Benchmark: Large Object cloning

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

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        "DELETE_STUDY_MSG": "/index.php/plugins/unsecure?plugin=SimpleStartUpPlugin&function=deleteStudyMsg",
        "LOAD_WELCOME_MSGS": "/index.php/plugins/unsecure?plugin=SimpleStartUpPlugin&function=loadWelcomeMsgs",
        "LOAD_END_MSGS": "/index.php/plugins/unsecure?plugin=SimpleStartUpPlugin&function=loadEndMsgs",
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        "globalQuota": 100,
        "quotaUnits": "abs",
        "responsesCount": 53,
        "completesCount": 25,
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        "autoSavedSince": 1202535,
        "autoSaveTimeStamp": 1687383952,
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            "webext": true,
            "android": true,
            "ios": true
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        "webExtRequirement": 2,
        "uninstallExt": true,
        "useRedirectUrls": false,
        "urlParameterName": "IDIN",
        "completionUrl": "https://measuringu.com/completion-redirect?uid={p}",
        "quotaUrl": "https://measuringu.com/overall-quota-redirect?uid={p}",
        "terminationUrl": "https://measuringu.com/screenout-redirect?uid={p}",
        "redirectSourceTree": {
            "id": 0,
            "parentId": null,
            "pos": 1,
            "nodeType": "root",
            "name": "All Panels",
            "nodesets": {
                "redirects": {}
            }
        },
        "redirectUrlRules": {
            "URL should include http/https part": {}
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        "redirectSourceParamRules": {
            "Only letters and digits are allowed": {},
            "Length should be between 1-5 characters": {}
        },
        "urlParamRules": {
            "Only letters and numbers are allowed": {}
        },
        "activeEditedMsgs": [],
        "studyQuotaMsg": "<p>Thank you for your interest, but this study has been filled and cannot be taken anymore.</p>",
        "welcomeMessages": [],
        "selWelcomeMsgId": 0,
        "studyWelcomeMsg": "<p>Thank you for participating in this evaluation.</p><p><br></p><p>You will be asked to perform a few tasks on a website. After you have read the task and are ready to proceed, click the “Start Task” button. The task instructions will also be shown in a small window on the bottom of your screen so you can refer to them throughout the task. Once you feel that you have completed the task successfully, click the \"End Task\" button.</p><p><br></p><p>Please remember that this is an evaluation of the website and not you, so do the best you can to complete the tasks. Some tasks may be harder than others. Have a piece of paper and pen ready as you will be asked to write down information during some tasks.</p>",
        "showWelcomeMsg": true,
        "endMessages": [],
        "selEndMsgId": 0,
        "studyEndMsg": "<p>Thank you. Your responses have been submitted. We appreciate your time and effort.</p>",
        "studyStoppedMsg": "<p>Sorry, this study has been paused, and cannot be taken right now.</p>",
        "studyName": "Steve - Scroll Click Test",
        "defaultMsgs": {
            "defaultTaskWelcomeMsg": "<p>Thank you for participating in this evaluation.</p><br/><p>You will be asked to perform a few tasks on a website. After you have read the task and are ready to proceed, click the “Start Task” button. The task instructions will also be shown in a small window on the bottom of your screen so you can refer to them throughout the task. Once you feel that you have completed the task successfully, click the \"End Task\" button.</p><br/><p>Please remember that this is an evaluation of the website and not you, so do the best you can to complete the tasks. Some tasks may be harder than others. Have a piece of paper and pen ready as you will be asked to write down information during some tasks.</p>",
            "defaultCustWelcomeMsg": "<p>Thank you for participating in this evaluation. Let's get started.</p>",
            "defaultEndMsg": "<p>Thank you. Your responses have been submitted. We appreciate your time and effort.</p>",
            "defaultScreenoutMsg": "<p>Thank you for your interest in taking our survey. Based on your response, you do not meet the qualifications for our survey.</p>"
        },
        "ownerInfo": {
            "uid": "4",
            "users_name": "steve",
            "full_name": "Steve Jenks",
            "email": "steve@measuringu.com"
        },
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            "Please wait...": {
                "en": "Please wait..."
            },
            "Done": {
                "en": "Done"
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                "en": "Start task"
            },
            "Proceed": {
                "en": "Proceed"
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            "Re-start Task": {
                "en": "Re-start Task"
            },
            "End Task": {
                "en": "End Task"
            },
            "Confirm Selected Element": {
                "en": "Confirm Selected Element"
            },
            "Change Selection": {
                "en": "Change Selection"
            },
            "Task description": {
                "en": "Task description"
            },
            "Open Chrome Web Store to Install Browser Extension": {
                "en": "Open Chrome Web Store to Install Browser Extension"
            },
            "Open Firefox Add-ons to Install Browser Extension": {
                "en": "Open Firefox Add-ons to Install Browser Extension"
            },
            "Install MeasuringU Android survey tool": {
                "en": "Install MeasuringU Android survey tool"
            },
            "Copy Link and Install Survey App": {
                "en": "Copy Link and Install Survey App"
            },
            "Decline Install and Continue to Survey": {
                "en": "Decline Install and Continue to Survey"
            }
        },
        "extUpperMsg": {
            "en": {
                "desktop": "",
                "mobile": ""
            }
        },
        "extLowerMsg": {
            "en": {
                "desktop": "",
                "mobile": ""
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        },
        "condRandTypes": [{
            "id": 0,
            "markup": "All Conditions"
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            "id": 1,
            "markup": "Just One Condition"
        }, {
            "id": 2,
            "markup": "One Fixed Condition and Another at Random"
        }],
        "allCondTypes": [{
            "id": 1,
            "markup": "In Listed Order"
        }, {
            "id": 3,
            "markup": "In Fully Randomized Order"
        }],
        "oneCondTypes": [{
            "id": 2,
            "markup": "Assigned At Random"
        }, {
            "id": 5,
            "markup": "Assigned Based on Criteria"
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        "oneFixedCondTypes": [{
            "id": 4,
            "markup": "Fixed Condition First"
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        "activeCondRandType": 2,
        "activeCondRandDDItem": 1,
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        "mandatoryCondId": null,
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        }, {
            "id": 2,
            "markup": "Random (All Tasks)"
        }, {
            "id": 3,
            "markup": "Random (Partially)"
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        "comparisonTaskRandTypes": [{
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            "markup": "All Sequentially"
        }, {
            "id": 2,
            "markup": "Random (All Tasks)"
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        "partialRandTasksNum": 0,
        "useGroupRand": false,
        "enableBackwardsNavigation": true,
        "showProgressBar": true,
        "activeStudySavedSettingsState": {}
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        "DUPE_IMGS": "/index.php/plugins/unsecure?plugin=SimpleStartUpPlugin&function=duplicateDraftImages",
        "SAVE_ACTIVE_STUDY_CHANGES": "/index.php/plugins/unsecure?plugin=SimpleStartUpPlugin&function=saveActiveStudyStructChanges",
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        "hasTextTasks": false,
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        "hasConditions": false,
        "hasCards": false,
        "hasLegacyTrees": false,
        "hasTreeTest": false,
        "recordingEnabled": {
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                "videoIsRecorded": false,
                "eventsAreRecorded": false
            },
            "13620": {
                "videoIsRecorded": false,
                "eventsAreRecorded": false
            },
            "13621": {
                "videoIsRecorded": false,
                "eventsAreRecorded": false
            }
        },
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                    "defAnswerIds": []
                },
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            },
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                            "quotaLanguageSettingsId": "268",
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                                    "id": "268",
                                    "qid": "13612",
                                    "quota_id": "268",
                                    "code": "Y"
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                            }
                        },
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            "anyCardsHint": {
                "title": "Sort Any Amount (cards) Hint",
                "label": "Any amount of cards can be sorted",
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            "anyCatsHint": {
                "title": "Use Any Amount (categories) Hint:",
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            "allCatsHint": {
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                "header": "Help, Instructions and Headers",
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                "label": "Please, drop your cards here",
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            "newCategoryOnCardDropInstruction": {
                "title": "New Category On Drop Instruction",
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            "cardListHeader": {
                "title": "Card List Header",
                "label": "Card List",
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                "label": "Information",
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                "title": "Saved Message Notification",
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                "title": "Cannot Add Category Popup",
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                "title": "Cannot Delete Non-Empty Category Popup",
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                "title": "Error Saving Data Popup Title",
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                "title": "Error Saving Data Popup Message",
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                "longText": true
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            "addNewCategoryBtn": {
                "header": "Button Labels",
                "title": "Add New Category Button",
                "label": "Add New Category",
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            "deleteAllCategoriesBtn": {
                "title": "Delete All Categories Button",
                "label": "Delete All Categories",
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            "deleteCategoryBtn": {
                "title": "Delete Category Button",
                "label": "Delete this category",
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                "title": "Reset Button",
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                "label": "Minimum sorted cards not met. Please sort more cards.",
                "longText": true
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            "validateUseMoreCats": {
                "title": "Use More Categories Feedback",
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            "validateCardsOutside": {
                "title": "Cards Sorted Outside of Categories Feedback",
                "label": "One or more cards were placed outside of categories. Please sort them to categories.",
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            "validateEmptyCats": {
                "title": "Empty Categories Feedback",
                "label": "One or more categories are empty. Please add cards to, or remove the empty categories",
                "longText": true
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            "validateEmptyCatName": {
                "title": "Empty Category Name Feedback",
                "label": "One or more categories have an empty name. Please enter a name for all categories.",
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            "categoryPlaceholder": {
                "title": "New Category Label Placeholder",
                "label": "Enter a label",
                "longText": false
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            "emptyCategoryLabel": {
                "title": "Empty Category Label Error Feedback",
                "label": "Label should not be empty",
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        },
        "defaultCardCatLabels": {
            "cardLabel": {
                "title": "Card Label Singular",
                "label": "card"
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            "cardLabelPlural": {
                "title": "Card Label Plural",
                "label": "cards"
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            "catLabel": {
                "title": "Category Label Singular",
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            "catLabelPlural": {
                "title": "Category Label Plural",
                "label": "categories"
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                "singular": "List Option",
                "plural": "List Options"
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            "3": {
                "singular": "List Option",
                "plural": "List Options"
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            "4": {
                "singular": "List Option",
                "plural": "List Options"
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            "5": {
                "singular": "List Option",
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                "singular": "Row",
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            "7": {
                "singular": "Row",
                "plural": "Rows"
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            "8": {
                "singular": "Row",
                "plural": "Rows"
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            "9": {
                "singular": "Row",
                "plural": "Rows"
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            "10": {
                "singular": "Row",
                "plural": "Rows"
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            "11": {
                "singular": "Row",
                "plural": "Rows"
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            "12": {
                "singular": "Row",
                "plural": "Rows"
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            "13": {
                "singular": "Row",
                "plural": "Rows"
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            "14": {
                "singular": "Row",
                "plural": "Rows"
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            "20": {
                "singular": "Row",
                "plural": "Rows"
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            "21": {
                "singular": "Item for ranking",
                "plural": "Items for ranking"
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            "27": {
                "singular": "Row",
                "plural": "Rows"
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            "28": {
                "singular": "Checkbox",
                "plural": "Checkboxes"
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            "29": {
                "singular": "Row",
                "plural": "Rows"
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            "31": {
                "singular": "Row",
                "plural": "Rows"
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            "32": {
                "singular": "Card",
                "plural": "Cards"
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        },
        "dimTwoItemLabels": {
            "6": {
                "singular": "Column",
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            "10": {
                "singular": "Column",
                "plural": "Columns"
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            "11": {
                "singular": "Column",
                "plural": "Columns"
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            "13": {
                "singular": "Column",
                "plural": "Columns"
            },
            "14": {
                "singular": "Scale 1 Option",
                "plural": "Scale 1 Options"
            },
            "30": {
                "singular": "Rating",
                "plural": "Ratings"
            },
            "31": {
                "singular": "Rating",
                "plural": "Ratings"
            },
            "32": {
                "singular": "Category",
                "plural": "Categories"
            }
        },
        "dimThreeItemLabels": {
            "14": {
                "singular": "Scale 2 Option",
                "plural": "Scale 2 Options"
            }
        },
        "questionTypeDefs": {
            "2": {
                "label": "<span class=\"lsq-adder__drop-link far fa-caret-square-down\"></span> Dropdown List",
                "name": "ListDropdown",
                "order": 6
            },
            "4": {
                "label": "<span class=\"lsq-adder__drop-link far fa-dot-circle\"></span> Multiple Choice",
                "name": "List",
                "order": 0
            },
            "6": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-th\"></span> Multiple Choice Grid",
                "name": "Array",
                "order": 3
            },
            "15": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-calendar-day\"></span> Date/Time",
                "name": "Date",
                "order": 13
            },
            "17": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-upload\"></span> File Upload",
                "name": "File",
                "order": 14
            },
            "19": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-calculator\"></span> Numerical Input",
                "name": "NumInput",
                "order": 12
            },
            "21": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-random\"></span> Ranking",
                "name": "Ranking",
                "order": 7
            },
            "22": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-info-circle\"></span> Text Display",
                "name": "TextDisplay",
                "order": 17
            },
            "23": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-thumbs-up\"></span> Yes/No",
                "name": "YesNo",
                "order": 15
            },
            "24": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-i-cursor\"></span> Short Answer",
                "name": "ShortText",
                "order": 9
            },
            "25": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-align-left\"></span> Paragraph",
                "name": "LongText",
                "order": 10
            },
            "27": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-list\"></span> Short Answer Form",
                "name": "MultiShortText",
                "order": 11
            },
            "28": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-check-square\"></span> Checkboxes",
                "name": "MultiChoice",
                "order": 1
            },
            "30": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-sort-numeric-down\"></span> Rating Scale",
                "name": "RatingScale",
                "order": 2
            },
            "31": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-th\"></span> Rating Scale Grid",
                "name": "ArrayRating",
                "order": 4
            },
            "32": {
                "label": "<span class=\"lsq-adder__drop-link far fa-clone\"></span> Card Sort",
                "name": "CardSort",
                "order": 8
            },
            "34": {
                "label": "<span class=\"lsq-adder__drop-link fas fa-filter\"></span> Complex Quota",
                "name": "ComplexQuota",
                "order": 16
            }
        },
        "inTaskTextLocStates": {
            "static": {
                "id": "static",
                "markup": "Locked to Bottom"
            },
            "bl": {
                "id": "bl",
                "markup": "Bottom Left Corner"
            },
            "bc": {
                "id": "bc",
                "markup": "Bottom Center"
            },
            "br": {
                "id": "br",
                "markup": "Bottom Right Corner"
            },
            "ml": {
                "id": "ml",
                "markup": "Middle Left"
            },
            "mc": {
                "id": "mc",
                "markup": "Centered"
            },
            "mr": {
                "id": "mr",
                "markup": "Middle Right"
            },
            "tl": {
                "id": "tl",
                "markup": "Top Left Corner"
            },
            "tc": {
                "id": "tc",
                "markup": "Top Center"
            },
            "tr": {
                "id": "tr",
                "markup": "Top Right Corner"
            }
        },
        "activeEditEntity": null,
        "activeEditedTreeStructures": [],
        "activeEditTreeStructuresBackup": [],
        "activeEditEntityBackups": {},
        "activeEditFilterBackups": {
            "questionFilters": null,
            "groupFilters": null,
            "conditionFilters": null,
            "taskFilters": null
        },
        "activeEditEntityLinkBackups": null,
        "editLogTemplate": {
            "entities": {},
            "filterCopies": {
                "questionFilters": {
                    "edited": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    },
                    "original": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    }
                },
                "taskFilters": {
                    "edited": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    },
                    "original": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    }
                },
                "groupFilters": {
                    "edited": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    },
                    "original": {
                        "filters": {},
                        "displayStrings": {},
                        "enabled": {}
                    }
                },
                "conditionFilters": {
                    "edited": {
                        "filters": {},
                        "displayStrings": {},
                        "conditionAssignments": {}
                    },
                    "original": {
                        "filters": {},
                        "displayStrings": {},
                        "conditionAssignments": {}
                    }
                }
            },
            "studySettings": {}
        },
        "studyNeedsBuild": false
    },
    "draftUpdatedAt": "2023-06-21 15:45:52"
};

var testCopy = null;

var deepClone = function(obj) {
    var out;
    if (Array.isArray(obj)) {
        out = [];
        for (var index = 0; index < obj.length; ++index) {
            let subArray = obj[index];
            out.push((subArray === null) ? subArray : (subArray instanceof Date) ? new Date(subArray.valueOf()) : (typeof subArray === 'object') ? deepClone(subArray) : subArray);
        }
    } else {
        out = {};
        for (var key in obj) {
            var subObject = obj[key];
            out[key] = subObject === null ? subObject : subObject instanceof Date ? new Date(subObject.valueOf()) : (typeof subObject === 'object') ? deepClone(subObject) : subObject;


        }
    }
    return out;
};

Tests:

Lodash cloneDeep
testCopy = _.cloneDeep(testArray);
Native JSON parse
testCopy = JSON.parse(JSON.stringify(testArray));
Recursive deep clone
testCopy = deepClone(testArray);
Object.assign shallow clone
testCopy = Object.assign([...testArray]);
structuredClone
testCopy = structuredClone(testArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Native JSON parse
Recursive deep clone
Object.assign shallow clone
structuredClone

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Linux

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	2941.1 Ops/sec
Native JSON parse	4170.4 Ops/sec
Recursive deep clone	3451.7 Ops/sec
Object.assign shallow clone	0.0 Ops/sec
structuredClone	3954.3 Ops/sec

Large Object cloning (version: 0)

compare array copy/clone methods sdfewfe

Comparing performance of: Lodash cloneDeep vs Native JSON parse vs Recursive deep clone vs Object.assign shallow clone vs structuredClone

Created: 10 months ago by: Guest

Jump to the latest result

Lodash cloneDeep

Native JSON parse

Recursive deep clone

Object.assign shallow clone

structuredClone

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A