Lua Table Access Efficiency

Question

I have a question about accessing data in a Lua table.
Let's say there is a large Lua table, for example:

 tbl = {
         {
           blockIdx = 5,
           key1 = "val1",
           key2 = "val2",
           ...
         },
         {
           blockIdx = 30,
           key1 = "val11",
           key2 = "val12",
           ...
         },
         {
           blockIdx = 83,
           key1 = "val21",
           key2 = "val22",
           ...
         },
         ...
       }

And now I want to find one of the blocks, which blockIdx, for example 38.
Therefore, usually I would use forto search for a block:

for k,v in pairs(tbl) do
     if v.blockIdx == 38 then
        blahFunction(v)
     end
end

But I do not think this is a good idea, especially for a large table.
Therefore, I modify the table a little:

 tbl = {
         [5] = { 
           key1 = "val1",
           key2 = "val2",
           ...
         },
         [30] = {
           key1 = "val11",
           key2 = "val12",
           ...
         },
         [83] = {
           key1 = "val21",
           key2 = "val22",
           ...
         },
         ...
       }

Then I can easily access my block with a single line:

blahFunction(tbl[38])

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Answer 1

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