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Add FAQ about table iteration order.

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Mike Pall 2021-04-25 17:44:03 +02:00
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doc/faq.html
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@ -131,6 +131,19 @@ You have to press Ctrl-C twice to get stop your program. That's similar
to when it's stuck running inside a C function under the Lua interpreter.</dd>
</dl>
<dl id="order">
<dt>Q: Table iteration with <tt>pairs()</tt> does not result in the same order?</dt>
<dd>The order of table iteration is explicitly <b>undefined</b> by
the Lua language standard.<br>
Different Lua implementations or versions may use different orders for
otherwise identical tables. Different ways of constructing a table may
result in different orders, too.<br>
Due to improved VM security, LuaJIT 2.1 may even use a different order
on separate VM invocations or when string keys are newly interned.<br><br>
If your program relies on a deterministic order, it has a bug. Rewrite it,
so it doesn't rely on the key order. Or sort the table keys, if you must.
</dl>
<dl id="sandbox">
<dt>Q: Can Lua code be safely sandboxed?</dt>
<dd>