Run results for: test 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
spread	1940051.6 Ops/sec
shallow copy	3460285.5 Ops/sec

Script Preparation code:

var route = {
    "appConfigId": "8f7cd9d8534d0d10a86bddeeff7b12bc",
    "experienceId": "bb508d10530d0d10a86bddeeff7b12e9",
    "experienceName": "ACE App Builder",
    "pageProperties": {
        "chrome_header": "{\"privatePage\":{\"notificationsEnabled\":true,\"searchEnabled\":false,\"userPrefsEnabled\":true,\"contextualConfigurationItems\":{\"enabled\":false},\"globalTools\":{\"collapsingMenuId\":0,\"primaryItems\":[{\"label\":\"UserMenu\",\"icon\":\"user\",\"type\":\"menu\",\"primaryDisplay\":\"icon\",\"value\":{\"children\":[{\"label\":\"Logout\",\"position\":500,\"type\":\"navigation\",\"value\":{\"value\":{\"href\":\"/logout.do\"},\"type\":\"external\"}}]}}]}},\"publicPage\":{\"actionButtons\":[],\"notificationsEnabled\":false,\"searchEnabled\":false,\"userPrefsEnabled\":false,\"menuEnabled\":false}}",
        "ace_application_id": "1a418990530d0d10a86bddeeff7b1200",
        "chrome_footer": "{\"public_page\":{\"enable_footer_topbar\":false,\"footer_topbar_options\":{},\"enable_footer_bar\":false,\"footer_bar_options\":{}}}"
    },
    "urlPath": "now/ace-app-builder"
}

function shallowCopy(...objs) {
	const res = Object.create(null);
    for (const obj of objs) {
        for (const key in obj) {
    		res[key] = obj[key];
    	}
    }
	res.hasOwnProperty = (prop) => {
		return prop in res;
	}
	return res;
}

Tests:

spread
var res = { ...route, viewportElementId: 'uxf-viewport-screen', reinitialize: true }
shallow copy
var res = shallowCopy(route, { viewportElementId: 'uxf-viewport-screen', reinitialize: true })

spread

shallow copy