Benchmark: String i18n parsing

Script Preparation code:

var str = "{count, plural, one{# abc flsfhslghrl f;fglgklgfpore 3423fdsfp } two{l;k4h 4lk234h23 l45k 435kl345 h#} many{lfkh3 l3kg4l$#kl;} other{# fglks lfgksh fslkgheoigf sgneso}}";
var query = "many";

Tests:

Regex dynamic
var exp = new RegExp(query + "{([^}]+)}"); var res = exp.exec(str)[1];
Regex compiled
var exp = new RegExp(/many{([^}]+)}/); var res = exp.exec(str)[1];
Index parsing
var substr = str.substring(str.indexOf(query + "{") + query.length + 1); var res = substr.substring(0, substr.indexOf("}"));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex dynamic
Regex compiled
Index parsing

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36 Edg/94.0.992.47

Browser/OS: Chrome 94 on Windows

View result in a separate tab

Test name	Executions per second
Regex dynamic	1586032.2 Ops/sec
Regex compiled	2339284.2 Ops/sec
Index parsing	2858112.5 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 explanation of the provided benchmark.

**What is being tested?**

The website MeasureThat.net provides a JavaScript microbenchmarking platform, where users can create and run benchmarks to compare different approaches for parsing strings with internationalization (i18n) features. The current benchmark tests three approaches: regex compilation, regex dynamic execution, and index parsing.

**Options compared**

1. **Regex compiled**: This approach compiles the regular expression using `new RegExp(query + "{([^}]+)}")`. The benefits of this approach are:
	* Performance improvement due to reduced overhead of repeated regex creation.
	* Simplified code for those familiar with regex.
However, it also has some cons:
	* Potential security risks if the input query is not sanitized properly.
2. **Regex dynamic**: This approach executes the regular expression dynamically using `exp.exec(str)[1]`. The benefits are:
	* More flexible than compiled regex, as the same regex pattern can be used for multiple strings.
	* Better error handling, as any errors in the regex execution will be reported.
However, it also has some cons:
	* Performance overhead due to repeated regex creation and parsing.
3. **Index parsing**: This approach uses `str.substring(str.indexOf(query + "{") + query.length + 1)` followed by `substr.substring(0, substr.indexOf("}"))`. The benefits are:
	* Avoids the use of regex altogether, which can be beneficial for performance-critical code or when dealing with complex regex patterns.
However, it also has some cons:
	* May not work correctly if the input string contains multiple matches for `query + "{"`.
	* Requires manual handling of the index parsing logic.

**Library and purpose**

In this benchmark, no specific libraries are used. The regular expression engine is part of JavaScript's built-in functionality.

**Special JS feature or syntax**

There are a few special features and syntax in this benchmark:

1. **Template literals**: The string `str` uses template literals (`var str = "{count, plural, one{# abc flsfhslghrl f;fglgklgfpore 3423fdsfp } two{l;k4h 4lk234h23 l45k 435kl345 h#} many{lfkh3 l3kg4l$#kl;} other{# fglks lfgksh fslkgheoigf sgneso}}"`) to create a multi-line string with variable replacement. This syntax was introduced in ECMAScript 2015 (ES6) and is still widely used today.
2. **Regex patterns**: The regular expression patterns `query + "{([^}]+]}"` and `/many{([^}]+)}/` are used to match the `str` string. These patterns are specific to regex and require a good understanding of regex syntax.

**Other alternatives**

If you were to rewrite this benchmark using alternative approaches, some options could be:

1. **Use a dedicated i18n library**: Instead of relying on regex or index parsing, consider using a dedicated i18n library like `intl` or `i18n-js`. These libraries provide more robust and flexible solutions for handling internationalization in JavaScript.
2. **Use a different data structure**: If the input strings are not fixed and need to be generated dynamically, consider using a data structure like an array of objects instead of template literals.

In conclusion, this benchmark provides a straightforward comparison of three approaches for parsing strings with i18n features: regex compilation, regex dynamic execution, and index parsing. The results can help developers choose the best approach for their specific use case.

Related benchmarks:

String i18n parsing (version: 0)

Comparing performance of: Regex dynamic vs Regex compiled vs Index parsing

Created: 3 years ago by: Guest

Jump to the latest result

Regex dynamic

Regex compiled

Index parsing

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):