Benchmark: RegEx.test vs String.includes vs String.indexOf

Script Preparation code:

var string = "Hello world!";
var regex = /Hello/;

Tests:

RegEx.test
regex.test(string)
String.includes
string.includes("Hello")
String.indexOf
string.indexOf("Hello")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegEx.test
String.includes
String.indexOf

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark.

**What is tested?**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three different approaches:

1. `regex.test(string)`: This function tests the performance of the `test()` method, which is part of the regular expression (RegExp) API.
2. `string.includes("Hello")`: This function tests the performance of the `includes()` method, which is a string method that checks if a substring exists within another string.
3. `string.indexOf("Hello")`: This function tests the performance of the `indexOf()` method, which is also a string method that returns the index of the first occurrence of a substring.

**Options compared**

The benchmark compares the performance of these three approaches on different strings:

* In "RegEx.test", only one specific regular expression `/Hello/` is used to test the performance of the `test()` method.
* In "String.includes", only the string `"Hello"` is used, and it's included within a general-purpose string `"Hello world!"`.
* In "String.indexOf", also only the string `"Hello"` is used, but with different indices.

**Pros and cons**

Here are some pros and cons of each approach:

1. `regex.test(string)`: This approach has a relatively simple and specific regular expression to test.
	* Pros: Easy to maintain and understand; allows for fine-grained control over the regex pattern.
	* Cons: May not accurately represent real-world use cases, as the regex pattern is very specific.
2. `string.includes("Hello")`: This approach uses a general-purpose string with a substring `"Hello"`.
	* Pros: More representative of real-world use cases, where strings are often used to search for substrings.
	* Cons: May be slower than the `regex.test()` method due to the overhead of searching through the entire string.
3. `string.indexOf("Hello")`: This approach also uses a general-purpose string `"Hello world!"`, but with different indices.
	* Pros: Similar to the previous one, as it's more representative of real-world use cases.
	* Cons: May not be as effective in cases where the substring appears multiple times.

**Other considerations**

The benchmark doesn't account for other factors that might affect performance, such as:

* Input size and complexity
* Platform differences (e.g., browser, OS)
* Additional context or flags passed to each method

**Library usage**

None of the individual test cases use external libraries, but it's worth noting that if a library were used in one of the benchmarking approaches (e.g., `String.prototype.includes()`), it would likely be a standard JavaScript library function.

**Special JS features or syntax**

There are no special JS features or syntax mentioned in this benchmark. The test cases focus on basic string methods and regular expressions.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0

Browser/OS: Firefox 96 on Windows

View result in a separate tab

Test name	Executions per second
RegEx.test	25592350.0 Ops/sec
String.includes	41026540.0 Ops/sec
String.indexOf	46109890.0 Ops/sec

Related benchmarks:

RegEx.test vs String.includes vs String.indexOf (version: 0)

Comparing performance of: RegEx.test vs String.includes vs String.indexOf

Comparing performance of: RegEx.test vs String.includes vs String.indexOf

Created: 2 years ago by: Guest

Jump to the latest result

RegEx.test

String.includes

String.indexOf

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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