On 13 Jan 2011, at 19:07, Evgeniy Khramtsov wrote: > ++ operator is slow. It is better to use dialyzer in order to track such errors. Efficiency Guide, Chapter 2.4 - Myth: '++' is always bad http://erlang.org/doc/efficiency_guide/myths.html#id54761 BR, Ulf W Ulf Wiger, CTO, Erlang Solutions, Ltd. http://erlang-solutions.com