Benchmark: set vs array find if exists v2

Script Preparation code:

var a = [100,90,80,70,60,50,40,30,20,1,2,3,4,5,6,7,8,9,10];
var b = new Set(a)

Tests:

array
a.indexOf(30);
set
b.has(30);

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 provided benchmark JSON and explain what's being tested.

**Benchmark Definition**

The website provides a JavaScript microbenchmarking platform, where users can create and run benchmarks. The provided JSON represents a single benchmark definition:

```json
{
    "Name": "set vs array find if exists v2",
    "Description": null,
    "Script Preparation Code": "var a = [100,90,80,70,60,50,40,30,20,1,2,3,4,5,6,7,8,9,10];\r\nvar b = new Set(a)",
    "Html Preparation Code": null
}
```

Here's what's being tested:

* A JavaScript variable `a` is initialized as an array of 20 integers.
* Another variable `b` is created from the same array using a `Set` object.

**Options Compared**

Two different approaches are compared in this benchmark:

1. **Array indexing**: The first test case uses the `indexOf()` method to search for a specific element (30) in the array `a`. This approach has a time complexity of O(n), where n is the length of the array.
2. **Set lookup**: The second test case uses the `has()` method to check if an element exists in the set `b`. This approach has an average time complexity of O(1) for most modern JavaScript engines, as sets use a hash table internally.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Array indexing (indexOf())**:
	+ Pros: widely supported across different browsers and environments.
	+ Cons: can be slow for large datasets due to the O(n) time complexity.
* **Set lookup (has())**:
	+ Pros: generally faster than array indexing, especially for large datasets.
	+ Cons: may not work as expected in older browsers or environments that don't support sets.

**Library and Purpose**

The `Set` object is a built-in JavaScript library that provides an efficient way to store and look up unique values. The purpose of using a set in this benchmark is to take advantage of the hash table implementation, which allows for fast lookup times.

**Special JS Feature or Syntax**

None mentioned in this benchmark.

**Other Alternatives**

While `Set` objects are widely supported, there are alternative data structures that can be used for fast lookups:

* **Maps**: Like sets, maps provide key-value pairs and have an average time complexity of O(1) for lookup operations.
* **Object literals**: You can also use object literals with the `in` operator or the `hasOwnProperty()` method to check if a property exists in an object.

Keep in mind that these alternatives may not be as widely supported or performant as sets, especially in older browsers or environments.

Related benchmarks:

set vs array find if exists v2 (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):