Re: Why is nil not a valid table key?
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- Subject: Re: Why is nil not a valid table key?
- From: Chris Marrin <chris@...>
- Date: 2005年11月27日 09:52:19 -0800
Rici Lake wrote:
On 26-Nov-05, at 10:29 AM, Mike Pall wrote:
Lua signals the end of a table traversal with a nil key. This is
both simple and efficient.
It is pretty easy to store a 'length' property in a table to identify
how many numeric keys it has. I found that technique ALMOST works in
Lua. If a table has entries for numeric keys 1,2,12 and 17, and I set
the length property to 17 then I can go:
for i=1,t.length do
print(t[i])
end
and I will get all the numbers printing out, with nils in the slots that
don't have a numeric index.
But I found that attempting to set:
t[0] = "hello"
does not work. When I read this back, it prints nil. Is this true, or do
I have a bug in my logic somewhere? I thought Lua only cared about
"arrays starting at 1" when you fill a table like this:
local t = { 12,17,627 }
In which case t[1] == 12. But can you not even set a numeric property on
a table with the numeric key of 0? If so, that seems very broken...
--
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