有没有办法让我使用正则表达式向后搜索JSON数组？

Question

So I have a string set up like this. That is a JSON string, storing data in this format:

{
    "players": {
        <playerID>: {
            "presets": [{
                "title": <title>,
                "presetId": <id>,
                "preset": {<presetData>},
                "votes": <voteCount>,
                "date": <creationDate>
            }]
        }
}

I want to be able to input a presetId, and get a playerId as the output (basically find out which player has the preset with that id). The same thing can be achieved by looping through each player, and each player's presets, and see if that preset has the correct id, but I need to be doing this a lot, and I feel that that would be quite costly. Would regex be better? What kind of expression would I use?

Answer 1

Regex? No. Stop right there.

What you could do is to flatten the data first, or serve it flat in the first place.

[{
 playerId: ...,
 ...
 presetId: ...,
},{
 playerId: ...,
 ...
 presetId: ...,
}]

Assuming preset ID is unique, you can easily use array.filter or array.find.

var players = flatData.filter(player => player.presetID === ID_TO_FIND);

// or

var player = flatData.find(player => player.presetID === ID_TO_FIND);