Benchmark: Slice vs Filter - MeasureThat.net

Script Preparation code:

var arr = Array.from(Array(1000).keys());
var arr2;
var target = Math.random() * 1000;

Tests:

filter
arr2 = arr.filter(function(i) { return i !== target; });
slice
var index = arr.indexOf(target); arr2 = arr.slice(0,index).concat(arr.slice(index+1));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
filter
slice

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 break down the provided benchmark and its results.

**Benchmark Definition**

The benchmark tests two approaches to create a new array `arr2` from an original array `arr`. The test cases are:

1. **Filter**: Create a new array by filtering out elements that do not match a specified target value using the `filter()` method.
2. **Slice**: Create a new array by slicing the original array into two parts and concatenating them.

**Options Compared**

In this benchmark, we have two options being compared:

* **Filter**
* **Slice**

Let's examine each option:

### Filter

The `filter()` method returns a new array with all elements that pass the test implemented by the provided function. In this case, the test function takes an element `i` and returns `true` if it does not match the target value.

Pros:

* Efficient for large datasets since only elements that match the condition are included in the resulting array.
* Can be used to create new arrays with a specific subset of elements.

Cons:

* May have higher overhead due to the creation of an intermediate array and potential function calls.

### Slice

The `slice()` method creates a shallow copy of a portion of an array, returning a new array object.

Pros:

* Efficient for large datasets since only a portion of the original array is copied.
* Can be used to create new arrays with a specific subset of elements.

Cons:

* May have higher overhead due to the creation of an intermediate array and potential function calls.
* Does not preserve the original array's structure if it contains nested arrays or objects.

**Other Considerations**

Both `filter()` and `slice()` methods can be affected by factors such as:

* Array length: Longer arrays may lead to higher overhead due to increased memory allocation and copying.
* Target value distribution: If the target value is present in a non-uniform pattern within the array, one method might perform better than the other.

**Library Usage**

There are no libraries used in this benchmark.

**Special JS Features or Syntax**

None of the code snippets in this benchmark utilize any special JavaScript features or syntax. The `filter()` and `slice()` methods are standard array methods implemented by most modern browsers and environments.

**Alternative Approaches**

Other alternative approaches to creating a new array from an original array include:

* Using `forEach()` with a callback function
* Using `map()`
* Using `reduce()`
* Implementing custom loop or iteration logic

However, these alternatives are not typically used in practice due to performance and readability considerations.

I hope this explanation helps software engineers understand the benchmark and its results!

Related benchmarks:

Slice vs Filter (version: 0)

Comparing performance of: filter vs slice

Created: 9 years ago by: Guest

Jump to the latest result

filter

slice

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):