Benchmark: Object Array Equality (Map-JSON.stringify + sort vs Multiple Loops)) Fixed

Script Preparation code:

var objArr1 = [{
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5,
}]
var objArr2 = [{
  e: 5,
  b: 2,
  a: 1,
  d: 4,
  c: 3,
}]
function mapStringifySort($objArr1, $objArr2) {
  $objArr1 = $objArr1.map(obj=>JSON.stringify(obj)).sort()
  $objArr2 = $objArr2.map(obj=>JSON.stringify(obj)).sort()
  for (let i=0; i<$objArr1.length; i++){
    if($objArr1[i]!==$objArr2[i]) return false
  }
  return true
}
function multipleLoops($objArr1, $objArr2) {
  const has = Object.prototype.hasOwnProperty
  return $objArr1.every(($obj1)=>{
    let $obj1Len = Object.keys($obj1).length
    return $objArr2.some(($obj2)=>{
      for(let key in $obj1) {
        if($obj2[key]!==$obj1[key]) {
          return false
        }
        if(!has.call($obj2,key)) {
          return false
        }
      }
      return $obj1Len===Object.keys($obj2).length
    })
  })
}

Tests:

Map-JSON.stringify + Sort
for(let i=0; i<10000; i++) { console.log(mapStringifySort(objArr1,objArr2)) }
Multiple Loops
for(let i=0; i<10000; i++) { console.log(multipleLoops(objArr1,objArr2)) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map-JSON.stringify + Sort
Multiple Loops

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 120 on Android

View result in a separate tab

Test name	Executions per second
Map-JSON.stringify + Sort	3.7 Ops/sec
Multiple Loops	4.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript benchmark test case on MeasureThat.net, which compares the performance of two approaches to check for object array equality: `Map-JSON.stringify + sort` and `Multiple Loops`.

**Options Compared**

Two options are compared:

1. **Map-JSON.stringify + sort**: This approach uses the `map()` function to convert each object in both arrays to a string using `JSON.stringify()`, followed by sorting the resulting arrays. The equality of objects is then checked by comparing the sorted strings.
2. **Multiple Loops**: This approach uses two loops: an outer loop that iterates over the length of the first array, and an inner loop that checks each key in the first object against every key in the second object using `Object.keys()` and `hasOwnProperty()`. If a mismatch is found, the function returns false.

**Pros and Cons**

* **Map-JSON.stringify + sort**:
	+ Pros: efficient use of built-in `map()` and `sort()` functions, reduces number of comparisons.
	+ Cons: may not work correctly for objects with non-standard string representations or custom equality checks.
* **Multiple Loops**:
	+ Pros: can handle complex object structures, custom equality checks, and provides more detailed information about mismatches.
	+ Cons: slower due to the two loops and multiple comparisons.

**Library Used**

None explicitly mentioned in the provided code. However, `JSON.stringify()` is a built-in JavaScript function.

**Special JS Feature or Syntax**

The test uses the `for...of` loop (not explicitly shown) which is a feature introduced in ECMAScript 2015 (ES6). This loop allows iterating over iterable objects like arrays and iterables.

**Other Considerations**

* Both approaches assume that objects with missing properties are equal to `null`.
* The test case does not handle cases where objects have different lengths or structures.
* The number of executions per second is reported, which can be useful for comparing performance between browsers and devices.

**Alternatives**

Other alternatives for object array equality checks include:

* Using a library like Lodash's `isEqual()` function
* Implementing a custom equality check using bitwise operations (e.g., `===` with `Object.keys()`)
* Using a data structure like a trie or a prefix tree to efficiently compare objects.

Related benchmarks:

Object Array Equality (Map-JSON.stringify + sort vs Multiple Loops)) Fixed (version: 0)

Comparing performance of: Map-JSON.stringify + Sort vs Multiple Loops

Created: 2 years ago by: Guest

Jump to the latest result

Map-JSON.stringify + Sort

Multiple Loops

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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