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

HTML Preparation code:

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

Script Preparation code:

window.foo = {
    name: "Michael",
    age: 36,
    location: {
        state: "OK",
        city: "Edmond",
        postal: "73012"
    },
    relatives: {
        wife: {
            name: "Shelley"
        }
    }
};
window.bar = {
    name: "Michael",
    age: 36,
    location: {
        state: "OK",
        city: "Edmond",
        postal: "73012"
    },
    relatives: {
        wife: {
            name: "Shelley"
        }
    }
};

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:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.133 Safari/537.36

Browser/OS: Chrome 100 on Linux

View result in a separate tab

Test name	Executions per second
_.isEqual	75393.3 Ops/sec
JSON.stringify	102059.9 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is designed to compare the performance of two approaches: using Lodash's `isEqual` function versus comparing JSON strings using the `===` operator.

**Script Preparation Code**

The script defines two objects, `window.foo` and `window.bar`, which are identical except for a nested object property. The `foo` object has an additional key-value pair in the `relatives` object: `wife.name = "Shelley"`. This setup creates a medium-depth object hierarchy with some variations.

**Html Preparation Code**

The HTML includes a reference to the Lodash library, which is used by the `isEqual` function.

**Individual Test Cases**

There are two test cases:

1. **_.isEqual(window.foo, window.bar)**: This test case measures the performance of using Lodash's `isEqual` function to compare the two objects.
2. **JSON.stringify(window.foo) === JSON.stringify(window.bar)**: This test case measures the performance of comparing the two objects by converting them to JSON strings and checking for equality.

**Pros and Cons**

* **_.isEqual**: Pros:
	+ More robust comparison, as it can handle circular references and nested objects.
	+ Fewer operations required, as it uses a optimized internal implementation.
* Cons:
	+ May be slower due to the overhead of the Lodash library and its implementation.
	+ May not perform well on very large objects or complex data structures.
* **JSON.stringify**: Pros:
	+ Fast and lightweight, as it only converts the object to a string representation.
	+ Can handle simple cases quickly.
* Cons:
	+ May fail for circular references or complex data structures.
	+ Requires converting the object to a string, which can be slower than directly comparing objects.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a set of functions for common tasks, such as array manipulation, string manipulation, and object comparison. The `isEqual` function is part of this library and uses a combination of internal implementation details to optimize the comparison process.

**Special JS Feature/Syntax: None mentioned in the benchmark**

If you're interested in learning more about other JavaScript features or syntax, I can provide information on various aspects of the language.

**Other Alternatives**

If you want to compare the performance of these approaches without using Lodash, you could use alternative libraries like:

* **JSON Schema**: for validating JSON data and comparing its structure.
* **Array.prototype.every()** or **Array.prototype.some()**: for checking if all or any elements in an array match a condition.

Keep in mind that the performance difference between these approaches may not be significant, as they have different use cases and design goals.

Related benchmarks:

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

Test on isEqual performance medium deep object

Comparing performance of: _.isEqual vs JSON.stringify

Created: 2 years ago by: Guest

Jump to the latest result

_.isEqual

JSON.stringify

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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