Benchmark: splitt - MeasureThat.net

Tests:

split
for (let i = 0; i < 20000; i++) { const str = "2023-08-21_06-06-05;LAeq:94.0 LCeq:94.0 LCpk:97.7"; const firstSplit = str.split(" "); const afterSecondSplit = firstSplit[1].split(":")[1]; }
substring
for (let i = 0; i < 20000; i++) { const str = "2023-08-21_06-06-05;LAeq:94.0 LCeq:94.0 LCpk:97.7"; let s = str.search("LCeq") + 5; const sub = str.substring(s, s + 4); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and explain what's being tested.

**Benchmark Overview**

MeasureThat.net is a platform that allows users to create and run JavaScript microbenchmarks. The goal is to compare different approaches for performing specific tasks, such as splitting strings or extracting substrings.

**Test Cases**

There are two test cases:

1. **"split"`**
The benchmark definition is a JavaScript `for` loop that iterates 20,000 times:
```javascript
for (let i = 0; i < 20000; i++) {
  const str = "2023-08-21_06-06-05;LAeq:94.0 LCeq:94.0 LCpk:97.7";
  const firstSplit = str.split(" ");
  const afterSecondSplit = firstSplit[1].split(":")[1];
}
```
This code splits the string `str` into three parts using two different `split()` methods:
	* The first `split()` method splits the entire string on whitespace (`" "`), which produces an array with a single element containing the original string.
	* The second `split()` method takes a colon (`:`) as the separator and extracts the substring after the second occurrence of that colon.

2. **"substring"`**
The benchmark definition is another JavaScript `for` loop that iterates 20,000 times:
```javascript
for (let i = 0; i < 20000; i++) {
  const str = "2023-08-21_06-06-05;LAeq:94.0 LCeq:94.0 LCpk:97.7";
  let s = str.search("LCeq") + 5;
  const sub = str.substring(s, s + 4);
}
```
This code uses the `search()` method to find the index of the string "LCeq" in the input string `str`, adds 5 to that index, and then extracts a substring using the `substring()` method.

**Options Compared**

The two test cases compare different approaches for achieving the same result:

* **Splitting strings**: The first test case uses two separate `split()` methods to split the string into three parts. The second test case uses a single `substring()` method to extract the desired substring.
* **Substring extraction**: Both test cases use a similar approach, but with different methods ( `search()` + `substring()`, vs. 2 separate `split()` methods).

**Pros and Cons**

Here's a brief analysis of each approach:

* **Splitting strings using two separate `split()` methods**:
	+ Pros: Simple and straightforward.
	+ Cons: May incur additional overhead due to multiple function calls.
* **Using `search()` + `substring()` for substring extraction**:
	+ Pros: More efficient, as it avoids creating intermediate arrays or objects.
	+ Cons: May be less intuitive for some developers.

**Other Considerations**

* The benchmark uses a relatively small input string (`str`), which may not accurately reflect performance differences in larger inputs.
* Both test cases use `for` loops with a fixed number of iterations, which can mask other optimization techniques that might be more effective at higher iteration counts.
* The use of `let` instead of `const` for the variable `s` is unlikely to affect performance, but it's an interesting choice.

**Library Usage**

There are no libraries explicitly mentioned in the benchmark definitions. However, the `search()` method is a built-in JavaScript function that searches for a pattern in a string and returns its starting index.

**Special JS Features or Syntax**

None of the provided code snippets use any special JavaScript features or syntax beyond what's standard in modern JavaScript (ES6+).

I hope this explanation helps software engineers understand the benchmark test cases and their underlying assumptions!

Related benchmarks:

splitt (version: 0)

Comparing performance of: split vs substring

Created: 2 years ago by: Guest

Jump to the latest result

split

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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