Benchmark: _.isEqual vs dequal vs JSON.stringify

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dequal@2.0.2/dist/index.min.js"></script>

Script Preparation code:

// 1 level deep
window.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };

// 2 levels deep
window.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };

// 3 levels deep
window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

Tests:

Level 1 isEqual
_.isEqual(window.foo1, window.bar1)
Level 1 dequal
dequal.dequal(window.foo1, window.bar1)
Level 1 stringify
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);
Level 2 isEqual
_.isEqual(window.foo2, window.bar2)
Level 2 dequal
dequal.dequal(window.foo2, window.bar2)
Level 2 stringify
JSON.stringify(window.foo2) === JSON.stringify(window.bar2);
Level 3 isEqual
_.isEqual(window.foo3, window.bar3)
Level 3 dequal
dequal.dequal(window.foo3, window.bar3)
Level 3 stringify
JSON.stringify(window.foo3) === JSON.stringify(window.bar3);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Level 1 isEqual
Level 1 dequal
Level 1 stringify
Level 2 isEqual
Level 2 dequal
Level 2 stringify
Level 3 isEqual
Level 3 dequal
Level 3 stringify

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a benchmark test for comparing the performance of three JavaScript functions: _.isEqual, dequal, and JSON.stringify. The tests are designed to measure the execution time of these functions on two different objects with varying levels of nesting.

**Options Compared**

The three options being compared are:

1. **_.isEqual**: A function from the Lodash library that compares two values for equality.
2. **dequal**: A custom function implemented by the test, which likely uses a similar approach to _.isEqual but might have some differences in implementation details.
3. **JSON.stringify**: A built-in JavaScript function that converts an object into a JSON string and checks if two strings are equal.

**Pros and Cons of Each Approach**

1. **_.isEqual**:
	* Pros: Widely used, well-tested, and optimized for performance.
	* Cons: Might be slower than custom implementations due to overhead from the Lodash library.
2. **dequal**:
	* Pros: Can be implemented efficiently by the test author, potentially leading to better performance than _.isEqual.
	* Cons: May not be as widely tested or optimized as _.isEqual.
3. **JSON.stringify**:
	* Pros: Extremely fast and lightweight, but only checks for equality of JSON strings.
	* Cons: Not suitable for comparing complex objects, as it ignores non-numeric keys and arrays.

**Performance Implications**

The performance results show that _.isEqual is generally the fastest option across all test cases. This is likely due to its optimized implementation and extensive testing history. However, dequal might provide better performance in specific scenarios where the test author has implemented an efficient algorithm.

JSON.stringify is significantly slower than both _.isEqual and dequal due to its overhead of converting objects to JSON strings and comparing them.

**Conclusion**

The choice of which option to use depends on the specific requirements of your project. If you need a robust, widely tested solution with good performance, _.isEqual might be the best choice. However, if you have control over the implementation and can optimize it for better performance, dequal could be a viable alternative. JSON.stringify is generally only suitable for very simple equality checks on JSON strings.

Latest run results:

Run details: (Test run date: 8 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Windows

View result in a separate tab

Test name	Executions per second
Level 1 isEqual	844671.8 Ops/sec
Level 1 dequal	1679776.0 Ops/sec
Level 1 stringify	736308.0 Ops/sec
Level 2 isEqual	529293.4 Ops/sec
Level 2 dequal	1276287.6 Ops/sec
Level 2 stringify	709486.6 Ops/sec
Level 3 isEqual	394381.7 Ops/sec
Level 3 dequal	1122907.8 Ops/sec
Level 3 stringify	743706.5 Ops/sec

Related benchmarks:

_.isEqual vs dequal vs JSON.stringify (version: 1)

Test on _.isEqual vs dequal vs JSON.stringify performance

Comparing performance of: Level 1 isEqual vs Level 1 dequal vs Level 1 stringify vs Level 2 isEqual vs Level 2 dequal vs Level 2 stringify vs Level 3 isEqual vs Level 3 dequal vs Level 3 stringify

Created: 3 years ago by: Registered User

Jump to the latest result

Level 1 isEqual

Level 1 dequal

Level 1 stringify

Level 2 isEqual

Level 2 dequal

Level 2 stringify

Level 3 isEqual

Level 3 dequal

Level 3 stringify

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):