Benchmark: str.match vs str.Split and for each 2

Script Preparation code:

str = "This is a benchmark to test if matching a regex is faster that splitting a string";
regex = /[0-9]/;
specialCharsList = "!@#$%^&*".split("");

Tests:

regex
regex.test(str)
split and for each
str.split("").forEach(char => { if (specialCharsList.includes(char)) { } });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
split and for each

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided benchmark and its various components.

**Benchmark Definition**

The benchmark is defined in JSON format, specifying:

* `Name`: The name of the benchmark, which is "str.match vs str.Split and for each 2".
* `Description`: An empty string, indicating that no description is provided.
* `Script Preparation Code`:
	+ Defines a variable `str` with a sample string value.
	+ Defines a regular expression `regex` with the pattern `[0-9]`.
	+ Splits the string `specialCharsList` into an array using the `split()` method and stores it in another variable.

The `Html Preparation Code` is also empty, indicating that no HTML code needs to be prepared for this benchmark.

**Individual Test Cases**

There are two test cases:

1. **"regex"`**
	* `Benchmark Definition`: The JavaScript expression `regex.test(str)`.
	* This test case measures the performance of using a regular expression with the `test()` method on the string `str`.

2. **"split and for each"`**
	* `Benchmark Definition`: The JavaScript code `str.split(\"\").forEach(char => {\r\n  if (specialCharsList.includes(char)) {\r\n  }\r\n});`.
	* This test case measures the performance of splitting the string using the `split()` method and then iterating over the resulting array using a `for...each` loop.

**Options Compared**

The benchmark compares two approaches:

1. **Regex Test**: Uses the `test()` method with a regular expression to check for a specific pattern in the string.
2. **Split and For Each**: Splits the string into an array and then iterates over it using a `for...each` loop to check if each character matches a specific list of special characters.

**Pros and Cons**

* **Regex Test**:
	+ Pros: Can be more efficient for certain use cases, as regular expressions can handle complex pattern matching.
	+ Cons: May not perform well on all types of strings or patterns, especially those that require a lot of memory allocations or function calls.
* **Split and For Each**:
	+ Pros: Can be faster for simple string operations, as it avoids the overhead of regular expression engine.
	+ Cons: Requires more code and can be slower if the loop iterates over a large array.

**Special JS Feature/ Syntax**

The benchmark uses:

* Regular expressions (`regex.test(str)`)
* `for...each` loop syntax

Note that there is no mention of special JavaScript features or syntax being used in this benchmark, apart from regular expression usage.

**Other Alternatives**

There are other alternatives to measure string operations performance, such as:

* Using the `Array.prototype.some()` method instead of `includes()`.
* Comparing the performance of using a library like Lodash's `some()` function.
* Measuring the performance of using a different string splitting algorithm, such as `indexOf()` and `substring()`.

However, the provided benchmark is a simple example to demonstrate the comparison between two common approaches to string operations in JavaScript.

Related benchmarks:

str.match vs str.Split and for each 2 (version: 0)

Comparing performance of: regex vs split and for each

Created: 2 years ago by: Guest

Jump to the latest result

regex

split and for each

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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