Benchmark: Array split vs string substring after

Script Preparation code:

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

Tests:

Array.split
var n1 = s1.split(".").pop(); var n2 = s2.split(".").pop();
Substring
var n1 = s1.substring(s1.indexOf(".")+1); var n2 = s2.substring(s2.indexOf(".")+1);

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

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.split	5031603.5 Ops/sec
Substring	4372673.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year 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 extract the last part of a string: using `Array.split()` with `pop()`, and using the `substring` method.

**Approaches Compared**

1. **Array Split with Pop**: This approach uses the `split()` method to split the input string into an array, and then uses the `pop()` method to get the last element of the array.
2. **Substring**: This approach uses the `indexOf()` method to find the index of the last dot (`.`) in the input string, and then uses the `substring` method to extract the substring starting from the next character.

**Pros and Cons**

* **Array Split with Pop**:
	+ Pros: Simple and efficient way to get the last part of a string.
	+ Cons: May not be as fast as other approaches for very large strings, as it creates an array and then pops the last element.
* **Substring**:
	+ Pros: More flexible than `Array.split()` with `pop`, as it can extract any substring starting from a specific index.
	+ Cons: May be slower than `Array.split()` with `pop` for small strings, since it involves finding the index of the dot (`.`) using `indexOf()`.
* **Other Considerations**:
	+ Both approaches assume that the input string has at least one dot (`.`). If this is not guaranteed, additional checks may be necessary.

**Library/Functionality Used**

None. This benchmark only uses built-in JavaScript functions and methods.

**Special JS Feature/Syntax**

No special features or syntax are being tested in this benchmark.

**Alternative Approaches**

Other approaches to extract the last part of a string include:

* Using `lastIndexOf()` instead of `indexOf()`
* Using a regular expression with the `exec` method
* Using a library like jQuery's `.split()` and `.slice()` methods

These alternative approaches may have their own pros and cons, depending on the specific use case.

Related benchmarks:

Array split vs string substring after (version: 0)

Comparing performance of: Array.split vs Substring

Created: 2 years ago by: Registered User

Jump to the latest result

Array.split

Substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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