Benchmark: Split string vs Split regex perfs

Script Preparation code:

var txt = 'path.to.split.into.array';

Tests:

String
let result = txt.split('.');
Regex
let result = txt.split(/\./);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String
Regex

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 what's being tested in this JavaScript microbenchmark.

**Benchmark Goal:**
The goal of this benchmark is to compare the performance of two approaches: splitting a string using the `.split()` method versus splitting a string using a regular expression (`/regex/`).

**Options Being Compared:**

1. **Splitting with `.split()`**: This method uses the `Array.prototype.split()` function, which returns an array of substrings split at each occurrence of a specified separator (in this case, a dot `.`).
2. **Splitting with Regular Expression `/regex/`**: This method uses a regular expression to match and split the string. The `/` characters denote the start and end of the regex pattern.

**Pros and Cons of Each Approach:**

* `.split()`:
	+ Pros:
		- Faster, as it avoids the overhead of compiling a regular expression.
		- More efficient for large strings, as it only requires a single pass through the string.
	+ Cons:
		- Less flexible, as you can't specify custom regex patterns or flags.
* Regular Expression `/regex/`:
	+ Pros:
		- More flexible, allowing you to specify custom regex patterns and flags (e.g., `g`, `m`, etc.).
		- Can be useful for more complex string manipulation tasks that require a high degree of control.
	+ Cons:
		- Slower, as it involves compiling the regular expression beforehand, which can add overhead.
		- Less efficient for large strings, as it requires multiple passes through the string.

**Library and Special JS Features:**
There are no libraries explicitly mentioned in this benchmark. However, regular expressions do use JavaScript's built-in regex engine, which is a core part of the language.

**Other Considerations:**

* The `txt` variable is initialized with a specific string `'path.to.split.into.array'`, which might be used to control the input size or format for testing purposes.
* The benchmark seems to focus on comparing the performance of these two approaches, but it's also possible that other factors like memory usage or garbage collection overhead are being implicitly tested.

**Alternatives:**

If you want to compare other string splitting methods or explore different regex patterns, you could consider adding additional test cases. Some alternatives might include:

* Using `String.prototype.split()` (which is equivalent to `.split()`, but uses the `String` prototype instead)
* Using a custom implementation of string splitting using loops and conditionals
* Comparing performance with other JavaScript engines or versions
* Exploring the impact of input size, string complexity, or character encoding on benchmark results

Related benchmarks:

Split string vs Split regex perfs (version: 0)

Comparing performance of: String vs Regex

Created: 2 years ago by: Guest

Jump to the latest result

String

Regex

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):