How to delete array element from JSON array of objects by ID-CodePudding

This is probably quite easy, but giving me trouble. Given this JSON structure:

 "playlists" : [
      {
        "id" : "1",
        "owner_id" : "2",
        "song_ids" : [
          "8",
          "32"
        ]
      },
      {
        "id" : "2",
        "owner_id" : "3",
        "song_ids" : [
          "6",
          "8",
          "11"
        ]
      },
      {
        "id" : "3",
        "owner_id" : "7",
        "song_ids" : [
          "7",
          "12",
          "13",
          "16",
          "2"
        ]
      }
    ]

How would you delete an object from the array by key/value? In this case by ID? playlist.splice(1,1)? playlist.delete(id)? Not sure how to do this elegantly. Let's say I wish to delete the element with ID = 3, how to get this result:

 "playlists" : [
      {
        "id" : "1",
        "owner_id" : "2",
        "song_ids" : [
          "8",
          "32"
        ]
      },
      {
        "id" : "2",
        "owner_id" : "3",
        "song_ids" : [
          "6",
          "8",
          "11"
        ]
      }
]

CodePudding user response：

Using Array.filter, you can filter out elements that don't match a certain condition. For example:

const result = playlists.filter(playlist => playlist.id !== '2');

Here's a working demo:

/* Example Data */
const playlists = [
  {
    "id" : "1",
    "owner_id" : "2",
    "song_ids" : [ "8", "32"]
  },
  {
    "id" : "2",
    "owner_id" : "3",
    "song_ids" : ["6", "8","11" ]
  }
];

/* Takes a list of playlists, and an ID to remove */
const removePlaylistById = (plists, id) =>
  plists.filter(playlist => playlist.id !== id);

/* Removes playlist ID 2 from list, prints result */
const result = removePlaylistById(playlists, '2');
console.log(result);

Another option, would be to use Array.findIndex to get the index of an element with given ID, then use Array.splice to remove that element. This will modify the array, without the need for a copy.

For example:

const indexToRemove = playlists.findIndex((pl) => pl.id === '2');
playlists.splice(indexToRemove, 1);