Are double for loops bad?

[XxLMM13xXx]

so heres the code in question

        for tqid, tqv in pairs(Config.TestQuestions) do
            for aid, av in pairs(answers) do
                if tqv.question == av.question and tqv.correct != av.answer then
                    failed = true
                end
            end
        end

As you can see i have a for loop running inside another for loop (i know it sounds bad already) but im not sure theres another way to do what im trying to do...

I have a table in my config

    config.TestQuestions = { -- The questions
        {
            question = "Test question 1",
            options = {"test answer 1", "test answer 2", "test answer 3", "test answer 4"},
            correct = "test answer 2"
        },
        {
            question = "Test question 2",
            options = {"test answer 1", "test answer 2", "test answer 3", "test answer 4"},
            correct = "test answer 2"
        },
        {
            question = "Test question 3",
            options = {"test answer 1", "test answer 2", "test answer 3", "test answer 4"},
            correct = "test answer 2"
        },
    }

Now this table is only seen serverside NOT clientside because then the client could see the correct answer... So send a modified table to the client with only the questions and the options... Then when they are done with the questions i create a table clientside to send to the serverside with the question and the answer they gave

        QuestionOptions.OnSelect = function( panel, index, value )
            for paid, pa in pairs(plysanswer) do
                if pa.question == v.question then
                    pa.answer = value
                end
            end
        end
-- yes i know i have for paid and pa however im using this for loop inside of a greater for loop that uses k, v (for the questions on my derma)

So now when this is all sent to the server side i have that code at the top (first code block)

Now my idea is that if i loop through the servers config questions and then i loop through the answers given and compare them i can see if they match however the double for statement does not look right.. I tried using the whole table.HasValue however it seems like that would not make sense in this case...

Thanks for reading any help would be great!

[G😹nz😻]

Sometimes you will require it, it doesn't mean it's something bad

[MrRalgoman]

i don't find myself using it often in glua, but w/e dealing with json data you will almost always find yourself looping through loops.

[XxLMM13xXx]

Thanks guys for the answer! Seems like the overall answer is it is alright to have a loop inside of a loop! Ill leave this open in case anyone wants to add!

[c👌de_g🎷]

If you are able to do something without a second loop aka increasing the big O efficiency, do it, but some things are going to require doubly or triply-nested for loops.