Benchmark: set vs array speed real

Script Preparation code:

var testArray = ['hello', 'a', 'bc', 'swag', 'sneed', '9139028930812903812'];
var testSet = new Set(['hello', 'a', 'bc', 'swag', 'sneed', '9139028930812903812']);

Tests:

Array
testArray.find(item => item === 'swag');
Set
testSet.has('swag');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array
Set

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested.

**Overview**

The benchmark measures the speed difference between using an array and a Set data structure in JavaScript to search for a specific value. A Set is a collection of unique values, which can provide faster lookups than arrays, especially when dealing with large datasets.

**Benchmark Definition JSON**

The provided JSON represents two benchmark definitions:

1. **Array**: The first benchmark definition uses the `find()` method on an array to search for the value `'swag'`. This is a classic example of using an array's indexing system to find a specific element.
2. **Set**: The second benchmark definition uses the `has()` method on a Set to check if the value `'swag'` exists in the set.

**Options Compared**

Two options are being compared:

1. **Array**: Using an array's indexing system (`find()`) to search for a specific value.
2. **Set**: Using a Set data structure (`has()`) to check if a value exists.

**Pros and Cons of Each Approach:**

**Array**

Pros:

* Wide support across browsers and versions
* Easy to implement and use

Cons:

* Can be slow for large datasets due to the need to scan through all elements
* May not perform well for duplicate values (e.g., if the array contains multiple copies of `'swag'`)

**Set**

Pros:

* Generally faster than arrays for lookup operations, especially with unique values
* Can handle duplicate values without issues

Cons:

* May not be supported by older browsers or versions
* Requires careful consideration when adding and removing elements from a Set to maintain uniqueness.

**Library Usage**

In this benchmark, the `Set` data structure is used in conjunction with the built-in JavaScript `Set` object. The `has()` method is a part of the standard JavaScript API and is available across most browsers and versions.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. It's focused on comparing two fundamental data structures (arrays vs. Sets) for a specific use case.

**Other Alternatives**

If you're looking for alternative approaches to search for values in arrays or Sets, here are some options:

* For Arrays:
	+ `indexOf()` method: Similar to `find()`, but returns -1 if not found.
	+ `includes()` method ( introduced in ECMAScript 2015 ): Returns a boolean indicating whether the array includes the specified value.
* For Sets:
	+ `add()` and `delete()` methods: Used to add or remove elements from a Set, respectively.

Keep in mind that the choice of data structure and method depends on the specific use case, performance requirements, and compatibility with different browsers and versions.

Related benchmarks:

set vs array speed real (version: 0)

Comparing performance of: Array vs Set

Created: 2 years ago by: Guest

Jump to the latest result

Array

Set

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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