Benchmark: Lodash cloneDeep vs structuredClone vs JSON.parse + JSON.stringify but with big data & 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...',
    big: {
      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...',
        big: {
          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...',
            big: {
              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...',
                big: {
                  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...',
                    big: {
                      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...',
                        big: {
                          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...',
                            big: {
                              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...',
                                big: {
                                  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...',
                                    big: {
                                      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...',
                                        big: {
                                          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...',
                                            big: {
                                              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...',
                                                big: {
                                                  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...',
                                                    big: {
                                                      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...',
                                                        big: {
                                                          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...',
                                                            big: {
                                                              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...'
                                                              }
                                                            }
                                                          }
                                                        }
                                                      }
                                                    }
                                                  }
                                                }
                                              }
                                            }
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
};

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;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Native structuredClone
myCopy = structuredClone(MyObject);
JSON.parse
myCopy = JSON.parse(JSON.stringify(MyObject))
custom deepClone
myCopy = deepClone(MyObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Native structuredClone
JSON.parse
custom deepClone

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	110874.6 Ops/sec
Native structuredClone	91628.9 Ops/sec
JSON.parse	161932.6 Ops/sec
custom deepClone	332865.2 Ops/sec

Related benchmarks:

Lodash cloneDeep vs structuredClone vs JSON.parse + JSON.stringify but with big data & deepClone (version: 1)

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

Comparing performance of: Lodash cloneDeep vs Native structuredClone vs JSON.parse vs custom deepClone

Created: 5 months ago by: Guest

Jump to the latest result

Lodash cloneDeep

Native structuredClone

JSON.parse

custom deepClone

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A