Run results for: deep clone

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36 OPR/51.0.2830.55

Browser: Opera 51

Operating system: Mac OS X 10.11.0

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
JSON parse	557430.3 Ops/sec
_.deepClone	593066.3 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>
<script src="https://cdn.rawgit.com/ivolovikov/fastest-clone/master/index.js"></script>

Script Preparation code:

var source = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:{a:-1,b:1,c:1,d:1,e:1,f:1,g:1}};
//var source = {a:1};
//var CloneFactory = FastClone.factory(source);

function clone(value) {
        var type = typeof value;
        switch (type) {
            case 'object':
                // null and undefined
                if (value == null) {
                    return value;
                }
                var result = void 0;
                if (value instanceof Date) {
                    result = new Date();
                    result.setTime(value.getTime());
                    return result;
                }
                else if (value instanceof RegExp) {
                    result = newRegExp(value);
                    return result;
                }
                result = JSON.parse(JSON.stringify(value));
                fixTypes(value, result);
                return result;
            default:
                return value;
        }
    }
    function fixPropertyValue(original, copy, key) {
        var originalValue = original[key];
        var originalType = typeof originalValue;
        switch (originalType) {
            case 'object':
                if (originalValue instanceof Date) {
                    var newValue = new Date();
                    newValue.setTime(originalValue.getTime());
                    copy[key] = newValue;
                }
                else if (originalValue instanceof RegExp) {
                    copy[key] = newRegExp(originalValue);
                }
                else if (originalValue == null) {
                    copy[key] = originalValue;
                }
                else {
                    fixTypes(originalValue, copy[key]);
                }
                break;
            case 'number':
                if (isNaN(originalValue)) {
                    copy[key] = NaN;
                }
                else if (originalValue == Infinity) {
                    copy[key] = Infinity;
                }
                break;
            default:
                break;
        }
    }
    function fixTypes(original, copy) {
        if (original instanceof Array) {
            for (var index = 0; index < original.length; index++) {
                fixPropertyValue(original, copy, index);
            }
        }
        else {
            var keys = Object.getOwnPropertyNames(original);
            keys.forEach(function (key) {
                fixPropertyValue(original, copy, key);
            });
        }
    }
    function newRegExp(value) {
        var regexpText = String(value);
        var slashIndex = regexpText.lastIndexOf('/');
        return new RegExp(regexpText.slice(1, slashIndex), regexpText.slice(slashIndex + 1));
    }

Tests:

JSON parse
var objects = [{ 'a': 1 }, { 'b': 2, c: 3, d: 4 }, {c:3}, 4, 5, 6 ,'hello']; //var objects = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:{a:-1,b:1,c:1,d:1,e:1,f:1,g:1}}; var deep = JSON.parse(JSON.stringify(objects));
_.deepClone
var objects = [{ 'a': 1 }, { 'b': 2, c: 3, d: 4 }, {c:3}, 4, 5, 6 ,'hello']; //var objects = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:{a:-1,b:1,c:1,d:1,e:1,f:1,g:1}}; var deep = _.cloneDeep(objects);
fast-clone
//var objects = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:{a:-1,b:1,c:1,d:1,e:1,f:1,g:1}}; var objects = [{ 'a': 1 }, { 'b': 2, c: 3, d: 4 }, {c:3}, 4, 5, 6 ,'hello']; var deep = clone(objects);

Run results for: deep clone

Compare the new ES6 spread operator with the traditional concat() method

JSON parse

_.deepClone

fast-clone