Run results for: diffenceWith

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36

Browser: Chrome 90

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Native 1	488912.7 Ops/sec
Native 2	1093344.0 Ops/sec

Script Preparation code:

var oldArr = [
  {
    "id": 52
  },
  {
    "id": 76
  },
  {
    "id": 13
  },
  {
    "id": 96
  },
  {
    "id": 27
  },
  {
    "id": 8
  },
  {
    "id": 23
  },
  {
    "id": 63
  },
  {
    "id": 25
  }
]

var newArr = [
{
    "id": 52
  },
  {
    "id": 76
  },
  {
    "id": 13
  },
  {
    "id": 96
  },
  {
    "id": 27
  },
  {
    "id": 8
  },
  {
    "id": 23
  },
  {
    "id": 63
  },
  {
    "id": 25
  },
  {
    "id": 1
  },
]

Tests:

Native 1
newArr.reduce((ids, {id}) => { return ids.concat( !oldArr.some(oldItem => oldItem.id === id) ? id : [] ); }, [])
Native 2
newArr.filter(({ id }) => !oldArr.some(o => o.id === id))

Run results for: diffenceWith

Native 1

Native 2