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

HTML Preparation code:

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

Script Preparation code:

window.foo = { a: { b: ['cat', 'dog', 'bird']}, c: { d: [42, '42', { val: true}]}};
window.bar = { a: { b: ['cat', 'dog', 'bird']}, c: { d: [42, '42', { val: null}]}};

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

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Purpose:**
The benchmark is designed to compare the performance of two approaches for equality comparison on deep objects:

1. Using Lodash's `_.isEqual` function.
2. Using `JSON.stringify` and comparing the resulting strings.

**Options Compared:**

* **Lodash's _.isEqual**: This function is part of the Lodash library, which is a popular utility library for JavaScript. It provides various functions to manipulate data structures, including equality checks.
* **JSON.stringify + Comparison**: This approach uses the `JSON.stringify` method to convert both objects into strings and then compares these strings for equality.

**Pros and Cons:**

1. **Lodash's _.isEqual**:
	* Pros:
		+ Efficient and optimized for deep object comparison.
		+ Handles complex data structures, such as nested arrays and objects.
		+ Easy to use and understand.
	* Cons:
		+ Requires an additional library (Lodash) to be included in the test environment.
2. **JSON.stringify + Comparison**:
	* Pros:
		+ Lightweight and doesn't require any external libraries.
		+ Fast and simple implementation.
	* Cons:
		+ May not work correctly for complex data structures or custom objects.
		+ Can produce false positives or negatives due to differences in string representation.

**Library:**
The `JSON.stringify` method is a built-in JavaScript function that converts an object into a JSON string. It's used to compare the string representations of two objects.

**Special JS Feature/Syntax:**
None mentioned explicitly, but note that Lodash's _.isEqual uses internal optimizations and custom comparisons for specific data types (e.g., dates, regular expressions).

**Other Alternatives:**

* **Recursion**: You can implement a recursive function to compare two objects. This approach would work similarly to `JSON.stringify + Comparison`, but with more overhead due to the repeated calls.
* **Object Prototypal Inheritance**: Another alternative is to use object prototypal inheritance to create a custom comparison function that traverses both objects simultaneously, comparing their properties recursively.

**Benchmark Preparation:**
The benchmark preparation code sets up two test objects, `window.foo` and `window.bar`, which are used as inputs for the test cases. The Lodash library is included in the HTML document using a CDN link.

Overall, this benchmark provides a fair comparison between two approaches to equality checking on deep objects, allowing users to evaluate performance trade-offs and choose the best approach for their specific use case.

Related benchmarks:

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

Test on isEqual performance

Comparing performance of: _.isEqual vs JSON.stringify

Created: 5 years ago by: Guest

Jump to the latest result

_.isEqual

JSON.stringify

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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