Run results for: Deep copy algo vs JSON manipulation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
JSON copy	1294626.1 Ops/sec
Deep copy	793125.4 Ops/sec

Script Preparation code:

function deepCopy(obj) {
    var copy;

    // Handle the 3 simple types, and null or undefined
    if (null == obj || "object" != typeof obj) return obj;

    // Handle Date
    if (obj instanceof Date) {
        copy = new Date();
        copy.setTime(obj.getTime());
        return copy;
    }

    // Handle Array
    if (obj instanceof Array) {
        copy = [];
        for (var i = 0, len = obj.length; i < len; i++) {
            copy[i] = deepCopy(obj[i]);
        }
        return copy;
    }

    // Handle Object
    if (obj instanceof Object) {
        copy = {};
        for (var attr in obj) {
            if (obj.hasOwnProperty(attr)) copy[attr] = deepCopy(obj[attr]);
        }
        return copy;
    }

    throw new Error("Unable to copy obj! Its type isn't supported.");
};

Tests:

JSON copy
const data = {'my object' : [{'object a' : 'object object'},{'object b' : 'object object'}, {'object c' : 'object object', 'objectd': 36}, 5]} a = JSON.parse(JSON.stringify(data));
Deep copy
const data = {'my object' : [{'object a' : 'object object'},{'object b' : 'object object'}, {'object c' : 'object object', 'objectd': 36}, 5]} a = deepCopy(data);

Run results for: Deep copy algo vs JSON manipulation

JSON copy

Deep copy