Benchmark: Lodash cloneDeep vs structuredClone vs node-clone no circular check, cloning of configs

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					}
				],
				"reasonTemplates": [
					{
						"tokenizedText": null,
						"crmFieldName": "",
						"destination": "Suggestion"
					},
					{
						"tokenizedText": null,
						"crmFieldName": "",
						"destination": "Insight"
					},
					{
						"tokenizedText": null,
						"crmFieldName": "",
						"destination": "EnhancedInsight"
					}
				]
			}
		]
	},
	"directory": null,
	"configLock": {
		"lockUID": "",
		"entityId": "210-2",
		"lockOwner": "demo",
		"lockOwnerName": "demo",
		"lockExpiration": "2020-09-28T18:01:24Z",
		"disableConfigLocking": "false"
	}
}`);

var myCopy = null;

var cloneDeep = function(obj) {
	if (!obj || typeof obj !== 'object') {
		return obj;
	} else if (_.isString(obj)) {
		return String.prototype.slice.call(obj);
	} else if (_.isDate(obj)) {
		return new Date(obj.getTime());
	} else if (_.isFunction(obj.clone)) {
		return obj.clone();
	} else if (_.isArray(obj)) {
		return _.map(obj, (t) => {
			return cloneDeep(t);
		});
	} else {
		return _.mapValues(obj, (val) => {
			return cloneDeep(val);
		});
	}
};

var clone = (function() {
'use strict';

function _instanceof(obj, type) {
  return type != null && obj instanceof type;
}

var nativeMap;
try {
  nativeMap = Map;
} catch(_) {
  // maybe a reference error because no `Map`. Give it a dummy value that no
  // value will ever be an instanceof.
  nativeMap = function() {};
}

var nativeSet;
try {
  nativeSet = Set;
} catch(_) {
  nativeSet = function() {};
}

var nativePromise;
try {
  nativePromise = Promise;
} catch(_) {
  nativePromise = function() {};
}

/**
 * Clones (copies) an Object using deep copying.
 *
 * This function supports circular references by default, but if you are certain
 * there are no circular references in your object, you can save some CPU time
 * by calling clone(obj, false).
 *
 * Caution: if `circular` is false and `parent` contains circular references,
 * your program may enter an infinite loop and crash.
 *
 * @param `parent` - the object to be cloned
 * @param `circular` - set to true if the object to be cloned may contain
 *    circular references. (optional - true by default)
 * @param `depth` - set to a number if the object is only to be cloned to
 *    a particular depth. (optional - defaults to Infinity)
 * @param `prototype` - sets the prototype to be used when cloning an object.
 *    (optional - defaults to parent prototype).
 * @param `includeNonEnumerable` - set to true if the non-enumerable properties
 *    should be cloned as well. Non-enumerable properties on the prototype
 *    chain will be ignored. (optional - false by default)
*/
function clone(parent, circular, depth, prototype, includeNonEnumerable) {
  if (typeof circular === 'object') {
    depth = circular.depth;
    prototype = circular.prototype;
    includeNonEnumerable = circular.includeNonEnumerable;
    circular = circular.circular;
  }
  // maintain two arrays for circular references, where corresponding parents
  // and children have the same index
  var allParents = [];
  var allChildren = [];

  var useBuffer = typeof Buffer != 'undefined';

  if (typeof circular == 'undefined')
    circular = true;

  if (typeof depth == 'undefined')
    depth = Infinity;

  // recurse this function so we don't reset allParents and allChildren
  function _clone(parent, depth) {
    // cloning null always returns null
    if (parent === null)
      return null;

    if (depth === 0)
      return parent;

    var child;
    var proto;
    if (typeof parent != 'object') {
      return parent;
    }

    if (_instanceof(parent, nativeMap)) {
      child = new nativeMap();
    } else if (_instanceof(parent, nativeSet)) {
      child = new nativeSet();
    } else if (_instanceof(parent, nativePromise)) {
      child = new nativePromise(function (resolve, reject) {
        parent.then(function(value) {
          resolve(_clone(value, depth - 1));
        }, function(err) {
          reject(_clone(err, depth - 1));
        });
      });
    } else if (clone.__isArray(parent)) {
      child = [];
    } else if (clone.__isRegExp(parent)) {
      child = new RegExp(parent.source, __getRegExpFlags(parent));
      if (parent.lastIndex) child.lastIndex = parent.lastIndex;
    } else if (clone.__isDate(parent)) {
      child = new Date(parent.getTime());
    } else if (useBuffer && Buffer.isBuffer(parent)) {
      if (Buffer.from) {
        // Node.js >= 5.10.0
        child = Buffer.from(parent);
      } else {
        // Older Node.js versions
        child = new Buffer(parent.length);
        parent.copy(child);
      }
      return child;
    } else if (_instanceof(parent, Error)) {
      child = Object.create(parent);
    } else {
      if (typeof prototype == 'undefined') {
        proto = Object.getPrototypeOf(parent);
        child = Object.create(proto);
      }
      else {
        child = Object.create(prototype);
        proto = prototype;
      }
    }

    if (circular) {
      var index = allParents.indexOf(parent);

      if (index != -1) {
        return allChildren[index];
      }
      allParents.push(parent);
      allChildren.push(child);
    }

    if (_instanceof(parent, nativeMap)) {
      parent.forEach(function(value, key) {
        var keyChild = _clone(key, depth - 1);
        var valueChild = _clone(value, depth - 1);
        child.set(keyChild, valueChild);
      });
    }
    if (_instanceof(parent, nativeSet)) {
      parent.forEach(function(value) {
        var entryChild = _clone(value, depth - 1);
        child.add(entryChild);
      });
    }

    for (var i in parent) {
      var attrs = Object.getOwnPropertyDescriptor(parent, i);
      if (attrs) {
        child[i] = _clone(parent[i], depth - 1);
      }

      try {
        var objProperty = Object.getOwnPropertyDescriptor(parent, i);
        if (objProperty.set === 'undefined') {
          // no setter defined. Skip cloning this property
          continue;
        }
        child[i] = _clone(parent[i], depth - 1);
      } catch(e){
        if (e instanceof TypeError) {
          // when in strict mode, TypeError will be thrown if child[i] property only has a getter
          // we can't do anything about this, other than inform the user that this property cannot be set.
          continue
        } else if (e instanceof ReferenceError) {
          //this may happen in non strict mode
          continue
        }
      }

    }

    if (Object.getOwnPropertySymbols) {
      var symbols = Object.getOwnPropertySymbols(parent);
      for (var i = 0; i < symbols.length; i++) {
        // Don't need to worry about cloning a symbol because it is a primitive,
        // like a number or string.
        var symbol = symbols[i];
        var descriptor = Object.getOwnPropertyDescriptor(parent, symbol);
        if (descriptor && !descriptor.enumerable && !includeNonEnumerable) {
          continue;
        }
        child[symbol] = _clone(parent[symbol], depth - 1);
        Object.defineProperty(child, symbol, descriptor);
      }
    }

    if (includeNonEnumerable) {
      var allPropertyNames = Object.getOwnPropertyNames(parent);
      for (var i = 0; i < allPropertyNames.length; i++) {
        var propertyName = allPropertyNames[i];
        var descriptor = Object.getOwnPropertyDescriptor(parent, propertyName);
        if (descriptor && descriptor.enumerable) {
          continue;
        }
        child[propertyName] = _clone(parent[propertyName], depth - 1);
        Object.defineProperty(child, propertyName, descriptor);
      }
    }

    return child;
  }

  return _clone(parent, depth);
}

/**
 * Simple flat clone using prototype, accepts only objects, usefull for property
 * override on FLAT configuration object (no nested props).
 *
 * USE WITH CAUTION! This may not behave as you wish if you do not know how this
 * works.
 */
clone.clonePrototype = function clonePrototype(parent) {
  if (parent === null)
    return null;

  var c = function () {};
  c.prototype = parent;
  return new c();
};

// private utility functions

function __objToStr(o) {
  return Object.prototype.toString.call(o);
}
clone.__objToStr = __objToStr;

function __isDate(o) {
  return typeof o === 'object' && __objToStr(o) === '[object Date]';
}
clone.__isDate = __isDate;

function __isArray(o) {
  return typeof o === 'object' && __objToStr(o) === '[object Array]';
}
clone.__isArray = __isArray;

function __isRegExp(o) {
  return typeof o === 'object' && __objToStr(o) === '[object RegExp]';
}
clone.__isRegExp = __isRegExp;

function __getRegExpFlags(re) {
  var flags = '';
  if (re.global) flags += 'g';
  if (re.ignoreCase) flags += 'i';
  if (re.multiline) flags += 'm';
  return flags;
}
clone.__getRegExpFlags = __getRegExpFlags;

return clone;
})();

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Native structuredClone
myCopy = structuredClone(MyObject);
clone();
myCopy = clone(MyObject, false);
_cloneDeep custom underscore/lodash
myCopy = cloneDeep(MyObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash cloneDeep
Native structuredClone
clone();
_cloneDeep custom underscore/lodash

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Lodash cloneDeep	19246.3 Ops/sec
Native structuredClone	22212.0 Ops/sec
clone();	182.9 Ops/sec
_cloneDeep custom underscore/lodash	12063.9 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'll do my best to analyze the provided code snippets and provide an answer.

The code appears to be a benchmarking script that compares the performance of different cloning functions: `structuredClone`, `clone()`, and a custom `_cloneDeep` function from the underscore/lodash library.

Here's a brief analysis:

1. The first section defines a private utility function `__objToStr(o)` for converting objects to strings, which is used by some of the testing functions.
2. The second section defines several more utility functions:
	* `__isDate(o)`: checks if an object is a Date
	* `__isArray(o)`: checks if an object is an Array
	* `__isRegExp(o)`: checks if an object is a RegExp
	* `__getRegExpFlags(re)`: extracts flags from a RegExp object
3. The third section defines the benchmarking functions:
	* `clone()`: returns a deep clone of the input object using the `_objToStr` function and some other implementation details (not shown in this snippet)
	* `_cloneDeep custom underscore/lodash`: uses the underscore/lodash library to perform a deep clone
4. The last section defines an array of individual test cases, each with a benchmark definition and test name.

Now, I'll try to answer your question based on this analysis:

What is the performance difference between `structuredClone` and `_cloneDeep custom underscore/lodash`?

According to the provided benchmark results, the order of performance from fastest to slowest is:

1. Native `structuredClone`: ~22212 executions per second
2. Lodash `cloneDeep`: ~19246 executions per second
3. Custom `_cloneDeep` function: ~12063 executions per second

Therefore, `structuredClone` appears to be the fastest of the three options, followed closely by the Lodash implementation. However, please note that this analysis is based on a single benchmarking script and may not be representative of real-world usage or performance differences in other scenarios.

Please provide more context or clarify any specific questions you have regarding this analysis!

Related benchmarks:

Lodash cloneDeep vs structuredClone vs node-clone no circular check, cloning of configs (version: 0)

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

Comparing performance of: Lodash cloneDeep vs Native structuredClone vs clone(); vs _cloneDeep custom underscore/lodash

Created: 3 years ago by: Guest

Jump to the latest result

Lodash cloneDeep

Native structuredClone

clone();

_cloneDeep custom underscore/lodash

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):