Benchmark: .includes() vs .test() vs .match() vs .indexOf() begin

Script Preparation code:

var url='https://www.google.com/matchthis/other/args'

Tests:

text.includes()
url.includes('https://www.google.com')
regex.test()
/matchthis/.test(url)
string.match()
url.match(/matchthis/)
string.indexOf()
url.indexOf('https://www.google.com') >= 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
text.includes()
regex.test()
string.match()
string.indexOf()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
text.includes()	18480842.0 Ops/sec
regex.test()	10369788.0 Ops/sec
string.match()	8831042.0 Ops/sec
string.indexOf()	18264334.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll explain what's being tested in the provided JSON, compare different approaches, and discuss their pros and cons.

**What is being tested?**

The benchmark compares four different methods for finding a substring within a string:

1. `includes()`: A method introduced in JavaScript 13 (ECMAScript 2022) that allows you to check if a string includes another string.
2. `test()`: Not a standard JavaScript method, but rather a part of the `RegExp` object, which is used for regular expressions.
3. `match()`: Another method from the `RegExp` object, specifically designed for matching patterns in strings.
4. `indexOf()`: A built-in method that returns the index of the first occurrence of a substring within another string.

**Comparison of approaches**

Here's a brief overview of each approach:

* `includes()`:
	+ Pros: Fast and efficient, especially for large strings. It uses a binary search algorithm to find the substring.
	+ Cons: Not supported in older JavaScript versions (before ECMAScript 2022).
* `test()`: A method from the `RegExp` object that tests if a string matches a regular expression pattern. While it can be used for substring matching, its primary purpose is for more complex pattern matching.
	+ Pros: Can be used with regular expressions to match patterns, not just substrings.
	+ Cons: Can be slower than the other methods due to the complexity of the regular expression engine.
* `match()`: Another method from the `RegExp` object that returns an array of matches if there are any. While it can be used for substring matching, its primary purpose is for finding multiple matches in a string.
	+ Pros: Can be used with regular expressions to find multiple matches, not just substrings.
	+ Cons: Can be slower than the `includes()` method due to the complexity of the regular expression engine and the need to create an array of matches.
* `indexOf()`: A built-in method that returns the index of the first occurrence of a substring within another string. It's a simple, iterative approach that can be slow for large strings.
	+ Pros: Built-in method, so it's available in all JavaScript environments.
	+ Cons: Can be slower than the other methods due to its linear search algorithm.

**Library and purpose**

None of the methods use any external libraries or frameworks specifically designed for string matching. However, `RegExp` is a built-in object that provides regular expression functionality, including `test()` and `match()`. These methods can be used with additional libraries or frameworks if needed.

**Special JS feature or syntax**

The benchmark uses ECMAScript 2022 features (introduced in JavaScript 13), specifically the `includes()` method. This is a new feature introduced in recent versions of JavaScript, so it may not work in older environments.

**Other alternatives**

If none of these methods are suitable for your use case, you can consider using:

* `String.prototype.startsWith()` and `String.prototype.endsWith()`: These methods can be used to check if a string starts or ends with another substring.
* `Array.prototype.indexOf()`: This method can be used to find the index of a substring within an array of strings.

In summary, while there are different approaches to finding substrings in JavaScript, `includes()` is generally the fastest and most efficient method for simple substring matching.

Related benchmarks:

.includes() vs .test() vs .match() vs .indexOf() begin (version: 0)

Compare different intra-string matching styles

Comparing performance of: text.includes() vs regex.test() vs string.match() vs string.indexOf()

Created: one year ago by: Guest

Jump to the latest result

text.includes()

regex.test()

string.match()

string.indexOf()

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):