Benchmark: check vs replace 2

Tests:

check first
let s = "//test.org/test/test/25187960#25187960"; let replced = ""; if (s.startsWith("//")) { replaced = s.replace("//test.org"); }
replace
let s = "//test.org/test/test/25187960#25187960"; let replced = ""; replaced = s.replace("//test.org");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
check first
replace

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the JavaScript microbenchmark on MeasureThat.net.

**What is tested:**
The benchmark tests two different approaches for removing a URL prefix from a string in JavaScript:

1. **Check first**: This approach checks if the input string starts with a specific prefix (in this case, "//test.org") using the `startsWith()` method.
2. **Replace**: This approach uses the `replace()` method to remove the prefix.

**Options compared:**
The benchmark compares the performance of these two approaches on different devices and browsers.

**Pros and cons of each approach:**

* **Check first (startsWith())**:
	+ Pros:
		- More readable code, as it clearly states the intention of checking for a specific prefix.
		- Can be more efficient if the input string is very large, since `startsWith()` only checks the beginning of the string.
	+ Cons:
		- May be slower than the replace approach for small strings or when the prefix is common in the input data.
* **Replace (replace())**:
	+ Pros:
		- Can be faster for small strings or when the prefix is common in the input data, since it only needs to search and replace a single prefix.
	+ Cons:
		- Less readable code, as it uses a regular expression under the hood to remove the prefix.

**Library usage:**
The benchmark does not use any external libraries, but it may use some built-in JavaScript features like `startsWith()` and `replace()`.

**Special JS feature or syntax:**
There is no special JavaScript feature or syntax used in this benchmark. The code only uses standard JavaScript constructs like variables, strings, and methods.

**Other alternatives:**
If the replace approach is not efficient enough for your use case, you might consider using other techniques to remove prefixes, such as:

* Using a regular expression with the `g` flag (global match) to remove all occurrences of the prefix.
* Using a string manipulation library like String.prototype.replace() with a custom replacement function.

In terms of programming language features, you could also consider using more functional programming style approaches, such as using arrow functions or the `map()` method to transform strings.

However, for this specific benchmark, the check first and replace approaches are likely to be sufficient, and it's interesting to see how they compare in terms of performance.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

Browser/OS: Chrome 113 on Windows

View result in a separate tab

Test name	Executions per second
check first	5853870.0 Ops/sec
replace	5897813.0 Ops/sec

Related benchmarks:

check vs replace 2 (version: 0)

Comparing performance of: check first vs replace

Created: one year ago by: Guest

Jump to the latest result

check first

replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):