如何找到具有特定ID的JSON值？

Question

I have an object and I'm trying to find a specific value using an ID in ECMAScript6.

I've tried something like this: myvalue = this.json.find(x => x == '1234');

The JSON looks something like this:

{
  "results": [
    {
      "abcde1234": {
        "value": 4
      }
    },
    {
      "zxcv4567": {
        "value": 2
      }
    }
  ]
}

All the examples I've found can only find off named key-value pairs.

Answer 1

 const json = { '1234': { 'value' : 4}, '5678': { 'value' : 10} }; const value = json['1234']; console.log(value); 

The JSON data doesn't seem proper. But in case you are finding by key, you can directly access this, something like:

Answer 2

Parsed JSON maps directly to JavaScript types: Object, Array, boolean, string, number, null. Your example used find() which is (normally) a method used with arrays. If your JSON was structured like this, you could expect to use find:

const jsonString = '["a", "b", "c"]';
const jsonData = JSON.parse(jsonString);
jsonData.find(x => x === "a"); // "a"

But it seems like your data is structured as an object, so you can use normal property access:

const jsonString = '{"1234": {"value": 4}, "5678": {"value": 10}}';
const jsonData = JSON.parse(jsonString);

jsonData["1234"]       // {value: 4}
jsonData["1234"].value // 4

EDIT

OP changed the data example, so the above code is less directly applicable, but the general point is: once you parse it, it's just javascript .

Answer 3

Try

json.results.find(x => /1234/.test(Object.keys(x)[0]));

 json = { "results": [ { "abcde1234": { "value": 4 } }, { "zxcv4567": { "value": 2 } } ] } let r = json.results.find(x => /1234/.test(Object.keys(x)[0])); console.log(r);