Benchmark: querystringify pre-initialize regexp

Script Preparation code:

function decode(input) {
  return decodeURIComponent(input.replace(/\+/g, ' '));
}

function querystringNotPrepared(query) {
  var parser = /([^=?&]+)=?([^&]*)/g
    , result = {}
    , part;

  for (;
    part = parser.exec(query);
    result[decode(part[1])] = decode(part[2])
  );

  return result;
}

var PARSER = /([^=?&]+)=?([^&]*)/g;

function querystringPrepared(query) {
  var result = {}
    , part;

  for (;
    part = PARSER.exec(query);
    result[decode(part[1])] = decode(part[2])
  );

  return result;
}

Tests:

not prepared
querystringNotPrepared( 'foo=bar&bar=foo' );
prepared
querystringPrepared( 'foo=bar&bar=foo' );

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
not prepared
prepared

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36

Browser/OS: Yandex Browser 25 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
not prepared	862464.9 Ops/sec
prepared	861981.3 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its components for you.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark compares two approaches to parse query strings in JavaScript: one with the `querystringNotPrepared` function and another with the `querystringPrepared` function.

**Prepared vs Not Prepared Query String Parsing**

In this benchmark, we have two test cases:

1. `not prepared`: This test case uses the `querystringNotPrepared` function to parse a query string without pre-initializing the regular expression.
2. `prepared`: This test case uses the `querystringPrepared` function to parse a query string with pre-initialized regular expression.

**Options Compared**

The two functions, `querystringNotPrepared` and `querystringPrepared`, differ in how they handle regular expressions for parsing query strings:

1. **`querystringNotPrepared`**:
	* Uses a regular expression (`/([^=?&]+)=?([^&]*)/g`) that is not pre-initialized.
	* The regular expression is created on the fly during each execution of the function.
2. **`querystringPrepared`**:
	* Reuses a pre-initialized regular expression variable `PARSER`.
	* This approach assumes that the regular expression has already been compiled and can be reused.

**Pros and Cons**

1. **`querystringNotPrepared`**:
	* Pros: No overhead of compiling a regular expression, simpler code.
	* Cons: Each execution creates a new regular expression, which may lead to performance issues due to repeated compilation times.
2. **`querystringPrepared`**:
	* Pros: Reuses the compiled regular expression, reducing compilation overhead and potential performance improvements.
	* Cons: Requires an initial compilation step, which can be slower than the on-the-fly approach.

**Library/Function Used**

There is no external library used in this benchmark. The functions `querystringNotPrepared` and `querystringPrepared` are defined directly in the benchmark script.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes used in this benchmark beyond the use of regular expressions.

**Other Alternatives**

If you were to implement a query string parsing function, you might consider other approaches:

1. **Using a dedicated library**: Libraries like `querystring` (available in Node.js) provide optimized implementations for parsing query strings.
2. **RegEx options**: You could experiment with different RegEx options or flags to optimize the performance of your implementation.
3. **String manipulation functions**: Some languages have built-in string manipulation functions that might be faster than using a regular expression.

Keep in mind that these alternatives would depend on the specific requirements and constraints of your project.

Related benchmarks:

querystringify pre-initialize regexp (version: 0)

Comparing performance of: not prepared vs prepared

Created: 8 years ago by: Guest

Jump to the latest result

not prepared

prepared

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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