Benchmark: Lodash.isEqual vs JSON.stringify Equality Comparison for Array of objects

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

window.foo = [{name: 'cat'}, {name: 'dog'}, {name: 'bird'}]; 
window.bar = [{name: 'cat'}, {name: 'dog'}, {name: 'bird'}];

Tests:

_.isEqual
_.isEqual(window.foo, window.bar)
JSON.stringify
JSON.stringify(window.foo) === JSON.stringify(window.bar);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
JSON.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.

Let's break down the benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark tests two approaches to compare equality between two arrays of objects: `Lodash.isEqual` and `JSON.stringify Equality Comparison`.

**Options Compared**

Two options are compared:

1. **Lodash.isEqual**: This function from the Lodash library is used to compare two values for deep equality.
2. **JSON.stringify Equality Comparison**: This approach uses the `JSON.stringify()` method to convert both arrays into strings, and then compares these strings using the `===` operator.

**Pros and Cons of Each Approach**

1. **Lodash.isEqual**:
	* Pros: Designed specifically for comparing complex data structures like arrays of objects, efficient implementation, and easy to use.
	* Cons: Requires including an additional library (Lodash), may have slower startup times due to the overhead of loading Lodash.
2. **JSON.stringify Equality Comparison**:
	* Pros: Fast, lightweight, and doesn't require any additional libraries. However, it may not be suitable for complex data structures or nested objects.
	* Cons: Can be brittle if the JSON string representation changes unexpectedly.

**Library Used**

The `JSON.stringify()` method is a built-in JavaScript function that converts a value to a JSON string. In this benchmark, it's used in combination with the `===` operator to compare two arrays of objects as strings.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax used in this benchmark.

**Other Alternatives**

If you don't want to use Lodash for equality comparisons, other alternatives include:

1. **Using a custom implementation**: You can implement your own function to compare two values for deep equality.
2. **Using a different library**: Other libraries like `lodash-es` or `js-yaml` provide similar functionality to Lodash.

In summary, the benchmark tests two approaches to compare equality between arrays of objects: Lodash's `isEqual` function and `JSON.stringify Equality Comparison`. The choice between these options depends on your specific use case, performance requirements, and personal preference.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36

Browser/OS: Chrome 89 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
_.isEqual	344816.8 Ops/sec
JSON.stringify	385622.8 Ops/sec

Related benchmarks:

Lodash.isEqual vs JSON.stringify Equality Comparison for Array of objects (version: 0)

Test on isEqual performance

Comparing performance of: _.isEqual vs JSON.stringify

Created: 3 years ago by: Guest

Jump to the latest result

_.isEqual

JSON.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):