Benchmark: Array.find vs. Map.get 20241610 2

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(100);
array_large = getArray(1000000);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 10 000 elements
const target = getRandomInt(99); for (let i = 0; i < 100; i++) { array_small.find(el => el.id === target); }
Map.get, 10 000 elements
map_small = arrayToMap(array_small); for (let i = 0; i < 100; i++) { const target = getRandomInt(99); map_small.get(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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser/OS: Firefox 140 on Linux

View result in a separate tab

Test name	Executions per second
Array.find, 10 000 elements	57209.0 Ops/sec
Map.get, 10 000 elements	151109.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what is being tested in the provided JSON.

The benchmark compares the performance of two approaches:

1. **Array.find**: This method searches for an element in an array that satisfies a condition (in this case, `el.id === target`). The search starts from the beginning of the array and moves forward until it finds a match or reaches the end.
2. **Map.get**: This method retrieves the value associated with a given key from a Map object.

**Options compared:**

* Array size: Two sizes are used: 100 elements (`array_small`) and 1,000,000 elements (`array_large`).
* Conversion from array to map: Some tests use conversion from array to map (`map_small` and `map_large`), while others do not.

**Pros and cons of each approach:**

* **Array.find**:
	+ Pros:
		- Simple implementation.
		- Can be useful when the data is small or sparse, as it avoids unnecessary memory allocation.
	+ Cons:
		- Slower for large datasets due to the need to scan the entire array.
		- May cause issues if the condition is not properly optimized (e.g., using `Array.prototype.indexOf()` instead of `Array.prototype.find()`).
* **Map.get**:
	+ Pros:
		- Faster for large datasets, as it uses a hash table data structure that allows for efficient lookups.
		- More memory-efficient than arrays, especially for dense data.
	+ Cons:
		- Requires more memory to store the Map object and its entries.
		- May have additional overhead due to the creation of a new object.

**Library/Tool usage:**

The benchmark uses the following libraries:

* None (native JavaScript methods).

**Special JS feature/syntax:**

None mentioned in this explanation, but some of these features might be used in other tests or benchmarks. For example, `getRandomElement` and `arrayToMap` are custom functions that create random data for testing purposes.

**Other alternatives:**

For large-scale performance comparisons, you might also consider:

* Using a benchmarking framework like Benchmark.js or micro-benchmark.
* Utilizing WebAssembly (WASM) benchmarks to compare the performance of different JavaScript engines.
* Leveraging multi-threading or parallel processing techniques to test concurrent execution of Array.find and Map.get.

Keep in mind that these alternatives may have additional complexity, setup requirements, and trade-offs compared to the simple JSON-based benchmark provided.

Related benchmarks:

Array.find vs. Map.get 20241610 2 (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

Created: one year ago by: Guest

Jump to the latest result

Array.find, 10 000 elements

Map.get, 10 000 elements

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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