Benchmark: 10 Objects in a 100 Object Pool; Array find vs Map get

Script Preparation code:

const randomMax = 100000000

const objectPoolSize = 100
const objectsToFind = 10

const getRandomNumber = (max) => {
  return Math.floor(Math.random() * max);
}

class TestObject {
    constructor() {
        this.a = getRandomNumber(randomMax)
        this.b = 'Test String'
    }
}

var map = new Map()
var array = []

for (let i = 0; i < objectPoolSize; i++) {
    const testObject = new TestObject()
    map.set(testObject.a, testObject)
    array.push(testObject)
}

var objectIdsToFind = [];

for (let i = 0; i < objectsToFind; i++) {
  objectIdsToFind.push(array[getRandomNumber(array.length)].a)
}

Tests:

Array.find
for (let i = 0; i < objectIdsToFind.length; i++) { array.find((val) => val.a === objectIdsToFind[i]) }
Map.get
for (let i = 0; i < objectIdsToFind.length; i++) { map.get(objectIdsToFind[i]) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
Map.get

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:127.0) Gecko/20100101 Firefox/127.0

Browser/OS: Firefox 127 on Windows

View result in a separate tab

Map.get

124.5M/s

Array.find

1.7M/s

View exact numbers

Test name	Executions per second
✓ Map.get	124,503,136 Ops/sec
Array.find	1,723,916 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark compares the performance of two approaches: `array.find` versus `map.get`. The goal is to find an element in a pool of 100 objects (represented by the `TestObject` class) using either an array or a map. The pool consists of objects with unique identifiers (`a`) and a string property (`b`).

**Script Preparation Code**

The script preparation code generates:

1. A large number generator (`getRandomNumber`) to create random numbers between 0 and `randomMax`.
2. A `TestObject` class with a constructor that sets the object's properties, including a unique identifier (`a`) and a string property (`b`).
3. An array (`array`) and a map (`map`) initialized with the generated objects.
4. An array of unique identifiers to find (`objectIdsToFind`).

**Individual Test Cases**

There are two test cases:

### Array.find

The `Array.find` test case uses the following code:
```javascript
for (let i = 0; i < objectIdsToFind.length; i++) {
  array.find((val) => val.a === objectIdsToFind[i])
}
```
This code iterates over the `objectIdsToFind` array and for each identifier, it uses the `find` method on the `array` to find an element with a matching `a` property.

### Map.get

The `Map.get` test case uses the following code:
```javascript
for (let i = 0; i < objectIdsToFind.length; i++) {
  map.get(objectIdsToFind[i])
}
```
This code iterates over the `objectIdsToFind` array and for each identifier, it uses the `get` method on the `map` to retrieve an object with a matching `a` property.

**Pros and Cons**

* **Array.find**: Pros:
	+ Efficient for large arrays with unique identifiers.
	+ Can be faster than `Map.get` since it doesn't require extra memory allocation.
* Cons:
	+ May perform slower for smaller arrays or when the array is not sorted.
	+ Requires the element to be found in the array, which may lead to unnecessary computations if the element is not present.
* **Map.get**: Pros:
	+ Efficient for large datasets with unique identifiers, as it uses a hash table for fast lookups.
	+ Reduces memory allocation and garbage collection compared to `Array.find`.
* Cons:
	+ May perform slower for smaller arrays or when the map is not properly indexed.
	+ Requires extra memory allocation for the map.

**Library and Special JS Features**

The benchmark uses the following JavaScript features:

1. Classes (e.g., `TestObject`) using the `class` keyword.
2. Lambda functions (e.g., `(val) => val.a === objectIdsToFind[i]`) in the `Array.find` test case.

These features are part of modern JavaScript and are supported by most browsers.

**Alternatives**

Other alternatives for implementing this benchmark could be:

1. Using a library like Lodash or Ramda, which provide similar functionality to `Array.find` and `Map.get`.
2. Implementing a custom lookup function using bitwise operations or iteration.
3. Using a different data structure, such as a set or trie, instead of an array or map.

However, the benchmark's focus on comparing `array.find` and `map.get`, two built-in methods in JavaScript, makes it a relevant test case for understanding the performance trade-offs between these two approaches.

10 Objects in a 100 Object Pool; Array find vs Map get (version: 0) Benchmark.js

Comparing array find vs map get

Comparing performance of: `Array.find vs Map.get`

Created: 4 years ago by: Registered User

Go to the latest result

Array.find

Map.get

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

10 Objects in a 100 Object Pool; Array find vs Map get (version: 0) Benchmark.js

Comparing array find vs map get

Comparing performance of: Array.find vs Map.get

Created: 4 years ago by: Registered User

Go to the latest result

Array.find

Map.get

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `Array.find vs Map.get`