Run results for: HelloDDDDAA

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36

Browser: Chrome 88

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Using the spread operator	3196177.2 Ops/sec
Using Object.assign	2259213.8 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