Merging tables together to add keys that don't exist

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#1

I am wondering how I could have two tables, e.g.

local t1 = {Apples=1,Oranges=2}
and
local t2 = {Apples=1,Lemons=3}, and combine the missing keys into one table that looks like local t3 = {Apples=1,Oranges=2,Lemons=3}.

Is there any way to do this in Lua?
Thanks in advance :}

#2

Use for loops like so:

local function copy(self, t)
    for key, value in pairs(t) do
        self[key] = value
    end
end
#3

The way to do this usually follows the same principle in any language. You just loop through each table, adding a key to a new table if it doesn’t already exist. Now you have a table that contains all k, v pairs.

first time writing Lua code like this in a couple years

local function merge (...)
    local newTable = {}
    for _, t in pairs({...}) do
        for k, v in pairs (t) do
            if newTable[k] == nil then
                newTable[k] = v
            end
        end
    end
  return newTable
end
    
local t1 = {Apples=1,Oranges=2}
local t2 = {Apples=1,Lemons=3}

local merged = merge(t1, t2)
for k, v in pairs(merged) do 
    print(k, v)
end
#4

Thanks! This worked really well. I wouldn’t figure that out otherwise!