Benchmark: Array.find vs. Map.getss

Array.find vs. Map.getss (version: 0)

Test the performance of Array.find vs. Map.get, with various array sizes, and with/without conversion from array to map

Comparing performance of: Array.find, 10 000 elements vs Map.get, 10 000 elements vs Array.find, 1 000 000 elements vs Map.get, 1 000 000 elements vs Array to Map + Map.get, 1 lookup vs Array to Map + Map.get, 10 lookups vs Array to Map + Map.get, 100 lookups vs Array.find, 10 lookups vs Array.find, 100 lookups

Created: 2 years ago by: Guest

Jump to the latest result

Script Preparation code:

function getRandomElement(id) {
  return {
    id,
    a: Math.random(),
    b: Math.random(),
    c: Math.random(),
  }
}

function getArray(length) {
  const result = [];
  for (let i = 0; i < length; i++) {
    result.push(getRandomElement(i))
  }
  
  return result;
}

function arrayToMap(array) {
  return new Map(array.map(el => [el.id, el]));
}

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

array_small = getArray(20);
array_large = getArray(50);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 10 000 elements
const target = getRandomInt(9999); array_small.find(el => el.id === target);
Map.get, 10 000 elements
const target = getRandomInt(9999); map_small.get(target);
Array.find, 1 000 000 elements
const target = getRandomInt(999999); array_large.find(el => el.id === target);
Map.get, 1 000 000 elements
const target = getRandomInt(999999); map_large.get(target)
Array to Map + Map.get, 1 lookup
const map = arrayToMap(array_small); const target = getRandomInt(9999); map.get(target);
Array to Map + Map.get, 10 lookups
const map = arrayToMap(array_small); for (let i = 0; i < 10; i++) { const target = getRandomInt(9999); map.get(target); }
Array to Map + Map.get, 100 lookups
const map = arrayToMap(array_small); for (let i = 0; i < 100; i++) { const target = getRandomInt(9999); map.get(target); }
Array.find, 10 lookups
for (let i = 0; i < 10; i++) { const target = getRandomInt(9999); array_small.find(el => el.id === target) }
Array.find, 100 lookups
for (let i = 0; i < 100; i++) { const target = getRandomInt(9999); array_small.find(el => el.id === target) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find, 10 000 elements
Map.get, 10 000 elements
Array.find, 1 000 000 elements
Map.get, 1 000 000 elements
Array to Map + Map.get, 1 lookup
Array to Map + Map.get, 10 lookups
Array to Map + Map.get, 100 lookups
Array.find, 10 lookups
Array.find, 100 lookups

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser/OS: Chrome 138 on Windows

View result in a separate tab

Test name	Executions per second
Array.find, 10 000 elements	21478886.0 Ops/sec
Map.get, 10 000 elements	78044344.0 Ops/sec
Array.find, 1 000 000 elements	11131631.0 Ops/sec
Map.get, 1 000 000 elements	77272392.0 Ops/sec
Array to Map + Map.get, 1 lookup	1436241.9 Ops/sec
Array to Map + Map.get, 10 lookups	1309431.8 Ops/sec
Array to Map + Map.get, 100 lookups	712405.6 Ops/sec
Array.find, 10 lookups	2475833.5 Ops/sec
Array.find, 100 lookups	274391.0 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 microbenchmark test case on the MeasureThat.net website. The benchmark compares the performance of `Array.find` and `Map.get` methods with various array sizes, as well as with/without conversion from an array to a map.

**Options Compared**

Two options are compared:

1. **Array.find**: This method searches for an element in the array using a callback function.
2. **Map.get**: This method retrieves the value associated with a given key from a map.

**Pros and Cons of Each Approach**

* **Array.find**:
	+ Pros: Simple to implement, works well for small arrays.
	+ Cons: Can be slower than Map.get for large arrays due to the need to iterate over the entire array.
* **Map.get**:
	+ Pros: Generally faster than Array.find for large arrays, as it uses a hash table for efficient lookups.
	+ Cons: Requires an initial map creation step, which can be time-consuming.

**Test Scenarios**

The benchmark tests six different scenarios:

1. `Array.find`, 10,000 elements
2. `Map.get`, 10,000 elements
3. `Array.find`, 1,000,000 elements
4. `Map.get`, 1,000,000 elements
5. `Array.find`, 10 lookups (i.e., searching for a single element multiple times)
6. `Array to Map + Map.get` with 1 lookup

**Results**

The benchmark results show the number of executions per second for each test scenario on a desktop Ubuntu platform running Firefox 117. The results indicate that:

* `Map.get` is generally faster than `Array.find`, especially for large arrays.
* Creating an array to map can provide additional performance benefits, although this effect diminishes as the input size increases.

Overall, the benchmark suggests that using `Map.get` with a pre-created map can be a more efficient approach than relying solely on `Array.find`. However, the specific results may vary depending on the specific use case and implementation details.

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