Sparse array in Lua?

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1

Not an SDK question, a Lua syntax one.

I need a sparse array, however, when I use a table the count (#foo) is only counting the non-sparse sub-array from 1.

local foo = {}
printTable(foo)
print("count:", #foo)
table.insert(foo, 1, "One")
foo[2] = "Two"
printTable(foo)
print("count:", #foo)
foo[3] = "Three"
printTable(foo)
print("count:", #foo)
foo[5] = "Five"
printTable(foo)
print("count:", #foo)
foo[4] = nil
printTable(foo)
print("count:", #foo)

Output:

{
}
count:	0
{
	One,
	Two,
}
count:	2
{
	One,
	Two,
	Three,
}
count:	3
{
	One,
	Two,
	Three,
	Five,
}
count:	3
{
	One,
	Two,
	Three,
	Five,
}
count:	3

How can I implement a sparse array that I can add to at arbitrary indexes?

2

OK. Just figured it out. You can iterate through all the elements with pairs (nil is not returned)

for index, value in pairs(foo) do
    print("i:", index, "v", value)
end

i:  1   v   One
i:  2   v   Two
i:  3   v   Three
i:  5   v   Five
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