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table.copy: Add example

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Lars Müller 2022-02-20 20:48:20 +01:00
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doc/environment.adoc
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@ -111,6 +111,15 @@ Deepcopies the table `t` and all it's subtables - both keys and values. Non-tabl
The `seen` table is a lookup for already copied tables, which are used as keys. The value is the copy. By providing `[table] = table` entries for certain tables, you can prevent them from being copied.
Example: Preservation of referential structure means the ``assert``ion in the following code will work:
[source,lua]
----
a = {}; b = {a, a}; c = table.copy(b); assert(c[1] == c[2])
----
A different deep cloning implementation might clone `a` twice, leading to `c[1] ~= c[2]`.
==== `table.insert_all(t, other)`
Adds all the list entries of `other` to `t` (list part concatenation).