Benchmark: IndexOf vs startwith

HTML Preparation code:

<div></div>

Script Preparation code:

window.searchValue = 'Test';
var data = window.data = [];
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000;

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

function makeRandomString(len) {
  var text = "";
  for( var i=0; i < len; i++ ) {
    text += possible.charAt(getRandomInt(possible.length));
  }
  return text;
}

while (data.length < TOTAL_STRINGS) {
  data.push(makeRandomString(getRandomInt(20)));
}

Tests:

IndexOf
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var searchValue = window.searchValue; while (x < TOTAL_STRINGS) { const str = data[x]; str.toLowerCase().indexOf(searchValue.toLowerCase()) > -1; x += 1; }
Startwith
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var searchValue = window.searchValue; while (x < TOTAL_STRINGS) { const str = data[x]; str.toLowerCase().startsWith(searchValue.toLowerCase()); x += 1; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Startwith

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the Benchmark Definition JSON and explain what is tested on the provided website.

**Benchmark Overview**

The benchmark measures the performance of two JavaScript methods: `indexOf` and `startsWith`. Both methods are used to search for a string within an array of strings. The goal is to determine which method is faster, especially for larger datasets.

**Script Preparation Code**

Before running the benchmarks, the script preparation code sets up the environment:

* It creates an empty array `data` with 100,000 random strings.
* It defines a string `possible` containing all possible characters (uppercase and lowercase letters, numbers).
* It defines two functions: `getRandomInt(max)` generates a random integer between 0 and `max`, and `makeRandomString(len)` creates a random string of length `len` using the `possible` string.

**Html Preparation Code**

The HTML preparation code is empty, indicating that no additional HTML elements are needed for the benchmark.

**Individual Test Cases**

There are two test cases:

1. **IndexOf**: This test case uses the `indexOf` method to search for a specific string within the array of strings. The method converts both the search value and the array element to lowercase before comparing.
2. **Startwith**: This test case uses the `startsWith` method to search for a specific prefix within the array of strings.

**Library Used**

There is no explicit library used in these benchmark definitions. However, it's likely that the JavaScript engine being tested (e.g., V8) provides the built-in implementation for `indexOf` and `startsWith`.

**Special JS Features or Syntax**

None of the test cases use any special JavaScript features or syntax.

**Pros and Cons of Different Approaches**

Here are some pros and cons of using `indexOf` versus `startsWith`:

* **IndexOf**:
	+ Pros: Generally faster for searching a string within an array.
	+ Cons: May be slower when searching for a prefix, as it needs to iterate through the entire array.
* **Startwith**:
	+ Pros: Can be faster when searching for a prefix, as it only needs to check the beginning of each array element.
	+ Cons: May be slower for searching a string within an array, as it needs to iterate through the entire array.

**Other Considerations**

When choosing between `indexOf` and `startsWith`, consider the following factors:

* The type of search: If you're searching for a prefix, `startsWith` might be a better choice. If you're searching for a specific string within an array, `indexOf` might be faster.
* The size of the dataset: For very large datasets, `indexOf` might be slower due to its need to iterate through the entire array.

**Alternatives**

If you want to explore other benchmarking tools or alternatives, consider:

* **BenchmarkDotNet**: A popular open-source benchmarking library for .NET languages.
* **Google's Benchmark**: A lightweight and easy-to-use benchmarking library for JavaScript.
* **jsPerf**: A simple and easy-to-use benchmarking tool specifically designed for web browsers.

Keep in mind that the choice of benchmarking tool or alternative depends on your specific needs, requirements, and language preferences.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; ONEPLUS A5000) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Mobile Safari/537.36

Browser/OS: Chrome Mobile 84 on Android

View result in a separate tab

Test name	Executions per second
IndexOf	93.9 Ops/sec
Startwith	74.5 Ops/sec

Related benchmarks:

IndexOf vs startwith (version: 0)

Comparing performance of: IndexOf vs Startwith

Created: 4 years ago by: Guest

Jump to the latest result

IndexOf

Startwith

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):