Benchmark: replace vs split/join v2

Tests:

replace
const rib = '4444333322221111'; const any4CharsGroupExceptLastOne = /.{4}(?<!$)/g; const nonBreakingHyphen = '‑'; const addHyphenToGroup = `$&${nonBreakingHyphen}`; `${rib}`.replace(any4CharsGroupExceptLastOne, addHyphenToGroup);
split/join
const rib = '4444333322221111'; const NON_BREAKING_HYPHEN = '‑'; rib.match(/.{4}/g).join(NON_BREAKING_HYPHEN);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace
split/join

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to replace or split strings in JavaScript: `replace()` and using `split()` followed by `join()`. The goal is to measure which approach is faster for this specific use case.

**Options Compared**

Two options are compared:

1. **`replace()`**: This method uses a regular expression to find all occurrences of a pattern (in this case, groups of 4 characters) and replaces them with another string (with hyphens inserted).
2. **Split/Join**: This approach splits the input string into individual groups of 4 characters using `split()`, and then joins them together with a hyphen separator using `join()`.

**Pros and Cons**

* **`replace()`**:
	+ Pros: Simple, efficient, and likely to be optimized by JavaScript engines.
	+ Cons: May not be as flexible or customizable as other approaches, and may have limitations with certain types of inputs (e.g., non-ASCII characters).
* **Split/Join**:
	+ Pros: More flexible and customizable than `replace()`, can handle a wide range of input types and formats.
	+ Cons: May be slower due to the overhead of creating multiple arrays, concatenating strings, and joining them together.

**Other Considerations**

* **Regular Expressions**: The benchmark uses regular expressions to match groups of 4 characters. Regular expressions can be powerful but also complex and performance-intensive.
* **String Concatenation**: In both approaches, string concatenation is used to build the output string. This can lead to performance issues if done excessively.

**Library/Functionality Used**

None are explicitly mentioned in the benchmark definition or test cases.

**Special JS Features/Syntax**

None are explicitly mentioned in the benchmark definition or test cases.

Now, let's look at the individual test cases:

1. The first test case uses `replace()` to replace groups of 4 characters with hyphens.
2. The second test case uses `split()` followed by `join()` to achieve the same result as the first test case.

Both approaches are relatively simple and straightforward, but the Split/Join approach may be slower due to its additional overhead.

**Alternatives**

Other alternatives for replacing or splitting strings in JavaScript include:

* Using other regular expression methods (e.g., `match()`, `matchAll()`).
* Using string manipulation functions like `indexOf()`, `slice()`, and `substring()`.
* Using libraries like Lodash, which provides various utility functions for working with strings.
* Using alternative programming paradigms, such as using loops or array transformations instead of string manipulation.

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/91.0.4472.77 Safari/537.36

Browser/OS: Chrome 91 on Windows

View result in a separate tab

Test name	Executions per second
replace	2053047.8 Ops/sec
split/join	2223874.8 Ops/sec

Related benchmarks:

replace vs split/join v2 (version: 0)

replace vs split/join

Comparing performance of: replace vs split/join

Created: 3 years ago by: Guest

Jump to the latest result

replace

split/join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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