Benchmark: Lodash 4.17.21 isEqual vs JSON.stringify

Lodash 4.17.21 isEqual vs JSON.stringify (version: 0)

Comparing performance of: Lodash with same object vs Lodash with equal objects vs Lodash with different objects vs Lodash with different types vs JSON.stringify with same object vs JSON.stringify with equal objects vs JSON.stringify with different objects vs JSON.stringify with different types

Created: 2 years ago by: Guest

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HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js'></script>

Script Preparation code:

var MyObject = {
  description: 'This is an object',
  myNumber: 123456789,
  myBoolean: true,
  json: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var MyObjectCopy = {
  description: 'This is an object',
  myNumber: 123456789,
  myBoolean: true,
  json: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var MyObject2 = {
  description: 'This is a different object',
};

var MyObject3 = ["This", "is", "an", "array"]

Tests:

Lodash with same object
_.isEqual(MyObject, MyObject);
Lodash with equal objects
_.isEqual(MyObject, MyObjectCopy);
Lodash with different objects
_.isEqual(MyObject, MyObject2);
Lodash with different types
_.isEqual(MyObject, MyObject3);
JSON.stringify with same object
JSON.stringify(MyObject) === JSON.stringify(MyObject)
JSON.stringify with equal objects
JSON.stringify(MyObject) === JSON.stringify(MyObjectCopy)
JSON.stringify with different objects
JSON.stringify(MyObject) === JSON.stringify(MyObject2)
JSON.stringify with different types
JSON.stringify(MyObject) === JSON.stringify(MyObject3)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash with same object
Lodash with equal objects
Lodash with different objects
Lodash with different types
JSON.stringify with same object
JSON.stringify with equal objects
JSON.stringify with different objects
JSON.stringify with different types

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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I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark is designed to compare the performance of Lodash's `isEqual` function with JSON stringification. The script creates three objects: `MyObject`, `MyObjectCopy`, and `MyObject2`. The `MyObject` object has nested properties, including a `json` property that contains two strings.

**Test Cases**

There are six test cases:

1. **Lodash with same object**: This test case checks if Lodash's `isEqual` function returns true for an object compared to the same object.
2. **Lodash with equal objects**: This test case checks if Lodash's `isEqual` function returns true for two identical objects.
3. **Lodash with different objects**: This test case checks if Lodash's `isEqual` function returns false for a non-identical object.
4. **Lodash with different types**: This test case checks if Lodash's `isEqual` function correctly handles objects with different property types (e.g., numbers, booleans).
5. **JSON.stringify with same object**: This test case checks if JSON stringification returns the same result for an object compared to itself.
6. **JSON.stringify with equal objects**: This test case checks if JSON stringification returns the same result for two identical objects.

**Comparison and Pro/Cons**

The comparison is between Lodash's `isEqual` function and JSON stringification. Here are some pros and cons of each approach:

* **Lodash's `isEqual` function**:
	+ Pros: Handles nested objects, correctly identifies equal objects with different properties.
	+ Cons: May be slower due to the complexity of its algorithm.
* **JSON stringification**:
	+ Pros: Fast and simple, can be used for basic equality checks.
	+ Cons: Ignores object property types, may not work correctly for nested objects or cyclic references.

**Conclusion**

The benchmark highlights the differences in performance and functionality between Lodash's `isEqual` function and JSON stringification. While JSON stringification is fast and simple, it has limitations when it comes to handling complex object structures. Lodash's `isEqual` function provides a more robust solution but may come at the cost of slightly slower performance.

In general, if you need a simple equality check for basic objects, JSON stringification might be sufficient. However, if you're working with complex object structures or require a more precise comparison, Lodash's `isEqual` function is likely a better choice.

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