Benchmark: Lodash.isEqual vs Lodash.isEqualWith 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)
_.isEqualShallow
_.isEqualWith(window.foo, window.bar, (a, b) => a===b)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual
_.isEqualShallow

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
_.isEqual	10688648.0 Ops/sec
_.isEqualShallow	99414024.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark test case created using MeasureThat.net. The test aims to compare the performance of two functions: `lodash.isEqual` and `lodash.isEqualWith`, which are both used for equality comparisons.

**Options compared**

The two options being compared are:

1. **_lodash.isEqual**: This function checks if two values are deeply equal, meaning it recursively compares the structure and contents of the values.
2. **_lodash.isEqualWith**: This function is similar to `_.isEqual`, but it allows for a custom equality comparison function to be passed as an argument.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **_.isEqual (Deep Equality Comparison)**:
	* Pros: Provides the most accurate result, especially when comparing complex data structures like arrays or objects.
	* Cons: Can be slower than shallow comparisons due to its recursive nature.
2. **_.isEqualWith (Custom Equality Comparison)**:
	* Pros: Offers more flexibility and control over the comparison process, which can lead to better performance for specific use cases.
	* Cons: Requires manual implementation of a custom equality comparison function, which can add complexity and potentially introduce bugs.

**Other Considerations**

In general, when choosing between deep and shallow comparisons, consider the following:

* For simple data structures like strings or numbers, shallow comparisons (like _.isEqual) are usually sufficient.
* For complex data structures like arrays or objects, deep comparisons (like _.isEqual) may be necessary to ensure accuracy.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for tasks like array manipulation, string trimming, and equality comparisons. In this case, the `lodash` module is included in the benchmark HTML code using `<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>`, making its functions available to the test.

**Special JS Feature or Syntax (Not applicable)**

There are no special JavaScript features or syntax mentioned in this benchmark that would require additional explanation.

**Alternatives**

If you're interested in exploring alternative libraries for equality comparisons, some popular options include:

* **Loose Equality with Strict Equality**: Using `===` instead of a comparison function like `_.isEqualWith`.
* **Using Built-in Functions**: Utilizing built-in JavaScript functions like `Object.keys()` or `Array.prototype.every()` to compare objects and arrays.
* **Alternative Libraries**: Other libraries like Jest, Enzyme, or TypeScript's built-in type checking can also provide equality comparisons.

Keep in mind that each alternative has its pros and cons, and the choice ultimately depends on your specific use case and performance requirements.

Related benchmarks:

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

Test on isEqual performance

Comparing performance of: _.isEqual vs _.isEqualShallow

Created: 2 years ago by: Guest

Jump to the latest result

_.isEqual

_.isEqualShallow

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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