Run results for: HelloDDDDAA

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.4

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Using the spread operator	213252.5 Ops/sec
Using Object.assign	2402703.5 Ops/sec

Script Preparation code:

    var sharedInfo = {
      chromecastVersion: 'cafReceiver',
      activeTrackIds: [],
      tracks: [],
      mediaInfo: null,
      errors: [],
      availabilityStartTime: undefined,
      accessToken: null,
      authorizationKey: null,
      entitlementToken: null,
      senderDeviceId: null,
      initialAudioTrackLanguage: '',
      initialTextTrackLanguage: '',
      viewableId: null,
      playableId: null,
      isLive: false,
      isStarted: false,
      isPlaying: false,
      isSeeking: false,
      isBuffering: false,
      isPlayingDaiAds: false,
      currentTime: 0,
      volume: 0,
      duration: 0,
      playSession: null,
      viewable: {},
      preflight: {
        playlistDuration: 0,
        playlist: null,
        mediaTailor: null,
        license: null,
        headers: null,
      },
      startLivePoint: {},
      sar: '1:1',
    };

var volumeUpdate = {
  volume:1, 
  duration:2,
}

Tests:

Using the spread operator
const finalObject = { ...sharedInfo, ...volumeUpdate };
Using Object.assign
const finalObject = Object.assign(sharedInfo, volumeUpdate);

Run results for: HelloDDDDAA

Using the spread operator

Using Object.assign