Benchmark: Demo benchmark - MeasureThat.net

HTML Preparation code:

<div>This is demo</div>

Script Preparation code:

console.log("js preparation");
var precompiledRE = new RegExp('o');

Tests:

RegExp#test
/o/.test('Hello World!');
String#indexOf
'Hello World!'.indexOf('o') > -1;
String#match
!!'Hello World!'.match(/o/);
Using the same precompiled RegExp
precompiledRE.test('Hello World');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
RegExp#test
String#indexOf
String#match
Using the same precompiled RegExp

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36

Browser/OS: Chrome 57 on Mac OS X 10.11.6

View result in a separate tab

Test name	Executions per second
RegExp#test	9119311.0 Ops/sec
String#indexOf	24385068.0 Ops/sec
String#match	6520350.0 Ops/sec
Using the same precompiled RegExp	3753231.8 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of MeasureThat.net**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. These benchmarks help measure the performance of various JavaScript operations, such as string methods, regular expressions, and more.

**Benchmark Definition JSON Analysis**

The provided benchmark definition JSON contains four individual test cases:

1. `RegExp#test`: Tests the performance of the `RegExp#test` method.
2. `String#indexOf`: Tests the performance of the `String#indexOf` method.
3. `String#match`: Tests the performance of the `String#match` method.
4. `Using the same precompiled RegExp`: Tests the performance of using a precompiled regular expression.

**Options Compared**

In each test case, the following options are compared:

* For `RegExp#test`, no options are explicitly compared.
* For `String#indexOf`, two options are implicitly compared: `indexOf` with and without the `-1` offset. However, in reality, only one specific implementation of `indexOf` might be tested (e.g., the one that uses a precomputed lookup table).
* For `String#match`, no explicit options are compared.
* For `Using the same precompiled RegExp`, two implementations are implicitly compared: using a precompiled regular expression and not using it.

**Pros and Cons of Different Approaches**

1. **Precompiled Regular Expressions**: Using precompiled regular expressions can improve performance by reducing the overhead of compiling a new regex object on each iteration. However, this approach requires additional code to create the precompiled regex and store it in a variable (as shown in the "Script Preparation Code" section).
2. **Native String Methods**: Native string methods like `indexOf` and `match` are often implemented using optimized C++ code inside V8 or SpiderMonkey engines. This results in faster execution times compared to JavaScript-based implementations. However, these methods can be slower if not optimized correctly.
3. **Using the Same Precompiled RegExp**: Using a precompiled regex reduces compilation overhead, but it requires more memory to store the compiled regex. Additionally, this approach might lead to cache issues if the same regex is used in multiple iterations.

**Library and Purpose**

In the provided benchmark definition, the `RegExp` object is used for testing the performance of the `RegExp#test` method. The purpose of using a regular expression is to test the performance of searching for a specific pattern within a string.

**Special JS Features or Syntax**

No special JavaScript features or syntax are explicitly mentioned in the provided benchmark definition. However, some older versions of JavaScript might have had different implementations for these methods, but that's not relevant to this specific benchmark.

**Alternatives**

If you want to create your own microbenchmarks using MeasureThat.net, you can explore other options:

1. **BenchmarkJS**: A popular benchmarking framework for Node.js that provides a similar API to MeasureThat.net.
2. **js-benchmark**: A lightweight JavaScript library for creating benchmarks that's designed specifically for browser-based tests.
3. **Benchmark++**: An open-source benchmarking framework that allows you to create and run microbenchmarks in various programming languages, including JavaScript.

By understanding the options and approaches used in MeasureThat.net, developers can create their own high-quality benchmarks to test and optimize their JavaScript code.

Related benchmarks:

Demo benchmark (version: 0)

From https://benchmarkjs.com/

Comparing performance of: RegExp#test vs String#indexOf vs String#match vs Using the same precompiled RegExp

Created: 7 years ago by: Guest

Jump to the latest result

RegExp#test

String#indexOf

String#match

Using the same precompiled RegExp

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):