Benchmark: Test regex vs split,splice,join

Script Preparation code:

var str = '11.04.09.100.98';

Tests:

Regex
str.replace(/\.\d{1,3}$/, '')
Split and Join
str.split('.').splice(0,3).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: 3 years ago)

User agent: Mozilla/5.0 (Linux; Android 11; Mi A3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.74 Mobile Safari/537.36

Browser/OS: Chrome Mobile 95 on Android

View result in a separate tab

Test name	Executions per second
Regex	1778194.0 Ops/sec
Split and Join	643555.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this benchmark.

**What is being tested?**

The benchmark is comparing the performance of two approaches to remove the last three digits from a string: using regular expressions (`regex`) and using `split`, `splice`, and `join` methods.

**Options compared**

There are two options being compared:

1. **Regex approach**: This method uses a regular expression to match the last three digits (`\\d{1,3}`) in the string and replaces them with an empty string.
2. **Split, splice, join approach**: This method splits the string into an array using `.` as the separator, removes the first three elements using `splice(0, 3)`, and then joins the remaining elements back into a string using `join('.')`.

**Pros and cons of each approach**

1. **Regex approach**
	* Pros:
		+ More concise and expressive
		+ Can be used for more complex pattern matching
	* Cons:
		+ May be slower due to the overhead of compiling regular expressions
		+ May not work as expected if the input string is malformed
2. **Split, splice, join approach**
	* Pros:
		+ May be faster since it involves only basic array operations
		+ Less error-prone than regex patterns
	* Cons:
		+ More verbose and less expressive than regex patterns
		+ May not work as expected if the input string is malformed

**Other considerations**

1. **Library usage**: There is no explicit library mentioned in the benchmark definition or test cases.
2. **Special JS feature or syntax**: There are no special features or syntax used in this benchmark.

**Alternatives**

If you wanted to compare other approaches, some alternatives could include:

* Using a different string manipulation method, such as `substr` or `substring`
* Comparing the performance of different regex patterns
* Using a library like Lodash for string manipulation
* Comparing the performance of compiled vs. interpreted code

In summary, this benchmark is designed to compare the performance of two approaches to remove the last three digits from a string: using regular expressions and using `split`, `splice`, and `join` methods. The regex approach has its advantages in terms of conciseness and expressiveness, but may be slower due to compilation overhead. The split, splice, join approach is more straightforward and less error-prone, but less concise and expressive.

Related benchmarks:

Test regex vs split,splice,join (version: 0)

Comparing performance of: Regex vs Split and Join

Created: 3 years ago by: Guest

Jump to the latest result

Regex

Split and Join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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