Benchmark: Test on isEqual performance with array of objects and customiser

HTML Preparation code:

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

Script Preparation code:

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

Tests:

isEqual
_.isEqual(window.foo, window.bar, (a, b) => a.id === b.id)
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
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 dive into the explanation of the provided benchmark.

**Overview**

The benchmark is designed to measure the performance of two different approaches for comparing arrays of objects: using the `lodash` library and a custom comparison function. The benchmark defines two test cases:

1. "Stringify": This test case compares two arrays of objects by converting them to strings using `JSON.stringify()`.
2. "isEqual": This test case uses the `lodash` library's `isEqual()` function to compare the same two arrays.

**Options compared**

The two options being compared are:

* **Custom comparison function**: A simple function that checks if two properties (`id`) have the same value.
* **Lodash `isEqual()` function**: A built-in function from the `lodash` library that compares two values recursively, considering data types and structures.

**Pros and Cons**

1. **Custom comparison function**:
	* Pros: Simple to implement, straightforward to understand, and can be optimized for specific use cases.
	* Cons: May not work correctly for all data types or edge cases, such as nested objects or arrays with different lengths.
2. **Lodash `isEqual()` function**:
	* Pros: Robust implementation that handles various data types and structures, provides a simple API, and is widely used in the JavaScript community.
	* Cons: May be slower due to its recursive nature and additional overhead from the library.

**Library usage**

The benchmark uses the `lodash` library version 4.17.4. Lodash is a popular utility library that provides various functions for tasks like array manipulation, object inspection, and string manipulation.

In this specific benchmark, the `isEqual()` function is used to compare two arrays of objects recursively, considering properties (`id`) with the same name.

**Special JS feature or syntax**

There are no special JavaScript features or syntaxes mentioned in the benchmark. The code uses standard JavaScript syntax and doesn't rely on any experimental or proposal-based features.

**Other alternatives**

If you were to implement a custom comparison function without using Lodash, you could consider using techniques like:

* Iterating through each property of the objects being compared
* Using a library like `fast-json-stamp` for stringification and comparison

Keep in mind that these alternatives might not be as efficient or robust as the `lodash` implementation.

Overall, the benchmark provides a clear example of how to measure performance differences between simple custom implementations and a widely-used library like Lodash.

Related benchmarks:

Test on isEqual performance with array of objects and customiser (version: 0)

Comparing performance of: isEqual vs Stringify

Created: 7 years ago by: Guest

Jump to the latest result

isEqual

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):