Run results for: FilterMap vs Map v2

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G986U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Mobile Safari/537.36

Browser: Chrome Mobile 89

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Map	182793.2 Ops/sec
FilterMap	183091.3 Ops/sec

Script Preparation code:

var obj = { messages: [
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": false,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
   {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": false,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
   {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": false,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
   {
    "read": true,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  },
  {
    "read": false,
    "message": "testing this message",
    "other_prop": null,
    "type": "customer_message"
  }
] }

Tests:

Map
let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.map(m => { return m.read ? m : Object.assign({}, m, { read: true });});
FilterMap
let newObj = { messages: [] }; newObj.messages = Object.assign([], obj.messages); newObj.messages.filter(m => {return m.read === false}).map(m => { return m.read ? m : Object.assign({}, m, { read: true });});