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local a = { 1, 2, 3, nil, 5, six = 6, seven = 7 };

for i = 1, #a do
    print(a[i]) -- 1, 2, 3, nil, 5
end

for k, v in ipairs(a) do
    print(v) -- 1, 2, 3
end

for k, v in pairs(a) do
    print(v) -- 1, 2, 3, 5, 7, 6
end

local model = {
    status = 'active',

    get = function(self, key) return self[key] end
}

local a = model:get 'status' == 'active' -- true