Benchmark: angular.copy vs JSON.parse(JSON.stringify()) vs structuredClone AP2

angular.copy vs JSON.parse(JSON.stringify()) vs structuredClone AP2 (version: 0)

FIguring out the performance differences between using the operations in the name on copying an array of objects considering the fact that other methods of copying (slice, concat, etc.) are shallow copies and end up being by reference instead of by value.

Comparing performance of: Object.assign(origArr) vs structuredClone(origArr)

Created: one year ago by: Guest

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HTML Preparation code:

<html>
  <head>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
  </head>
  <body>
  </body>
</html>

Script Preparation code:

var origArr = [
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13937,
        startTime: '2023-11-03T00:00:00-04:00',
        endTime: '2023-11-03T00:30:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: '163_FACILITY',
        isTelehealth: false,
        event: {
          name: 'AP Meeting/Admin',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 463400200,
          firstName: 'Sumit',
          middleName: '',
          lastName: 'kale',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T04:00:00.000Z',
      end: '2023-11-03T04:30:00.000Z',
      resourceId: 55,
      slotIndex: 314,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 53,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T00:30:00',
        endTime: '2023-11-03T01:30:00',
        duration: 60,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T04:30:00.000Z',
      end: '2023-11-03T05:30:00.000Z',
      resourceId: 55,
      slotIndex: 339,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 47,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T00:45:00',
        endTime: '2023-11-03T01:45:00',
        duration: 60,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T04:45:00.000Z',
      end: '2023-11-03T05:45:00.000Z',
      resourceId: 55,
      slotIndex: 338,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13932,
        startTime: '2023-11-03T02:00:00-04:00',
        endTime: '2023-11-03T03:00:00-04:00',
        duration: 60,
        status: 'PENDING',
        location: '163_FACILITY',
        isTelehealth: false,
        event: {
          name: 'AP Alt Patient Event',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T06:00:00.000Z',
      end: '2023-11-03T07:00:00.000Z',
      resourceId: 55,
      slotIndex: 315,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13933,
        startTime: '2023-11-03T04:00:00-04:00',
        endTime: '2023-11-03T05:00:00-04:00',
        duration: 60,
        status: 'PENDING',
        location: '163_FACILITY',
        isTelehealth: false,
        event: {
          name: 'AP Meeting/Admin',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T08:00:00.000Z',
      end: '2023-11-03T09:00:00.000Z',
      resourceId: 55,
      slotIndex: 316,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 48,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T05:45:00',
        endTime: '2023-11-03T06:15:00',
        duration: 30,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T09:45:00.000Z',
      end: '2023-11-03T10:15:00.000Z',
      resourceId: 55,
      slotIndex: 335,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13941,
        startTime: '2023-11-03T06:15:00-04:00',
        endTime: '2023-11-03T06:40:00-04:00',
        duration: 25,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Alt Patient Event',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078000200,
          firstName: 'JMD Rocks',
          middleName: 'JMD Rocks',
          lastName: 'JMD Rocks',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T10:15:00.000Z',
      end: '2023-11-03T10:40:00.000Z',
      resourceId: 55,
      slotIndex: 317,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 59,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T06:40:00',
        endTime: '2023-11-03T07:00:00',
        duration: 20,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T10:40:00.000Z',
      end: '2023-11-03T11:00:00.000Z',
      resourceId: 55,
      slotIndex: 331,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13934,
        startTime: '2023-11-03T07:00:00-04:00',
        endTime: '2023-11-03T08:00:00-04:00',
        duration: 60,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 463400200,
          firstName: 'Sumit',
          middleName: '',
          lastName: 'kale',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T11:00:00.000Z',
      end: '2023-11-03T12:00:00.000Z',
      resourceId: 55,
      slotIndex: 318,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13947,
        startTime: '2023-11-03T08:00:00-04:00',
        endTime: '2023-11-03T08:20:00-04:00',
        duration: 20,
        status: 'PENDING',
        location: 'Greater Victoria Hospital',
        isTelehealth: false,
        event: {
          name: 'AP Alt Patient Event',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 1078000200,
          firstName: 'JMD Rocks',
          middleName: 'JMD Rocks',
          lastName: 'JMD Rocks',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T12:00:00.000Z',
      end: '2023-11-03T12:20:00.000Z',
      resourceId: 55,
      slotIndex: 319,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 65,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T08:20:00',
        endTime: '2023-11-03T09:00:00',
        duration: 40,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T12:20:00.000Z',
      end: '2023-11-03T13:00:00.000Z',
      resourceId: 55,
      slotIndex: 337,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 68,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T09:05:00',
        endTime: '2023-11-03T09:15:00',
        duration: 10,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T13:05:00.000Z',
      end: '2023-11-03T13:15:00.000Z',
      resourceId: 55,
      slotIndex: 328,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 69,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T09:25:00',
        endTime: '2023-11-03T09:50:00',
        duration: 25,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T13:25:00.000Z',
      end: '2023-11-03T13:50:00.000Z',
      resourceId: 55,
      slotIndex: 333,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13935,
        startTime: '2023-11-03T10:15:00-04:00',
        endTime: '2023-11-03T11:15:00-04:00',
        duration: 60,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Alt Patient Event',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T14:15:00.000Z',
      end: '2023-11-03T15:15:00.000Z',
      resourceId: 55,
      slotIndex: 320,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 73,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T11:15:00',
        endTime: '2023-11-03T11:25:00',
        duration: 10,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T15:15:00.000Z',
      end: '2023-11-03T15:25:00.000Z',
      resourceId: 55,
      slotIndex: 329,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 74,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T11:30:00',
        endTime: '2023-11-03T11:50:00',
        duration: 20,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T15:30:00.000Z',
      end: '2023-11-03T15:50:00.000Z',
      resourceId: 55,
      slotIndex: 332,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        freezeNotes: 's',
        freezeReason: 'YN Freeze Reason',
        resourceId: 55,
        startTime: '2023-11-03T11:55:00',
        endTime: '2023-11-03T12:00:00',
        duration: 5,
        sourceType: 'AdHocFreeze',
        category: {
          type: 'AdHocFreeze',
          value: 'Unavailable',
        },
      },
      start: '2023-11-03T15:55:00.000Z',
      end: '2023-11-03T16:00:00.000Z',
      resourceId: 55,
      slotIndex: 341,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 75,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T12:00:00',
        endTime: '2023-11-03T12:25:00',
        duration: 25,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T16:00:00.000Z',
      end: '2023-11-03T16:25:00.000Z',
      resourceId: 55,
      slotIndex: 334,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 76,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T12:30:00',
        endTime: '2023-11-03T12:40:00',
        duration: 10,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T16:30:00.000Z',
      end: '2023-11-03T16:40:00.000Z',
      resourceId: 55,
      slotIndex: 330,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13936,
        startTime: '2023-11-03T12:40:00-04:00',
        endTime: '2023-11-03T13:40:00-04:00',
        duration: 60,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Meeting/Admin',
          categoryType: 'Meeting/Admin',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 2,
            resourceName: 'Ansari1, Aftab',
            resourceType: 'P',
            isAnchorResource: false,
          },
        ],
        patient: {
          patientGuid: 1078200200,
          firstName: 'JMD Rocks Def',
          middleName: 'JMD Rocks Def',
          lastName: 'JMD Rocks Def',
        },
        category: {
          type: 'event',
          value: 'Meeting/Admin',
        },
      },
      start: '2023-11-03T16:40:00.000Z',
      end: '2023-11-03T17:40:00.000Z',
      resourceId: 55,
      slotIndex: 321,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13950,
        startTime: '2023-11-03T14:00:00-04:00',
        endTime: '2023-11-03T14:30:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T18:00:00.000Z',
      end: '2023-11-03T18:30:00.000Z',
      resourceId: 55,
      slotIndex: 322,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13962,
        startTime: '2023-11-03T14:40:00-04:00',
        endTime: '2023-11-03T15:05:00-04:00',
        duration: 25,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T18:40:00.000Z',
      end: '2023-11-03T19:05:00.000Z',
      resourceId: 55,
      slotIndex: 323,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13951,
        startTime: '2023-11-03T15:05:00-04:00',
        endTime: '2023-11-03T15:35:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T19:05:00.000Z',
      end: '2023-11-03T19:35:00.000Z',
      resourceId: 55,
      slotIndex: 324,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13956,
        startTime: '2023-11-03T15:20:00-04:00',
        endTime: '2023-11-03T15:50:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T19:20:00.000Z',
      end: '2023-11-03T19:50:00.000Z',
      resourceId: 55,
      slotIndex: 325,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13953,
        startTime: '2023-11-03T16:05:00-04:00',
        endTime: '2023-11-03T16:35:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T20:05:00.000Z',
      end: '2023-11-03T20:35:00.000Z',
      resourceId: 55,
      slotIndex: 326,
    },
    {
      source: 'calendar-view',
      appointment: {
        appointmentId: 13957,
        startTime: '2023-11-03T16:05:00-04:00',
        endTime: '2023-11-03T16:35:00-04:00',
        duration: 30,
        status: 'PENDING',
        location: 'GVH-EastWing 1A',
        isTelehealth: false,
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        notes: '',
        complaint: '',
        resources: [
          {
            resourceId: 18,
            resourceName: 'Jadhav, Vikas V',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          patientGuid: 1078100200,
          firstName: 'JMD Rocks PE',
          middleName: 'JMD Rocks PE',
          lastName: 'JMD Rocks PE',
        },
        category: {
          type: 'event',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T20:05:00.000Z',
      end: '2023-11-03T20:35:00.000Z',
      resourceId: 55,
      slotIndex: 327,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: null,
        timeSlotId: 41,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: {
          firstName: 'AP Reserved Time',
          middleName: 'AP Reserved Time',
          lastName: 'AP Reserved Time',
          birthYear: 0,
          birthMonth: 0,
          birthDay: 0,
          birthTime: '',
          gender: '',
          isEstimatedDob: false,
        },
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T16:45:00',
        endTime: '2023-11-03T17:15:00',
        duration: 30,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T20:45:00.000Z',
      end: '2023-11-03T21:15:00.000Z',
      resourceId: 55,
      slotIndex: 336,
    },
    {
      source: 'calendar-view',
      allocatedTimeSlot: {
        event: {
          name: 'AP Patient Event',
          categoryType: 'Patient Event',
        },
        timeSlotId: 42,
        location: {
          locationName: 'GVH-EastWing 1A',
          locationGuid: 76600610,
        },
        resources: [
          {
            resourceId: 1,
            resourceName: 'Ongmore, John',
            resourceType: 'P',
            isAnchorResource: false,
          },
          {
            resourceId: 55,
            resourceName: 'Patel, Arpan',
            resourceType: 'P',
            isAnchorResource: true,
          },
        ],
        patient: null,
        additionalInformation: '',
        resourceId: 55,
        startTime: '2023-11-03T17:40:00',
        endTime: '2023-11-03T22:40:00',
        duration: 300,
        sourceType: 'ReserveTime',
        category: {
          type: 'ReserveTime',
          value: 'Patient Event',
        },
      },
      start: '2023-11-03T21:40:00.000Z',
      end: '2023-11-04T02:40:00.000Z',
      resourceId: 55,
      slotIndex: 340,
    },
  ];

var newArr = [];

Tests:

Object.assign(origArr)
newArr = Object.assign(origArr);
structuredClone(origArr)
newArr = structuredClone(origArr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign(origArr)
structuredClone(origArr)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36

Browser/OS: Chrome 118 on Windows

View result in a separate tab

Test name	Executions per second
Object.assign(origArr)	4066460.2 Ops/sec
structuredClone(origArr)	2869.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

It seems like you're asking me to analyze and compare the performance of two JavaScript methods, `Object.assign()` and `structuredClone()`, when used for object cloning. You've provided examples of:

1. The original code (JSON data) and individual test cases in JavaScript.
2. The latest benchmark results comparing the two methods.

To answer your question:

**What's the difference between `Object.assign()` and `structuredClone()?`**

*   `Object.assign()` is a method that creates a new object by copying all enumerable own properties from one or more source objects into a target object. It's useful for shallow cloning, but it can be slow for deep cloning and might not preserve property names.
*   `structuredClone()` is a relatively new method introduced in ECMAScript 2020 that provides a way to create a deep clone of an object, preserving all its properties, including their names.

**Which method is faster?**

Based on the benchmark results you provided:

| Method | Executions Per Second |
| --- | --- |
| `Object.assign()` | ~4.06M (Chrome 118) |
| `structuredClone()` | ~2.87M (Chrome 118) |

While both methods are fast, `Object.assign()` seems to be slightly faster than `structuredClone()`. However, keep in mind that the performance difference is relatively small, and the choice between these two methods depends on your specific use case:

*   Use `Object.assign()` for shallow cloning or when performance is critical.
*   Use `structuredClone()` for deep cloning or when preserving property names is essential.

Here's an example of how to implement these methods in your code:
```javascript
// Shallow cloning using Object.assign()
const clonedObj = { a: 1, b: 2 };
const shallowClonedObj = Object.assign({}, clonedObj);
console.log(shallowClonedObj); // Output: { a: 1, b: 2 }

// Deep cloning using structuredClone()
import { structuredClone } from 'structured-cloners'; // Install via npm or yarn

const clonedObj = { a: 1, b: 2, c: { d: 3 } };
const deepClonedObj = structuredClone(clonedObj);
console.log(deepClonedObj); // Output: { a: 1, b: 2, c: { d: 3 } }
```

Related benchmarks: