Benchmark: fastest start width

HTML Preparation code:

<script>
  const key = 'onclick'
</script>

Tests:

check 1 and 2
if (key[0] === 'o' && key[1] === 'n') {}
startsWith
if(key.startsWith()) {}
indexOf
if(key.indexOf('on')) {}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
check 1 and 2
startsWith
indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36

Browser/OS: Chrome 91 on Windows

View result in a separate tab

Test name	Executions per second
check 1 and 2	6281505.5 Ops/sec
startsWith	12026728.0 Ops/sec
indexOf	11379033.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain the benchmark being measured on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a JSON object that describes what is being tested. In this case, it's a simple JavaScript script that checks if a specific string `key` starts with or contains certain characters.

**Options Compared**

There are three options being compared:

1. **String Index Of**: This option uses the `indexOf()` method to check if `key` contains the substring `'on'`.
2. **String Starts With**: This option uses the `startsWith()` method to check if `key` starts with the string `'o'` and `'n'` simultaneously.
3. **Simple Comparison**: This option uses a simple comparison (`if (key[0] === 'o' && key[1] === 'n')`) to check if `key` contains both characters.

**Pros and Cons of Each Approach**

Here's a brief overview of the pros and cons of each approach:

* **String Index Of**: This method is generally faster and more efficient than the other two options. However, it can be slower for longer strings because it has to search through the entire string.
* **String Starts With**: This method is also relatively fast but may be slower than `indexOf()` for very long strings. Additionally, it's not suitable for checking if a string contains multiple substrings simultaneously.
* **Simple Comparison**: This approach is likely to be the slowest of the three because it involves two separate comparisons (`key[0] === 'o'` and `key[1] === 'n'`). However, it can still provide useful insights into the behavior of JavaScript engines.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition. The script uses built-in JavaScript methods like `indexOf()`, `startsWith()`, and array indexing (`key[0]`).

**Special JS Feature or Syntax**

The benchmark doesn't use any special JavaScript features or syntax that would require additional explanation.

**Other Alternatives**

If you were to add more options to the benchmark, some alternative approaches could include:

* Using regular expressions (e.g., `new RegExp('on').test(key)`)
* Using a loop to iterate through the string characters
* Using a more advanced indexing method, such as `String.prototype.indexOf()`
* Comparing the execution times of different string comparison methods in JavaScript engines

Overall, this benchmark provides a simple and useful test case for comparing the performance of different string comparison methods in JavaScript.

Related benchmarks:

fastest start width (version: 0)

Comparing performance of: check 1 and 2 vs startsWith vs indexOf

Created: 3 years ago by: Guest

Jump to the latest result

check 1 and 2

startsWith

indexOf

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):