Re: string immutability
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- Subject: Re: string immutability
- From: Enrico Colombini <erix@...>
- Date: 2014年1月02日 10:28:43 +0100
On 02/01/2014 9.57, Thijs Schreijer wrote:
local first = [[ some 100mb stuff here ]]
> local second = first
> local third = first .. "x"
You have two strings here: 'first' and 'second' are the same string,
'third' is a different string.
Assignment does not duplicate strings. Moreover, because strings are
interned, there is a single copy of strings with equal contents; if you
produce another identical string by different means (e.g. by
concatenation), after the interning operation a single copy of the
string will exist (please correct me if I am wrong here).
".." is a dangerous operator when doing many concatenations or when
operating on large strings.
table.concat and/or the C-level luaL_Buffer can be useful to reduce
memory usage in these cases.
--
Enrico