Benchmark: Compare array find and new Map with get

Script Preparation code:

var array = [{ name: 'A'}, { name: 'B'}, { name: 'C'}, { name: 'D'}, { name: 'E'}, { name: 'F'}, { name: 'G'}, { name: 'H'}];

Tests:

array find
array.find(a => a.name === 'G')
map get
var map = new Map(array.map((x) => [x.name, x])); map.get('G')

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: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser/OS: Chrome 110 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array find	21387518.0 Ops/sec
map get	3151077.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and their pros/cons.

**Benchmark Overview**

The benchmark compares two approaches for finding an element in an array:

1. Using the `find()` method
2. Creating a Map from the array using `Map` constructor and then retrieving the value using `get()`

**Library: Array.prototype.find()**

The `find()` method is part of the Array prototype in JavaScript. Its purpose is to find the first element in an array that satisfies a given condition. In this case, the condition is checking if the `name` property of each element is equal to `'G'`.

Pros:

* Concise and expressive syntax
* Fast execution performance

Cons:

* May not work well with large arrays or complex conditions due to its iterative nature.
* Can be slower than other approaches for very large datasets.

**Library: Map**

The `Map` constructor creates a new Map object, which is an unordered collection of key-value pairs. In this case, the array is mapped to a Map using the `map()` method, where each element in the array becomes a key-value pair in the Map.

Pros:

* Fast execution performance for looking up values by key.
* Can be useful for caching or storing data with fast lookups.

Cons:

* Requires extra memory to store the Map instance and its contents.
* May have slower initialization time compared to other approaches.

**Comparison**

The comparison is between using `find()` and creating a Map from the array, then retrieving the value using `get()`. The idea is to test which approach is faster for finding an element in the array with the given condition.

Pros of comparing these two approaches:

* Allows users to understand the trade-offs between conciseness vs. performance.
* Helps identify potential bottlenecks or areas for optimization.

Cons of comparing these two approaches:

* May create unnecessary complexity or confusion if not explained clearly.
* Requires careful benchmarking and interpretation of results.

**Other Alternatives**

Other alternatives for finding an element in an array include:

1. `forEach()`: Iterates over the array, allowing you to check each element individually.
2. Regular expressions: Can be used to match patterns in the array elements.
3. Using a custom iterator or generator function.

These alternatives may have different performance characteristics and trade-offs compared to using `find()` or creating a Map from the array.

**Special JS Feature/Syntax**

In this benchmark, there is no special JS feature or syntax being tested. The code only uses standard JavaScript features and libraries (Array.prototype.find() and Map).

Related benchmarks:

Compare array find and new Map with get (version: 0)

Comparing performance of: array find vs map get

Created: one year ago by: Guest

Jump to the latest result

array find

map get

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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