Benchmark: Deep object equal

HTML Preparation code:

<script>
const equal = (a, b) => {
  if (a === b || isNaN(a) === isNaN(b)) return true;
  if (a && b && typeof a === 'function' && typeof b === 'function') {
    return a.toString() === b.toString();
  }
  if (a && b && typeof a === 'object' && typeof b === 'object') {
    if (a.constructor !== b.constructor) return false;
    let length, index;
    if (Array.isArray(a)) {
      length = a.length;
      if (length !== b.length) return false;
      index = length;
      while (index--) {
        if (!equal(a[index], b[index])) return false;
      }
      return true;
    }
    const keys = Object.keys(a);
    length = keys.length;
    if (length !== Object.keys(b).length) return false;
    index = length;
    while (index--) {
      if (!Object.prototype.hasOwnProperty.call(b, keys[index])) return false;
    }
    index = length;
    while (index--) {
      const key = keys[index];
      if (!equal(a[key], b[key])) return false;
    }
    return true;
  }
  return false;
};
</script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Tests:

Deep equal
const a = { a: 123, b: true, c: () => console.log('test'), d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; const b = { a: 123, b: true, c: () => console.log('test'), d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; equal(a, b);
Lodash isEqual
const a = { a: 123, b: true, c: () => console.log('test'), d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; const b = { a: 123, b: true, c: () => console.log('test'), d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; _.isEqual(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Deep equal
Lodash isEqual

Fastest: N/A

Slowest: N/A

Latest 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 provided benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Definition**
The provided JSON represents a JavaScript benchmark for testing object equality between two deeply nested objects.

**Script Preparation Code**
The script preparation code is null, which means that no additional setup or initialization is required before running the benchmark.

**Html Preparation Code**
The HTML preparation code includes two `<script>` tags:

1. The first tag loads the `lodash.js` library from a CDN, which provides the `_` alias for accessing its functions.
2. The second tag defines a simple JavaScript function `equal(a, b)` that checks if two objects are deeply equal. This function is used to compare the test cases.

**Individual Test Cases**
There are two test cases:

1. **Deep equal**: This test case compares two identical objects `a` and `b`.
2. **Lodash isEqual**: This test case uses the `_` alias from the loaded Lodash library to call its `isEqual(a, b)` function, which also checks for deep object equality.

**Comparison**
The benchmark tests two approaches:

1. **Custom implementation (equal function)**: The `equal` function is defined in the HTML preparation code and is used to compare objects directly.
2. **Lodash isEqual**: The `_` alias from Lodash is used to call its `isEqual(a, b)` function, which also checks for deep object equality.

**Pros/Cons of each approach**

1. **Custom implementation (equal function)**:
	* Pros: Simple, lightweight, and self-contained.
	* Cons: May not be as efficient or comprehensive as a dedicated library like Lodash.
2. **Lodash isEqual**:
	* Pros: Well-tested, efficient, and provides additional features beyond simple object equality (e.g., handling arrays and functions).
	* Cons: Requires loading the Lodash library, which adds overhead.

**Other considerations**

1. **Special JS feature or syntax**: None mentioned in this benchmark.
2. **Library usage**: Lodash is used for its `isEqual` function.
3. **Device platform**: The benchmark runs on a Linux desktop environment with Chrome 96 browser.

**Alternatives**
If you need to test object equality, consider the following alternatives:

1. **Built-in JavaScript methods**: Use built-in methods like `Object.is()` (available in modern browsers) or create your own implementation using recursion and shallow/descent comparison.
2. **Other libraries**: Depending on your specific needs, other libraries like `lodash` or `immer` might provide more features or efficiency for object equality checks.

Keep in mind that the choice of implementation depends on your project's requirements, performance constraints, and personal preference.

Related benchmarks:

Deep object equal (version: 0)

Compares deeply two objects

Comparing performance of: Deep equal vs Lodash isEqual

Created: 4 years ago by: Registered User

Jump to the latest result

Deep equal

Lodash isEqual

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):