Benchmark: Lodash cloneDeep vs structuredClone deep array vs deepClone

HTML Preparation code:

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

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...',
    jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...',
      jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...',
        jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
  }
  }
  }
};

// pulled this from https://github.com/nodejs/node/issues/34355#issuecomment-658394617
function deepClone(o) {
    if (typeof o !== "object") {
      return o
    }
    if (!o) {
      return o
    }

    // https://jsperf.com/deep-copy-vs-json-stringify-json-parse/25
    if (Array.isArray(o)) {
      const newO = []
      for (let i = 0; i < o.length; i += 1) {
        const val = !o[i] || typeof o[i] !== "object" ? o[i] : deepClone(o[i])
        newO[i] = val === undefined ? null : val
      }
      return newO
    }

    const newO = {}
    for (const i of Object.keys(o)) {
      const val = !o[i] || typeof o[i] !== "object" ? o[i] : deepClone(o[i])
      if (val === undefined) {
        continue
      }
      newO[i] = val
    }
    return newO
  }
var myCopy = null;

var arr = []
var arr2 = []
for (let i = 0; i <=10000; i++) {
  arr.push(structuredClone(MyObject))
}

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(arr);
Native structuredClone
myCopy = structuredClone(arr);
custom deeClone
myCopy = deepClone(arr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Native structuredClone
custom deeClone

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	61.3 Ops/sec
Native structuredClone	60.4 Ops/sec
custom deeClone	241.7 Ops/sec

Related benchmarks:

Lodash cloneDeep vs structuredClone deep array vs deepClone (version: 1)

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

Comparing performance of: Lodash cloneDeep vs Native structuredClone vs custom deeClone

Created: 5 months ago by: Guest

Jump to the latest result

Lodash cloneDeep

Native structuredClone

custom deeClone

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A