Benchmark: startsWith - MeasureThat.net

Tests:

xxx
11+22
xcc
11+22

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
xxx
xcc

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

I'll break down the explanation into manageable sections.

**Benchmark Definition**

The benchmark definition provides metadata about the test, including its name and description. In this case, the benchmark is testing the `startsWith` method. The description "1+2" suggests that the benchmark is designed to measure the performance of a hypothetical mathematical operation.

However, since this is actually a JavaScript microbenchmark, we can infer that the intention is to compare the performance of different approaches for checking if a string starts with a certain prefix. A typical use case for `startsWith` might be in regular expression matching or string comparison.

**Options Compared**

The options being compared are not explicitly stated in the provided JSON. However, based on common scenarios where `startsWith` is used, we can make educated guesses:

1. **Simple String Comparison**: This approach checks if the first character of the string matches the prefix.
2. **Regular Expression Matching**: This approach uses a regular expression to match the prefix at the beginning of the string.

**Pros and Cons**

Here are some pros and cons for each approach:

1. **Simple String Comparison**:
	* Pros: Fast, lightweight, easy to implement.
	* Cons: May not be suitable for larger strings or more complex prefixes.
2. **Regular Expression Matching**:
	* Pros: Can handle more complex prefixes, provides better security features like Unicode support and flag options.
	* Cons: Slower, may require additional setup and configuration.

**Library and Purpose**

There is no specific library mentioned in the provided JSON. However, if we were to use regular expression matching, we might consider using a JavaScript library like `RegExp` or `regex-escape`.

**Special JS Features or Syntax**

None are explicitly mentioned in the provided JSON.

**Other Alternatives**

If you want to test other approaches for string comparison, here are some alternatives:

1. **Substring Method**: Checks if the string contains the prefix using substring.
2. **indexOf Method**: Finds the index of the first occurrence of the prefix in the string.
3. **String.prototype.includes()**: Checks if the string includes the prefix.

Each of these approaches has its own trade-offs and performance characteristics, which might be worth investigating for specific use cases.

I hope this explanation helps software engineers understand what's being tested in the benchmark!

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.9 Safari/537.36

Browser/OS: Chrome 62 on Windows

View result in a separate tab

Test name	Executions per second
xxx	130523016.0 Ops/sec
xcc	8451363.0 Ops/sec

Related benchmarks:

startsWith (version: 0)

1+2

Comparing performance of: xxx vs xcc

Created: 7 years ago by: Guest

Jump to the latest result

xxx

xcc

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):