Benchmark: Deep equality - MeasureThat.net

HTML Preparation code:

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

Script Preparation code:

window.isEqualStringify = (obj1, obj2) => JSON.stringify(obj1) === JSON.stringify(obj2);
window.isEqualLodash = _.isEqual;

window.test1 = {
  obj: {},
  arr: [],
};

for (let i = 0; i < 1000; i++) {
  test1.obj['prop_' + i] = {};
  
  let arrReference = [];
  test1.arr.push(arrReference);
  
  let objReference = test1.obj['prop_' + i];
  for (let j = 0; j < i; j++) {
    objReference['internal_prop_' + j] = {};
    objReference = objReference['internal_prop_' + j];
    
    arrReference.push(j);
  }
}

window.test2 = JSON.parse(JSON.stringify(test1));

Tests:

JSON.stringify
isEqualStringify(test1, test2)
lodash.isEqual
isEqualLodash(test1, test2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
JSON.stringify
lodash.isEqual

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

Browser/OS: Chrome 76 on Windows

View result in a separate tab

Test name	Executions per second
JSON.stringify	2.8 Ops/sec
lodash.isEqual	1.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark compares two methods for comparing objects: `JSON.stringify` and `lodash.isEqual`.

**Options Compared**

There are two options being compared:

1. **JSON.stringify**: This method converts an object to a string using `JSON.stringify()`. This approach has the following pros and cons:
	* Pros:
		+ Simple to implement
		+ Fast, as it only requires a single function call
	* Cons:
		+ Not suitable for deep equality checks, as it only compares the top-level structure of objects
		+ Can be vulnerable to string manipulation attacks if not used carefully
2. **lodash.isEqual**: This method uses the Lodash library to compare objects recursively. This approach has the following pros and cons:
	* Pros:
		+ Suitable for deep equality checks
		+ Robust and reliable, as it handles various edge cases correctly
	* Cons:
		+ Requires the Lodash library, which may add overhead
		+ May be slower than `JSON.stringify` due to the recursive nature of the comparison

**Library: lodash**

The `lodash.isEqual` function is part of the Lodash library. Lodash is a popular JavaScript utility library that provides various functions for tasks such as array manipulation, object creation, and string manipulation.

In this benchmark, the `lodash.isEqual` function is used to compare two objects recursively, ensuring that all properties, including nested objects and arrays, are taken into account during the comparison.

**Other Considerations**

When choosing between these two approaches, consider the following:

* If you need to perform deep equality checks on complex objects, use `lodash.isEqual`.
* If you only need to compare the top-level structure of objects and don't mind potential issues with string manipulation attacks, use `JSON.stringify`.

**Alternatives**

Other alternatives for comparing objects include:

1. **Object.prototype.toString.call()**: This method uses the `toString()` method on an object's prototype chain to get a string representation of the object.
2. **For...in loops**: These can be used to compare properties of an object, but may not handle nested objects or arrays correctly.

However, these alternatives are generally less reliable and more error-prone than using a dedicated equality function like `lodash.isEqual` or implementing your own deep equality check using `JSON.stringify`.

Related benchmarks:

Deep equality (version: 3)

Comapison of two methods of objects comparison: by strings of JSON.stringify and isEqual

Comparing performance of: JSON.stringify vs lodash.isEqual

Created: 5 years ago by: Registered User

Jump to the latest result

JSON.stringify

lodash.isEqual

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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