Benchmark: IndexOf Array vs String

Script Preparation code:

var str = '9999996'
var arr = str.split("")

Tests:

indexOf String
var index = str.indexOf("6") str.split("")
IndexOf Array
var index = arr.indexOf("6")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf String
IndexOf Array

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark compares the performance of two approaches: using `indexOf` on a string and using `indexOf` on an array.

**Options Being Compared**

1. **String-based indexing**: Using `indexOf` to find the position of a substring within a string.
2. **Array-based indexing**: Using `indexOf` to find the position of a value within an array.

**Pros and Cons**

* **String-based indexing**:
	+ Pros: Generally faster for small strings or when searching for a specific character.
	+ Cons: Can be slower for large strings due to the need to iterate over the entire string.
* **Array-based indexing**:
	+ Pros: Typically faster for large arrays, especially when searching for a value that is not at the beginning of the array.
	+ Cons: May be slower for small arrays or when searching for a specific character.

**Library Usage**

The benchmark does not explicitly use any external libraries. However, it assumes that the `indexOf` method is part of the JavaScript standard library, which is true in most modern browsers and environments.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in this benchmark beyond the standard `indexOf` method.

**Alternative Approaches**

If you wanted to test alternative approaches, you could consider:

* Using a different indexing method, such as binary search.
* Testing with large datasets to see how performance scales.
* Comparing performance on different types of data, such as numbers or objects.
* Using a different browser or environment to see how performance varies.

**Benchmark Preparation Code**

The script preparation code sets up the test data:
```javascript
var str = '9999996';
var arr = str.split('');
```
This creates a string `str` with 7 million occurrences of the character '6', and an array `arr` that is a copy of the characters in `str`.

**Individual Test Cases**

The benchmark defines two test cases:

1. **indexOf String**: This test case uses `indexOf` to find the position of the substring '6' within the string `str`.
2. **IndexOf Array**: This test case uses `indexOf` to find the position of the value '6' within the array `arr`.

The benchmark executes these two test cases and reports the results, including the number of executions per second for each browser and device platform.

I hope this explanation helps! Let me know if you have any further questions.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0

Browser/OS: Firefox 106 on Ubuntu

View result in a separate tab

Test name	Executions per second
indexOf String	16733094.0 Ops/sec
IndexOf Array	15680243.0 Ops/sec

Related benchmarks:

IndexOf Array vs String (version: 0)

Comparing performance of: indexOf String vs IndexOf Array

Created: 2 years ago by: Guest

Jump to the latest result

indexOf String

IndexOf Array

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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