Benchmark: Array.includes vs Set.has vas Map.has vs Object accessor

Script Preparation code:

var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var b = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
var c = new Map([[1, 1], [2, 2], [3, 3], [4, 4], [5, 5], [6, 6], [7, 7], [8, 8], [9, 9], [10, 10]]);
var d = {a: 1, b: 2, c: 3, d: 4, e: 5, f:6, g:7, h:8, i:9, l:10};

Tests:

Array includes
return a.includes(9);
Set has
return b.has(9);
Map has
return c.has(9);
Object accessor
return d[i]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array includes
Set has
Map has
Object accessor

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 18 on iOS 18.1.1

View result in a separate tab

Map has

463.4M/s

Set has

463.1M/s

Object accessor

249.5M/s

Array includes

90.8M/s

View exact numbers

Test name	Executions per second
✓ Map has	463,449,248 Ops/sec
Set has	463,124,704 Ops/sec
Object accessor	249,505,792 Ops/sec
Array includes	90,838,304 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 explain what's being tested.

**What is being tested?**

The test measures the performance of four different approaches to check if a value exists in an array or a collection:

1. `Array.includes()`
2. `Set.has()`
3. `Map.has()`
4. Object accessor (`d[i]`)

These methods are used to determine whether a specific value is present in the respective data structures.

**Options compared**

The benchmark compares the performance of each method across different execution scenarios:

* `Array.includes()` vs `Set.has()` vs `Map.has()`: These three methods are tested with an array and a set/object, respectively.
* Object accessor (`d[i]`): This method is tested alone, using an object with a dynamic key.

**Pros and Cons of each approach**

Here's a brief overview of the advantages and disadvantages of each method:

1. **Array.includes()**
	* Pros: Simple, widely supported, and easy to implement.
	* Cons: May be slower for large arrays due to the iteration process.
2. **Set.has()**
	* Pros: Fast lookups using hash tables, suitable for large datasets.
	* Cons: Requires a Set object, which may not be available in all environments.
3. **Map.has()**
	* Pros: Similar to Set.has(), with fast lookups and suitable for large datasets.
	* Cons: May require additional overhead due to the Map object's implementation.
4. **Object accessor (`d[i]`)**:
	* Pros: Simple, lightweight, and easy to implement.
	* Cons: May be slower due to the dynamic lookup process.

**Library and purpose**

In the test case "Array includes", `Set.has()` is used, which implies that a Set object is available. However, in the provided benchmark result, it's noted that both `Set.has()` and `Map.has()` have similar performance characteristics. This suggests that the Set and Map objects might be implemented similarly or with identical performance characteristics.

**Special JS features or syntax**

None are mentioned explicitly in the provided benchmark definition or results.

Array.includes vs Set.has vas Map.has vs Object accessor (version: 0)

Comparing performance of: `Array includes vs Set has vs Map has vs Object accessor`

Created: 2 years ago by: Guest

Go to the latest result

Array includes

Set has

Map has

Object accessor

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Array.includes vs Set.has vas Map.has vs Object accessor (version: 0)

Comparing performance of: Array includes vs Set has vs Map has vs Object accessor

Created: 2 years ago by: Guest

Go to the latest result

Array includes

Set has

Map has

Object accessor

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 includes vs Set has vs Map has vs Object accessor`