Which is better?

[Reedych]

Subj

This:

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str = str .. k .. "=" .. v .. ","

or this:

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str = str .. string.format("%s=%s,", k, v)

?

Why minetest lua api doesn't have a class for key-value database (as leveldb) with functions set(), get(), remove()?

[rubenwardy]

Settings() can be used for a file with format the same as minetest.conf
Mod Storage can be used to save arbitrary key-value data

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local storage = minetest.get_mod_storage() -- MUST be called during mod loading!
storage:set_string("a", "b")
storage:get_string("a")