Benchmark: startswith length

Script Preparation code:

const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/"

Tests:

short
const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/" str.startsWith("h")
long
const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/" str.startsWith("https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
short
long

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser/OS: Chrome 84 on Mac OS X 10.15.5

View result in a separate tab

Test name	Executions per second
short	821418752.0 Ops/sec
long	3239501.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark definition provides information about the test case, including:

* **Name**: The name of the benchmark, which is "startswith length" in this case.
* **Description**: An empty description field, indicating that no detailed explanation for the benchmark is provided.
* **Script Preparation Code**: A line of JavaScript code that sets up a string variable `str` to contain a URL. The string has two newline characters (`\r\n`) at the end.

**Individual Test Cases**

The individual test cases are defined in an array:

* The first test case, "short", uses the following benchmark definition:
```javascript
const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/"str.startsWith("h")
```
This test case checks if the `str` variable starts with the substring `"h"`. The code is intentionally short, which is why it's named "short".

* The second test case, "long", uses the following benchmark definition:
```javascript
const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/"str.startsWith("https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/")
```
This test case checks if the `str` variable starts with a longer substring, which is also part of the original URL.

**Other Considerations**

In both test cases, the `startsWith()` method is used to check if the string `str` matches the specified prefix. The method takes two arguments: the prefix and an optional third argument (not used in this case).

The use of `startsWith()` suggests that the benchmark is measuring the performance of this method on various input strings.

**Library/Extension Considerations**

In neither test case is a specific library or extension mentioned, so it's likely that these are built-in JavaScript functions.

However, if we look at the original string definition:
```javascript
const str = "https://firebasestorage.googleapis.com/v0/b/a-sketch-a-day-207420.appspot.com/o/"
```
We can see that this string contains a special character: `\r\n`, which is a newline sequence. This might be relevant if the benchmark aims to test the handling of newline sequences in the `startsWith()` method.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in these test cases, so we can proceed without further discussion on that front.

**Alternatives**

For measuring performance and comparing different approaches, some alternatives to MeasureThat.net include:

* **Benchmark.js**: A popular benchmarking library for Node.js.
* **Benchmark**: A simple benchmarking utility for JavaScript.
* **WebPageTest**: A web performance analysis tool that can also be used to run benchmarks.

These tools offer similar functionality to MeasureThat.net and can be used to test various aspects of JavaScript performance.

Related benchmarks:

startswith length (version: 0)

Comparing performance of: short vs long

Created: 4 years ago by: Guest

Jump to the latest result

short

long

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):