Benchmark: Regex vs split/join - space to dash

Script Preparation code:

var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxyAbcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';

Tests:

Regex
str.replace(/s+/g, "-");
Split and Join
str.split(' ').join('-');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Split and Join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser/OS: Firefox 135 on Windows

View result in a separate tab

Test name	Executions per second
Regex	6662765.5 Ops/sec
Split and Join	2313238.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which is a collection of test cases that can be executed to compare different approaches for performing a specific task. In this case, we have two test cases:

1. **Regex**: The first test case uses regular expressions (regex) to replace all occurrences of one or more whitespace characters (`s+`) with a hyphen (`-`).
2. **Split and Join**: The second test case uses the `split()` method to divide the input string into an array of substrings separated by whitespace, followed by the `join()` method to concatenate these substrings back together into a single string with hyphens in between.

**Options Compared**

In this benchmark, we have two main options being compared:

1. **Regex**: Using regular expressions to replace whitespace characters with hyphens.
2. **Split and Join**: Breaking down the input string into an array of substrings separated by whitespace and then joining them back together with hyphens.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Regex**:
	+ Pros: Can be highly efficient and flexible, allowing for complex patterns and replacements.
	+ Cons: May have performance overhead due to the complexity of regex patterns, and can be brittle if not properly tested.
* **Split and Join**:
	+ Pros: Typically has better performance than regex, as it's a simple string manipulation operation.
	+ Cons: May require more code and manual error handling to ensure correct results.

**Library Used**

In this benchmark, no libraries are explicitly mentioned. However, the `split()` method is a built-in JavaScript method that splits a string into an array of substrings based on a specified separator (in this case, whitespace).

**Special JS Feature or Syntax**

None of the test cases use any special JavaScript features or syntax.

**Other Alternatives**

If you're looking for alternative approaches to replace whitespace characters with hyphens in JavaScript, some other options include:

1. Using the `replace()` method with a callback function.
2. Utilizing a third-party library like Lodash or Ramda for string manipulation.
3. Implementing a custom solution using regular expressions or other string manipulation techniques.

It's worth noting that these alternative approaches may have different performance characteristics and trade-offs compared to the regex and split/join methods used in this benchmark.

Related benchmarks:

Regex vs split/join - space to dash (version: 0)

Comparing performance of: Regex vs Split and Join

Created: 4 years ago by: Guest

Jump to the latest result

Regex

Split and Join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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