Benchmark: Performance Test: substring vs substring over limit

Script Preparation code:

var string = "I am the god of hellfire, and I bring you..."

Tests:

substring
var substring = string.substring(17, 25);
substring over limit
var substring = string.substring(17, 500);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
substring over limit

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/97.0.4692.99 Safari/537.36

Browser/OS: Chrome 97 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
substring	15123483.0 Ops/sec
substring over limit	15395450.0 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 benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that contains two test cases:

1. `"Benchmark Definition": "var substring = string.substring(17, 25);"`, which tests the performance of `string.substring()` with a fixed range (from index 17 to 25).
2. `"Benchmark Definition": "var substring = string.substring(17, 500);"`, which tests the performance of `string.substring()` with an arbitrary limit (from index 17 to 500).

**Options Compared**

In this benchmark, we have two options being compared:

1. **Fixed range**: The first test case uses a fixed range (`substring(17, 25)`) to extract a substring from the input string.
2. **Arbitrary limit**: The second test case uses an arbitrary limit (`substring(17, 500)`), which can lead to unpredictable performance behavior.

**Pros and Cons**

1. **Fixed range**:
	* Pros: Predictable performance, as the range is fixed and known in advance.
	* Cons: May not be representative of real-world scenarios, where substring lengths can vary greatly.
2. **Arbitrary limit**:
	* Pros: More realistic representation of real-world usage, where substring lengths can be arbitrary.
	* Cons: Performance behavior can be unpredictable, as the actual limit is unknown.

**Library Used**

In this benchmark, there is no explicit library mentioned. However, the `string` object is used, which is a built-in JavaScript object that provides various string methods, including `substring()`. The `string` object is likely assumed to be part of the standard JavaScript API.

**Special JS Feature or Syntax**

There is no special JavaScript feature or syntax explicitly being tested in this benchmark. However, it's worth noting that the use of `string.substring()` itself is a general-purpose JavaScript function that can be used in various contexts.

**Other Alternatives**

If you wanted to test substring-related performance, you might consider alternatives such as:

* Using regular expressions (e.g., `string.match()`, `string.replace()`) instead of `substring()`.
* Comparing different types of substrings (e.g., extracting a specific character sequence, using Unicode escape sequences).
* Testing the performance of substring extraction in different contexts (e.g., parsing JSON strings, working with binary data).

In general, when testing JavaScript performance benchmarks like this one, it's essential to consider various scenarios and edge cases to ensure that your results are representative and reliable.

Related benchmarks:

Performance Test: substring vs substring over limit (version: 0)

Comparing performance of: substring vs substring over limit

Created: 2 years ago by: Guest

Jump to the latest result

substring

substring over limit

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):