.
  
  @since 21.0