Benchmark: Compare Two Objects

HTML Preparation code:

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

Script Preparation code:

window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

window.isObject = (object) => {
  return object != null && typeof object === "object";
};

window.isDeepEqual = (object1, object2) => {

  const objKeys1 = Object.keys(object1);
  const objKeys2 = Object.keys(object2);

  if (objKeys1.length !== objKeys2.length) return false;

  for (var key of objKeys1) {
    const value1 = object1[key];
    const value2 = object2[key];

    const isObjects = window.isObject(value1) &&  window.isObject(value2);

    if ((isObjects && !isDeepEqual(value1, value2)) ||
      (!isObjects && value1 !== value2)
    ) {
      return false;
    }
  }
  return true;
};

Tests:

Lodash Equal:
_.isEqual(window.foo3, window.bar3)
Manual Equal:
isDeepEqual(window.foo3, window.bar3);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash Equal:
Manual Equal:

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared, and considered.

**Benchmark Definition**

The provided JSON represents a JavaScript benchmark that compares two objects: `window.foo3` and `window.bar3`. The objective is to determine if these two objects are equal or not.

**Script Preparation Code**

This code defines two objects:

* `foo3`: an object with nested properties (`a`, `b`, and `c`) that contain identical values.
* `bar3`: another object with similar structure, but with a modified value in the `c` property (from `{...}` to `{a: 1, b: 4}`).

**Html Preparation Code**

This line includes an external library, Lodash (version 4.17.4), which provides utility functions for working with JavaScript objects.

**Test Cases**

There are two test cases:

1. **Lodash Equal**: The benchmark calls the `_.isEqual` function from Lodash to compare `foo3` and `bar3`. This function is designed to recursively check if two values are deeply equal.
2. **Manual Equal**: Another test case that manually implements a similar recursive equality check using the `isDeepEqual` function defined in the script preparation code.

**Comparison**

The two approaches are compared to determine which one is faster:

* Lodash's `_.isEqual` uses a optimized implementation of recursion and memoization to compare values efficiently.
* The manual approach relies on a simple recursive function with no optimizations, making it potentially slower than the Lodash version.

**Pros and Cons**

**Lodash Equal:**

Pros:

* Optimized for performance
* Handles complex data structures (e.g., nested objects)
* Provides a consistent and predictable result

Cons:

* Requires an external library
* May introduce additional dependencies

Manual Equal:

Pros:

* No external dependencies required
* Simple to understand and implement

Cons:

* May be slower due to the lack of optimizations
* More prone to errors and inconsistencies

**Other Considerations**

The benchmark also considers other factors, such as:

* **DevicePlatform**: The test is run on a desktop device with Chrome 106. This could affect the results, especially if the benchmark were to be run on mobile devices or different browsers.
* **OperatingSystem**: The test runs on Windows. Other operating systems might behave differently.

**Alternative Approaches**

Other alternatives for implementing deep equality checks include:

* Using the `JSON.stringify()` method and comparing the resulting strings (not as efficient as Lodash's implementation)
* Implementing a custom recursive function with manual memoization
* Using a library like jQuery or React that provides built-in equality check functionality

Keep in mind that each approach has its trade-offs, and the choice of implementation depends on the specific requirements and constraints of the project.

Related benchmarks:

Compare Two Objects (version: 0)

Comparing performance of: Lodash Equal: vs Manual Equal:

Created: 3 years ago by: Guest

Jump to the latest result

Lodash Equal: