Benchmark: Array split vs string substring

Script Preparation code:

var s1 = "foo.bar";
var s2 = "foo";

Tests:

Array.split
var n1 = s1.split(".")[0]; var n2 = s2.split(".")[0];
Substring
var n1 = s1.substring(0, s1.indexOf(".")); var n2 = s2.substring(0, s2.indexOf("."));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.split
Substring

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 dive into the world of JavaScript microbenchmarks!

**Benchmark Definition**
The provided JSON represents a simple benchmark that compares two approaches to extract a substring from a string: `Array.split()` and `String.substring()`. The benchmark definition specifies:

* Two input strings, `s1` and `s2`, which are defined in the "Script Preparation Code".
* Two test cases:
	+ `Test Case 1: Array.split`: Extracts the first element of an array created by splitting the string using a dot (`.`) as the separator.
	+ `Test Case 2: Substring`: Extracts a substring from the original string using the same dot (`.`) separator.

**Options Compared**
The benchmark compares two approaches:

* `Array.split()`: Splits the input string into an array and then extracts the first element.
* `String.substring()`: Directly extracts a substring from the original string.

**Pros and Cons**

* **`Array.split()`**:
	+ Pros: Can be used to split strings into arrays, which can be useful for certain tasks.
	+ Cons: Creates an intermediate array, which may incur additional memory allocation and garbage collection overhead.
* `String.substring()`: Directly extracts a substring from the original string.

+ Pros: More efficient, as it avoids creating an intermediate array.
	+ Cons: May not be suitable for all use cases, such as splitting strings into arrays or handling edge cases.

**Library**
In this benchmark, there is no explicit library used. However, it's worth noting that `Array.prototype.split()` and `String.prototype.substring()` are built-in methods in JavaScript, which means they don't rely on any external libraries.

**Special JS Feature/ Syntax**
There doesn't appear to be any special JavaScript feature or syntax being tested in this benchmark. The focus is solely on comparing the performance of two approaches: `Array.split()` and `String.substring()`.

**Other Alternatives**

If you need to split strings into arrays, you might consider using regular expressions (e.g., `s1.match(/\w+/)`). Alternatively, if you need to extract substrings from strings, you could use other methods like `String.prototype.indexOf()` or `String.prototype.lastIndexOf()`, depending on your specific requirements.

Keep in mind that these alternatives may not be as efficient as `Array.split()` or `String.substring()` for this particular benchmark.

Latest run results:

Run details: (Test run date: 2 days ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 131 on Android

View result in a separate tab

Test name	Executions per second
Array.split	963967.9 Ops/sec
Substring	725080.1 Ops/sec

Related benchmarks:

Array split vs string substring (version: 0)

Comparing performance of: Array.split vs Substring

Created: 6 years ago by: Registered User

Jump to the latest result

Array.split

Substring

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):