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cheat-sheet articles are about code snippets that I need every once in a while, and which I constantly forget about.

From the WeeChat FAQ:

With smart filter (keep join/part/quit from users who spoke recently):

/set irc.look.smart_filter on
/filter add irc_smart * irc_smart_filter *

With a global filter (hide all join/part/quit):

/filter add joinquit * irc_join,irc_part,irc_quit *

Ignoring the messages only in specific channels can be achieved by providing the full channel names (in a comma-separated list) after the filter name:

/filter add myfilter irc.freenode.#mychannel irc_smart_filter *

Use /filter disable myfilter or /filter del myfilter to disable or delete the filter.