Benchmark: Filtering Laasd1

Script Preparation code:

var list = [...Array(10000).keys()].map((index) => `ITEM_${index}`);
var val = 'ITEM_100';

Tests:

Regex case
const trimVal = val.trim(); const regex = new RegExp(`^${trimVal}`, 'i'); const x = list.filter((item) => { return trimVal !== '' ? regex.test(item) : true; });
Indexof no trime, begins with
const lowerVal = val.toLowerCase(); const x = list.filter((item) => { return val !== '' ? item.toLowerCase().indexOf(lowerVal) === 0: true; });
Indexof trim, begins with
const trimVal = val.trim().toLowerCase(); const x = list.filter((item) => { return trimVal !== '' ? item.toLowerCase().indexOf(trimVal) === 0 : true; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex case
Indexof no trime, begins with
Indexof trim, begins with

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 explanation into smaller sections to make it easier to understand.

**Benchmark Definition**

The benchmark definition is a JSON object that contains information about the test case. In this case, there are three different benchmarks:

1. **Filtering Laasd1**: This benchmark filters an array of strings using a regular expression.
2. **Regex case**: This benchmark tests the performance of the `trim()` method and its use with a regular expression.
3. **Indexof no trime, begins with**: This benchmark tests the performance of the `toLowerCase()` method in combination with the `indexOf()` method.

**Options Compared**

The three benchmarks compare different approaches to achieve a similar goal:

1. **Regex case**: Uses a regular expression to match the trimmed value at the beginning of each string.
2. **Indexof no trime, begins with**: Uses the `toLowerCase()` method and then searches for the trimmed value using the `indexOf()` method.
3. **Indexof trim, begins with**: Similar to the second option, but uses the trimmed value instead of the original value.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Regex case**:
	* Pros: More efficient for matching multiple values at once.
	* Cons: Can be slower for single-value matches due to the overhead of compiling a regular expression.
2. **Indexof no trime, begins with**:
	* Pros: Fast and efficient for searching for a value at the beginning of each string.
	* Cons: Requires two method calls (toLowerCase() and indexOf()) which can be slower than using a single regex match.
3. **Indexof trim, begins with**:
	* Pros: Similar to the second option but with fewer method calls.
	* Cons: May be slower due to the overhead of calling `trim()` on each string.

**Library**

There is no library used in this benchmark definition, so there are no additional dependencies or complexities to consider.

**Special JS Feature/Syntax**

The only special feature/syntax used in this benchmark is the use of template literals (``ITEM_${index}``) and the `const` keyword (used for variable declarations). These features are standard JavaScript syntax, but it's worth noting that they are commonly used in modern JavaScript development.

**Other Alternatives**

If you wanted to rewrite these benchmarks using alternative approaches, here are some possibilities:

1. **Using a library**: Instead of implementing the filtering logic yourself, you could use a library like Lodash or Underscore.js.
2. **Parallelizing the test**: You could use parallel processing techniques to run multiple iterations of each benchmark in parallel, which can improve performance but also increases complexity.
3. **Using a different programming language**: Depending on your goals and constraints, you might consider rewriting these benchmarks using a different programming language like Python or Java.

Keep in mind that these alternatives would likely change the nature of the benchmark significantly and may not be suitable for all use cases.

Related benchmarks:

Filtering Laasd1 (version: 0)

Comparing performance of: Regex case vs Indexof no trime, begins with vs Indexof trim, begins with

Created: 4 years ago by: Guest

Jump to the latest result

Regex case

Indexof no trime, begins with

Indexof trim, begins with

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):