Benchmark: substring vs split datetime with longer date

Script Preparation code:

var year = '2004-11-01';

Tests:

split
console.log(year.split('-')[0]);
substring
console.log(year.substring(0,4))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
substring

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.50

Browser/OS: Chrome 110 on Windows

View result in a separate tab

Test name	Executions per second
split	226183.7 Ops/sec
substring	221571.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and benchmark setup to understand what is being tested.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches: using `split()` and `substring()`. The purpose of this test is likely to determine which method is faster for extracting a specific part of a date string (in this case, only the year).

**Options Compared**

There are two options compared:

1. **`split()`**: This function splits a string into an array of substrings based on a specified separator. In this test, it's used to split the date string at the '-' character.
2. **`substring()`**: This method returns a new string that is part of the original string, starting from a given start index and with a specified length.

**Pros and Cons**

* **`split()`**:
	+ Pros: flexible, can handle multiple separators, easy to use.
	+ Cons: may create unnecessary arrays, slower for large strings.
* **`substring()`**: 
	+ Pros: direct access to specific part of string, less memory overhead.
	+ Cons: limited flexibility, only works with single separator.

**Library and Special JS Feature**

There is no library explicitly mentioned in the benchmark setup. However, the use of `split()` and `substring()` suggests that JavaScript's built-in String methods are being utilized.

No special JS features or syntax (like async/await, Promises, etc.) are used in this test case.

**Other Alternatives**

If you wanted to compare performance between these two approaches, you could consider using other libraries or methods, such as:

* Using a regular expression with `exec()` and capturing groups.
* Employing a dedicated date parsing library (like moment.js).
* Utilizing a String manipulation library like underscore.js.

Keep in mind that the choice of alternative will depend on your specific requirements and use case.

Related benchmarks:

substring vs split datetime with longer date (version: 0)

Comparing performance of: split vs substring

Created: one year ago by: Guest

Jump to the latest result

split

substring

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):