Benchmark: Lodash.isEqual vs JSON.stringify

HTML Preparation code:

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

Script Preparation code:

window.foo = ['cat', 'dog', 'bird'];
window.bar = ['cat', 'dog', 'bird'];
window.stringBar = JSON.stringify(window.bar);

Tests:

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

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):

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

**Benchmark Overview**

The benchmark compares two approaches for testing equality between two arrays: Lodash's `isEqual` function and JSON string comparison using `JSON.stringify`.

**Test Cases**

There are two test cases:

1. **Lodash's `isEqual` function**: This test case creates two identical arrays, `window.foo`, and tests if Lodash's `isEqual` function returns `true`.
2. **JSON string comparison**: This test case creates an array `window.foo`, converts it to a JSON string using `JSON.stringify`, and then compares the resulting string with another identical array stored in `window.stringBar`. The goal is to see if the two values are equal.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for tasks such as array manipulation, object transformation, and functional programming. In this case, Lodash's `isEqual` function is used to compare arrays.

Pros of using Lodash:

* Highly optimized and efficient implementation
* Wide range of supported data types (arrays, objects, numbers, etc.)
* Can handle complex equality checks with support for partial matches

Cons of using Lodash:

* Additional dependency on the library
* May have a slight performance overhead due to the function call
* Not as lightweight as native JavaScript implementations

**JSON String Comparison**

The JSON string comparison test case uses the fact that in most programming languages, including JavaScript, two identical values are considered equal if and only if their string representations are equal. By converting an array to a JSON string using `JSON.stringify`, we can compare it with another value.

Pros of JSON string comparison:

* No additional dependency on a library
* Extremely lightweight implementation (just a simple function call)
* Wide range of supported data types

Cons of JSON string comparison:

* May have performance issues if the arrays are very large, as `JSON.stringify` can be slow for big objects.
* Does not handle certain edge cases like NaN or undefined values.

**Other Considerations**

When comparing array equality using Lodash's `isEqual` function, keep in mind that it also checks for:

* Array length
* Element order
* Presence of null or undefined elements

If you only care about the presence and value of elements, you can use the `$eq` function from Lodash.

For JSON string comparison, be aware that this approach may not work correctly if the arrays contain non-JSON data types (e.g., objects with circular references).

**Other Alternatives**

If you need to compare arrays efficiently without using a library like Lodash:

1. **Native JavaScript implementation**: You can write your own array equality function using bitwise operations and comparisons.
2. **Google's `arrays-equal` function**: A lightweight and efficient alternative to Lodash's `isEqual`.
3. **Other libraries or frameworks**: Depending on the specific requirements, you might consider other libraries like Jest, Mocha, or other testing frameworks that offer array comparison utilities.

Keep in mind that these alternatives may not be as widely supported or optimized as Lodash's implementation.

Related benchmarks:

Lodash.isEqual vs JSON.stringify (version: 0)

Comparing performance of: _.isEqual vs JSON.stringify

Created: 4 years ago by: Registered User

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):