json - How to filter array of objects by element property values using jq?

Question

I like to filter json files using jq:

jq . some.json

Given the json containing an array of objects:

{
  "theList": [
    {
      "id": 1,
      "name": "Horst"
    },
    {
      "id": 2,
      "name": "Fritz"
    },
    {
      "id": 3,
      "name": "Walter"
    },
    {
      "id": 4,
      "name": "Gerhart"
    },
    {
      "id": 5,
      "name": "Harmut"
    }
  ]
}

I want to filter that list to only show the elements with id having the value 2 and 4, so the expected output is:

{
  "id": 2,
  "name": "Fritz"
},
{
  "id": 4,
  "name": "Gerhart"
}

How do I filter the json using jq? I have played around with select and map, yet didn't got any of those to work, e.g.:

$ jq '.theList[] | select(.id == 2) or select(.id == 4)' array.json
true

Answer 1

From the docs:

jq '.[] | select(.id == "second")' 

Input [{"id": "first", "val": 1}, {"id": "second", "val": 2}]

Output {"id": "second", "val": 2}

I think you can do something like this:

jq '.theList[] | select(.id == 2 or .id == 4)' array.json