Build/Utilities/merge.lua

-- Copies [key, values] from src into dest, if they do not exist
function auMergeTable(dest, src)
    auForEachKV(src, function(key, value)
        if (dest[key]) then return end
        dest[key] = value
    end)
    return dest
end

function auCopyTables(...)
    local dest = {}
    local args = table.pack(...)
    for i=1, args.n do
        local tbl = args[i]
        auForEachKV(tbl, function(key, value) dest[key] = value end)
    end
    return dest
end

-- Alternative to auConcatArrays
-- Copies src into dest
function auMergeArray(dest, src)
    auForEach(src, function(value)
        table.insert(dest, value)
    end)
    return dest
end