Benchmark: deepCopy perf test

Script Preparation code:


var data_in = [
    {
        "id": 1,
        "name": "Leanne Graham",
        "username": "Bret",
        "email": "Sincere@april.biz",
        "address": {
            "street": "Kulas Light",
            "suite": "Apt. 556",
            "city": "Gwenborough",
            "zipcode": "92998-3874",
            "geo": {
                "lat": "-37.3159",
                "lng": "81.1496"
            }
        },
        "phone": "1-770-736-8031 x56442",
        "website": "hildegard.org",
        "company": {
            "name": "Romaguera-Crona",
            "catchPhrase": "Multi-layered client-server neural-net",
            "bs": "harness real-time e-markets"
        }
    },
    {
        "id": 2,
        "name": "Ervin Howell",
        "username": "Antonette",
        "email": "Shanna@melissa.tv",
        "address": {
            "street": "Victor Plains",
            "suite": "Suite 879",
            "city": "Wisokyburgh",
            "zipcode": "90566-7771",
            "geo": {
                "lat": "-43.9509",
                "lng": "-34.4618"
            }
        },
        "phone": "010-692-6593 x09125",
        "website": "anastasia.net",
        "company": {
            "name": "Deckow-Crist",
            "catchPhrase": "Proactive didactic contingency",
            "bs": "synergize scalable supply-chains"
        }
    },
    {
        "id": 3,
        "name": "Clementine Bauch",
        "username": "Samantha",
        "email": "Nathan@yesenia.net",
        "address": {
            "street": "Douglas Extension",
            "suite": "Suite 847",
            "city": "McKenziehaven",
            "zipcode": "59590-4157",
            "geo": {
                "lat": "-68.6102",
                "lng": "-47.0653"
            }
        },
        "phone": "1-463-123-4447",
        "website": "ramiro.info",
        "company": {
            "name": "Romaguera-Jacobson",
            "catchPhrase": "Face to face bifurcated interface",
            "bs": "e-enable strategic applications"
        }
    },
    {
        "id": 4,
        "name": "Patricia Lebsack",
        "username": "Karianne",
        "email": "Julianne.OConner@kory.org",
        "address": {
            "street": "Hoeger Mall",
            "suite": "Apt. 692",
            "city": "South Elvis",
            "zipcode": "53919-4257",
            "geo": {
                "lat": "29.4572",
                "lng": "-164.2990"
            }
        },
        "phone": "493-170-9623 x156",
        "website": "kale.biz",
        "company": {
            "name": "Robel-Corkery",
            "catchPhrase": "Multi-tiered zero tolerance productivity",
            "bs": "transition cutting-edge web services"
        }
    },
    {
        "id": 5,
        "name": "Chelsey Dietrich",
        "username": "Kamren",
        "email": "Lucio_Hettinger@annie.ca",
        "address": {
            "street": "Skiles Walks",
            "suite": "Suite 351",
            "city": "Roscoeview",
            "zipcode": "33263",
            "geo": {
                "lat": "-31.8129",
                "lng": "62.5342"
            }
        },
        "phone": "(254)954-1289",
        "website": "demarco.info",
        "company": {
            "name": "Keebler LLC",
            "catchPhrase": "User-centric fault-tolerant solution",
            "bs": "revolutionize end-to-end systems"
        }
    },
    {
        "id": 6,
        "name": "Mrs. Dennis Schulist",
        "username": "Leopoldo_Corkery",
        "email": "Karley_Dach@jasper.info",
        "address": {
            "street": "Norberto Crossing",
            "suite": "Apt. 950",
            "city": "South Christy",
            "zipcode": "23505-1337",
            "geo": {
                "lat": "-71.4197",
                "lng": "71.7478"
            }
        },
        "phone": "1-477-935-8478 x6430",
        "website": "ola.org",
        "company": {
            "name": "Considine-Lockman",
            "catchPhrase": "Synchronised bottom-line interface",
            "bs": "e-enable innovative applications"
        }
    },
    {
        "id": 7,
        "name": "Kurtis Weissnat",
        "username": "Elwyn.Skiles",
        "email": "Telly.Hoeger@billy.biz",
        "address": {
            "street": "Rex Trail",
            "suite": "Suite 280",
            "city": "Howemouth",
            "zipcode": "58804-1099",
            "geo": {
                "lat": "24.8918",
                "lng": "21.8984"
            }
        },
        "phone": "210.067.6132",
        "website": "elvis.io",
        "company": {
            "name": "Johns Group",
            "catchPhrase": "Configurable multimedia task-force",
            "bs": "generate enterprise e-tailers"
        }
    },
    {
        "id": 8,
        "name": "Nicholas Runolfsdottir V",
        "username": "Maxime_Nienow",
        "email": "Sherwood@rosamond.me",
        "address": {
            "street": "Ellsworth Summit",
            "suite": "Suite 729",
            "city": "Aliyaview",
            "zipcode": "45169",
            "geo": {
                "lat": "-14.3990",
                "lng": "-120.7677"
            }
        },
        "phone": "586.493.6943 x140",
        "website": "jacynthe.com",
        "company": {
            "name": "Abernathy Group",
            "catchPhrase": "Implemented secondary concept",
            "bs": "e-enable extensible e-tailers"
        }
    },
    {
        "id": 9,
        "name": "Glenna Reichert",
        "username": "Delphine",
        "email": "Chaim_McDermott@dana.io",
        "address": {
            "street": "Dayna Park",
            "suite": "Suite 449",
            "city": "Bartholomebury",
            "zipcode": "76495-3109",
            "geo": {
                "lat": "24.6463",
                "lng": "-168.8889"
            }
        },
        "phone": "(775)976-6794 x41206",
        "website": "conrad.com",
        "company": {
            "name": "Yost and Sons",
            "catchPhrase": "Switchable contextually-based project",
            "bs": "aggregate real-time technologies"
        }
    },
    {
        "id": 10,
        "name": "Clementina DuBuque",
        "username": "Moriah.Stanton",
        "email": "Rey.Padberg@karina.biz",
        "address": {
            "street": "Kattie Turnpike",
            "suite": "Suite 198",
            "city": "Lebsackbury",
            "zipcode": "31428-2261",
            "geo": {
                "lat": "-38.2386",
                "lng": "57.2232"
            }
        },
        "phone": "024-648-3804",
        "website": "ambrose.net",
        "company": {
            "name": "Hoeger LLC",
            "catchPhrase": "Centralized empowering task-force",
            "bs": "target end-to-end models"
        }
    }
]

var data = undefined


// creates a deep copy of a javascript object
var deepCopy = (obj) => {
    if (obj === null || typeof obj !== 'object') {
        return obj;
    }
    var copy = obj.constructor();
    for (var attr in obj) {
        if (obj.hasOwnProperty(attr)) {
            copy[attr] = deepCopy(obj[attr]);
        }
    }
    return copy;
}


var deepCopy2 = (obj) => {
    if(typeof obj !== 'object' || obj === null) {
        return obj;
    }

    if(obj instanceof Date) {
        return new Date(obj.getTime());
    }

    if(obj instanceof Array) {
        return obj.reduce((arr, item, i) => {
            arr[i] = deepCopy(item);
            return arr;
        }, []);
    }

    if(obj instanceof Object) {
        return Object.keys(obj).reduce((newObj, key) => {
            newObj[key] = deepCopy(obj[key]);
            return newObj;
        }, {})
    }
}

Tests:

Structured clone
for (let d of data_in) { data = structuredClone(d) }
Deep copy
for (let d of data_in) { data = deepCopy(d) }
JSON stringify + parse
for (let d of data_in) { data = JSON.parse(JSON.stringify(d)) }
Spread operator
for (let d of data_in) { data = {...d} }
Deep copy 2
for (let d of data_in) { data = deepCopy2(d) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Structured clone
Deep copy
JSON stringify + parse
Spread operator
Deep copy 2

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0

Browser/OS: Firefox 110 on Linux

View result in a separate tab

Test name	Executions per second
Structured clone	12562.4 Ops/sec
Deep copy	89332.1 Ops/sec
JSON stringify + parse	20764.4 Ops/sec
Spread operator	359677.3 Ops/sec
Deep copy 2	75636.2 Ops/sec

Related benchmarks:

deepCopy perf test (version: 0)

Structured clone vs manual deep copy function vs JSON stringify vs {...}

Comparing performance of: Structured clone vs Deep copy vs JSON stringify + parse vs Spread operator vs Deep copy 2

Created: one year ago by: Registered User

Jump to the latest result

Structured clone

Deep copy

JSON stringify + parse

Spread operator

Deep copy 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):