Benchmark: Deep object equalA and equalB

HTML Preparation code:

<script>
const equalA = (a, b) => {
  if (a === b) return true;
  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 (!equalA(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--) {
      const key = keys[index];
      if (!equalA(a[key], b[key])) return false;
    }
    return true;
  }
  return false;
};
  
const equalB = (a, b) => {
  if (a === b) return true;
  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 (!equalB(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 (!equalB(a[keys[index]], b[keys[index]])) return false;
    }
    return true;
  }
  return false;
};  
</script>

Tests:

Deep equalA
const a = { a: 123, b: true, c: 'abcd', d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; const b = { a: 123, b: true, c: 'abcd', d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; equalA(a, b);
Deep equalB
const a = { a: 123, b: true, c: 'abcd', d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; const b = { a: 123, b: true, c: 'abcd', d: [ 1, 2, 3, { t: 'test', k: [{}, [9, 8, 7], {} ] }, [], {}, { a: 'text', b: false } ] }; equalB(a, b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Deep equalA
Deep equalB

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its various components.

**Benchmark Definition**

The benchmark measures the performance of two identical functions, `equalA` and `equalB`, which compare deeply two objects. The object comparison function is called recursively to check for nested properties and arrays.

**Options Compared**

There are two variants of the object comparison function:

1. `equalA`
2. `equalB`

The main difference between these two functions lies in how they iterate through the object's properties and arrays:

* `equalA` uses a single variable, `index`, to iterate through both objects at the same time.
* `equalB` uses a separate array to store indices of equal elements.

**Pros and Cons**

1. **Single iteration**: `equalA` only iterates through the objects once, which may be more efficient in terms of memory usage and cache locality. However, it also introduces additional overhead due to accessing multiple variables simultaneously.
2. **Parallel iteration**: `equalB` uses a separate array to store indices of equal elements, which can lead to better parallelization and potentially faster execution times. However, this approach may result in increased memory usage and decreased cache efficiency.

**Library**

There is no explicitly mentioned library in the benchmark definition or test cases. However, both functions use built-in JavaScript features, such as `Object.keys()`, arrays, and recursion, which are part of the standard language.

**Special JS Features/Syntax**

The benchmark uses recursive function calls to compare objects, which is a common pattern in JavaScript. The `typeof` operator is used to check the type of variables, and the `Array.isArray()` function is used to detect arrays.

**Other Alternatives**

Some alternative approaches could be considered:

1. **Iterating through object properties using for...in**: Instead of using `Object.keys()`, you could use a traditional `for...in` loop to iterate through an object's properties.
2. **Using a dedicated library**: There are libraries like Lodash or Ramda that provide optimized functions for comparing objects and arrays.
3. **Using SIMD instructions**: If the benchmark is running on a device with SIMD (Single Instruction, Multiple Data) capabilities, you could use intrinsics to perform operations on multiple elements simultaneously.

Keep in mind that these alternatives might not be suitable for this specific benchmark, as they may introduce additional overhead or change the behavior of the code.

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/96.0.4664.45 Safari/537.36

Browser/OS: Chrome 96 on Linux

View result in a separate tab

Test name	Executions per second
Deep equalA	324918.4 Ops/sec
Deep equalB	355678.3 Ops/sec

Related benchmarks:

Deep object equalA and equalB (version: 0)

Compares deeply two objects

Comparing performance of: Deep equalA vs Deep equalB

Created: 2 years ago by: Guest

Jump to the latest result

Deep equalA

Deep equalB

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):