Benchmark: Lodash.isEqual vs JSON.stringify Equality Comparison for Shallow Array of Dates.

HTML Preparation code:

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

Script Preparation code:

window.foo = [new Date(), new Date(), new Date(), new Date(), new Date()];
window.bar = [new Date(), new Date(), new Date(), new Date()];

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):

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Let's break down the provided JSON and explain what's being tested, compared, and discussed.

**Benchmark Definition**

The benchmark is focused on comparing two approaches to check for equality between two shallow arrays of dates: using Lodash's `isEqual` function versus checking for equality by converting the arrays to strings using `JSON.stringify`.

**Script Preparation Code**

The script preparation code sets up two variables, `foo` and `bar`, which are arrays of five new Date objects. These arrays are used as inputs for the benchmark tests.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library version 4.17.4 from a CDN. This library is used by the benchmark test to execute the `isEqual` function.

**Individual Test Cases**

There are two test cases:

1. **_.isEqual(window.foo, window.bar)**: This test case uses Lodash's `isEqual` function to compare the `foo` and `bar` arrays. The `isEqual` function is designed to recursively check for equality between two objects or arrays, including nested properties.
2. **JSON.stringify(window.foo) === JSON.stringify(window.bar)**: This test case compares the string representations of the `foo` and `bar` arrays using `JSON.stringify`. This approach checks if the arrays have the same elements in the same order.

**Comparison**

The benchmark is designed to compare the performance of these two approaches:

* **Lodash's isEqual**: This approach uses a deep equality comparison, which can be slower due to its recursive nature. However, it provides more accurate results, as it checks for all properties and nested objects.
* **JSON.stringify Equality Comparison**: This approach uses a simple string comparison, which is faster but may return false positives if the arrays have different lengths or if there are duplicate elements.

**Pros and Cons**

* **Lodash's isEqual**:
	+ Pros: More accurate results due to its recursive nature.
	+ Cons: Slower performance compared to the string comparison approach.
* **JSON.stringify Equality Comparison**:
	+ Pros: Faster performance compared to Lodash's isEqual.
	+ Cons: May return false positives if arrays have different lengths or duplicate elements.

**Other Considerations**

* The benchmark uses a desktop Chrome browser, which may affect the results. Running the benchmark on other browsers or platforms could yield different performance characteristics.
* The benchmark only checks for shallow array equality and does not consider deep object equality.

**Alternative Approaches**

Some alternative approaches to compare array equality include:

* Using `Array.prototype.every()` or `Array.prototype.some()` with a callback function that checks for equality between elements.
* Implementing a custom comparison function using bitwise operations, such as comparing element values and lengths.
* Using a library like `deep-equal` instead of Lodash's `isEqual`.

Related benchmarks:

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

Test on isEqual performance

Comparing performance of: _.isEqual vs JSON.stringify

Created: 4 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):