Benchmark: Lodash.isEqual vs Array.join() vs JSON.stringify Equality Comparison for Shallow Array of Strings.

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'];

Tests:

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
_.isEqual	2019308.9 Ops/sec
Array.join()	2478474.0 Ops/sec
JSON.stringify	1340998.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the provided benchmark test.

**Overview**

The provided JSON represents a benchmark test on JavaScript, specifically comparing three approaches for equality comparison: Lodash's `isEqual` function, Array `join()` method, and `JSON.stringify`. The test is designed to measure which approach performs better in terms of speed.

**Benchmark Definition**

The benchmark definition is a set of scripts that are run by the test. It consists of:

1. A script preparation code that sets up two variables: `window.foo` and `window.bar`, both containing an array of strings (`['cat', 'dog', 'bird']`).
2. An HTML preparation code that includes a script tag to load the Lodash library version 4.17.4.

**Individual Test Cases**

The benchmark test consists of three individual test cases:

1. **_.isEqual(window.foo, window.bar)**: This test case uses Lodash's `isEqual` function to compare the two arrays.
2. **window.foo.join() === window.bar.join()**: This test case uses the Array `join()` method to concatenate the strings in both arrays and then compares the resulting strings.
3. **JSON.stringify(window.foo) === JSON.stringify(window.bar)**: This test case converts both arrays to JSON strings using `JSON.stringify` and then compares the resulting strings.

**Options Compared**

The three test cases are compared in terms of their performance, measured by the number of executions per second.

**Pros and Cons of Each Approach**

1. **Lodash's isEqual function**:
	* Pros: Efficient and optimized for equality comparison.
	* Cons: Requires an external library (Lodash).
2. **Array join() method**:
	* Pros: Simple and straightforward implementation, no external libraries required.
	* Cons: May be slower than `isEqual` due to string concatenation overhead.
3. **JSON.stringify**:
	* Pros: Fast and efficient way to convert arrays to strings.
	* Cons: May not be suitable for all use cases (e.g., nested objects), and may not preserve the original array structure.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for tasks such as string manipulation, array manipulation, and object manipulation. The `isEqual` function is one of its most commonly used functions, which compares two values (objects or arrays) for equality.

**Special JS Feature/Syntax**

None mentioned in the provided benchmark definition.

**Alternatives**

If you need to implement an equality comparison function similar to Lodash's `isEqual`, you can use a recursive approach or a library like `deep-equal` (which is also based on Lodash). Another alternative is using a custom implementation, such as a hash-based comparison algorithm.

Related benchmarks:

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

Test on isEqual performance

Comparing performance of: _.isEqual vs Array.join() vs JSON.stringify

Created: one year ago by: Guest

Jump to the latest result

_.isEqual

Array.join()

JSON.stringify

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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