Benchmark: Lodash.isEqual vs JSON.stringify Equality Comparison for Object

HTML Preparation code:

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

Script Preparation code:

window.foo1 = {a: 1, b: {a: 1, b:2, c: [1, 2, 3, [1, 3], {a: 1}]}};
window.foo2 = {a: 1, b: {a: 1, b:2, c: [1, 2, 3, [1, 3], {a: 1}]}, x: ''};
window.foo3 = {a: 0, b: {a: 1, b:2, c: [1, 2, 3, [1, 3], {a: 1}]}};
window.foo4 = {a: 1, b: {a: 1, b:2, c: [2, 3, [1, 3], {a: 1}]}};
window.bar = {a: 1, b: {a: 1, b:2, c: [1, 2, 3, [1, 3], {a: 1}]}};

Tests:

_.isEqual full
_.isEqual(window.foo1, window.bar)
JSON.stringify
JSON.stringify(window.foo1) === JSON.stringify(window.bar);
_.isEqual parted 1
_.isEqual(window.foo2, window.bar)
_.isEqual parted 2
_.isEqual(window.foo3, window.bar)
_.isEqual parted 3
_.isEqual(window.foo4, window.bar)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEqual full
JSON.stringify
_.isEqual parted 1
_.isEqual parted 2
_.isEqual parted 3

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents a benchmark test created on MeasureThat.net, which compares the performance of `Lodash.isEqual` with a simple string comparison using `JSON.stringify`. Here's what's being tested:

**Test cases:**

1. `_isEqual full`: Tests if `_.isEqual` returns true for both objects, `foo1` and `bar`.
2. `_isEqual parted 1`: Tests if `_.isEqual` returns true for the first object part (only `a` property) of `foo1` and `bar`. Note that this is a partial comparison.
3. `_isEqual parted 2`: Tests if `_.isEqual` returns true for the second object part (only `b` property) of `foo1` and `bar`.
4. `_isEqual parted 3`: Tests if `_.isEqual` returns true for a modified version of `foo1` with an extra property (`x`) that's empty.
5. `JSON.stringify`: Tests if a simple string comparison using `JSON.stringify` can determine whether two objects are equal.

**Library:**

The `Lodash.isEqual` function is part of the Lodash library, which provides various utility functions for functional programming, data manipulation, and more. In this case, `isEqual` checks whether two values are strictly equal.

**Pros and Cons:**

* **Lodash.isEqual**: Pros:
	+ Handles nested objects and arrays.
	+ Can be used to compare entire objects or only specific parts of them.
	+ Provides a convenient way to perform equality checks in functional programming.
* Cons:
	+ May have performance overhead due to its recursive nature.
* `JSON.stringify`: Pros:
	+ Fast and lightweight.
	+ Can handle primitive types, nested objects, and arrays.
	+ Simple to implement.
* Cons:
	+ Not designed for deep object comparisons; can lead to incorrect results if objects have different prototype chains.

**Other considerations:**

* The test uses Firefox 105 as the browser, which may not be representative of other browsers' performance.
* The `foo1` and `bar` objects are carefully crafted to ensure that the `_isEqual full`, `_isEqual parted 1`, `_isEqual parted 2`, and `_isEqual parted 3` test cases cover different scenarios.
* The `JSON.stringify` test case is straightforward but might not be as efficient for large objects.

**Alternatives:**

For object comparisons, you can use other libraries like:

* `DeepEqual` from `deep-equal`
* `Object.is()` (if supported by your target browsers)
* Custom implementation using recursion or iteration

For string comparison, you can also consider:

* Using a dedicated library like `fast-json-stamp` for efficient string comparison
* Implementing a simple string comparison algorithm using techniques like prefix matching or suffix matching

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:105.0) Gecko/20100101 Firefox/105.0

Browser/OS: Firefox 105 on Windows

View result in a separate tab

Test name	Executions per second
_.isEqual full	289631.4 Ops/sec
JSON.stringify	531783.5 Ops/sec
_.isEqual parted 1	1281525.9 Ops/sec
_.isEqual parted 2	921811.4 Ops/sec
_.isEqual parted 3	493310.8 Ops/sec

Related benchmarks:

Lodash.isEqual vs JSON.stringify Equality Comparison for Object (version: 0)

Test on isEqual performance

Comparing performance of: _.isEqual full vs JSON.stringify vs _.isEqual parted 1 vs _.isEqual parted 2 vs _.isEqual parted 3

Created: 4 years ago by: Guest

Jump to the latest result

_.isEqual full

JSON.stringify

_.isEqual parted 1

_.isEqual parted 2

_.isEqual parted 3

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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