Benchmark: truncate_array - MeasureThat.net

Script Preparation code:

var a = [1, 2, 3, 4];
var boundary = 2;

Tests:

findIndex
var a = [1, 2, 3, 4]; var boundary = 2; a.length = a.findIndex( x => x > boundary );
filter
var a = [1, 2, 3, 4]; var boundary = 2; a = a.filter( x => x <= boundary );

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
findIndex
filter

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.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Definition**

The provided JSON represents a benchmark named `truncate_array`. The purpose of this benchmark is to measure the performance difference between two approaches: using `findIndex` and using `filter`.

**Script Preparation Code**

```javascript
var a = [1, 2, 3, 4];
var boundary = 2;
```

This code creates an array `a` with four elements and sets a variable `boundary` to 2. This is the initial state of the input data for the benchmark.

**Html Preparation Code**

There is no HTML preparation code specified in this benchmark definition.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **findIndex**: This test case uses the `findIndex` method to find the index of the first element in array `a` that is greater than the `boundary`. The resulting index is then used to truncate the array.
2. **filter**: This test case uses the `filter` method to create a new array containing only the elements from `a` that are less than or equal to the `boundary`.

**Library and Purpose**

* `findIndex`: This is a built-in JavaScript method that returns the index of the first element in an array that satisfies the provided condition. In this benchmark, it's used to find the index of the first element greater than the boundary.
* `filter`: This is also a built-in JavaScript method that creates a new array with all elements that pass the test implemented by the provided function.

**Pros and Cons**

Both approaches have their pros and cons:

* **findIndex**:
	+ Pros: Can be more efficient if you only need to find the first element that satisfies the condition.
	+ Cons: May not work well for arrays with duplicate values or NaN values, as it returns the index of the first matching value.
* **filter**:
	+ Pros: Works well for arrays with duplicate values or NaN values, as it includes all matching elements in the new array. Also, it's more flexible if you need to apply multiple conditions.
	+ Cons: May be less efficient than `findIndex` when only one element needs to be found.

**Other Alternatives**

If you're looking for alternative approaches, consider:

* Using `map` and `every`: Instead of using `filter`, you could use `map` to create a new array with the desired elements and then check if all elements pass the condition using `every`.
```javascript
const result = a.map(x => x <= boundary).every(Boolean);
```
Keep in mind that this approach may be less efficient than using `filter`.

Overall, both `findIndex` and `filter` are widely used and efficient methods for achieving similar results. The choice between them depends on the specific requirements of your use case.

**Special JS Features/Syntax**

There is no special JavaScript feature or syntax mentioned in this benchmark definition.

As a general guideline, if you're new to JavaScript or unsure about the best approach for a particular problem, consider using built-in methods like `findIndex` and `filter`, which are well-documented and widely supported.

Related benchmarks:

truncate_array (version: 0)

Comparing performance of: findIndex vs filter

Created: 8 years ago by: Guest

Jump to the latest result

findIndex

filter

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):