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

Latest run results:

Run details: (Test run date: 28 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
IndexOf	10207.9 Ops/sec
Startwith	312.3 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months 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.

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 2 months ago):