Benchmark: Various string search methods

Script Preparation code:

var testStr="Test string of moderate length that ends with the phrase Hello World!";

Tests:

Includes for last word
testStr.includes("World!");
Includes for middle word
testStr.includes("ends");
EndsWtih for last word
testStr.endsWith("World!");
RegEx for last word (with anchor)
/World!$/.test(testStr);
RegEx for middle word
/ends/.test(testStr);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes for last word
Includes for middle word
EndsWtih for last word
RegEx for last word (with anchor)
RegEx for middle word

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
Includes for last word	17291490.0 Ops/sec
Includes for middle word	17361240.0 Ops/sec
EndsWtih for last word	14672502.0 Ops/sec
RegEx for last word (with anchor)	11637571.0 Ops/sec
RegEx for middle word	9360369.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark, hosted on MeasureThat.net, aims to compare the performance of different string search methods in JavaScript. The test cases focus on searching for specific substrings within a moderately long string that ends with "Hello World!".

**Test Cases**

There are four individual test cases:

1. **Includes for last word**: Searches for the substring "World!" from the end of the string using `testStr.includes("World!")`.
2. **Includes for middle word**: Searches for the substring "ends" in the middle of the string using `testStr.includes("ends")`.
3. **EndsWith for last word**: Verifies that the entire string ends with "Hello World!" using `testStr.endsWith("World!")`.
4. **RegEx for last word (with anchor)**: Uses a regular expression to search for the substring "World!" from the end of the string, anchored with `/World!$/.test(testStr)`.
5. **RegEx for middle word**: Searches for the substring "ends" in the middle of the string using `testStr.match(/ends/)`. However, it's worth noting that this test case is not actually comparing the performance of regular expressions.

**Comparison Options**

The benchmark compares the performance of the following options:

* **String.includes()**: A built-in JavaScript method for searching a substring within a string.
* **String.endsWith()**: A built-in JavaScript method for verifying that a string ends with another substring.
* **Regular Expression (RegEx) search**: Using the `/World!$/.test(testStr)` syntax to search for a substring from the end of the string.

**Pros and Cons**

Here's a brief summary of the pros and cons of each option:

1. **String.includes()**:
	* Pros: Simple, efficient, and widely supported.
	* Cons: May not perform well with very large strings or complex searches.
2. **String.endsWith()**:
	* Pros: Fast and efficient for simple end-of-string checks.
	* Cons: Limited to checking only the last few characters of a string.
3. **Regular Expression (RegEx) search**:
	* Pros: Highly flexible and powerful, but may be slower than other options due to the overhead of parsing regular expressions.
	* Cons: Steeper learning curve, and may not perform well with very large strings.

**Library Usage**

The benchmark does not use any external libraries beyond what's already included in JavaScript (e.g., `String` methods).

**Special JS Features/Syntax**

None are mentioned in the provided test cases. If special features or syntax were being used, they would likely impact the performance and behavior of each test case.

**Alternatives**

For similar benchmarking purposes, you could also explore other options:

* **Benchmarking frameworks**: Tools like Benchmark.js, Fastify Benchmarks, or Webpack's built-in benchmarks can help with creating and running microbenchmarks.
* **String search libraries**: Libraries like StringSearch or StrSubstr provide alternative string search methods that might be worth testing in a benchmarking context.

Related benchmarks:

Various string search methods (version: 0)

Comparing performance of: Includes for last word vs Includes for middle word vs EndsWtih for last word vs RegEx for last word (with anchor) vs RegEx for middle word

Created: one year ago by: Guest

Jump to the latest result

Includes for last word

Includes for middle word

EndsWtih for last word

RegEx for last word (with anchor)

RegEx for middle word

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):