Benchmark: JavaScript Array Slice vs Filter

Script Preparation code:

var array = new Array(100).fill(true)

Tests:

Slice
array.slice()
Filter
array.filter(v => v)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
Filter

Fastest: N/A

Slowest: N/A

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/127.0.0.0 Safari/537.36

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
Slice	17880026.0 Ops/sec
Filter	3158600.0 Ops/sec

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 on MeasureThat.net.

**What is tested?**

The provided JSON benchmark measures the performance difference between two approaches: `array.slice()` and `array.filter()`. Both methods are used to create a new array with elements that pass a certain condition. In this case, the test creates an array of 100 elements filled with `true` values.

**Options compared**

Two options are compared:

1. `array.slice()`: This method creates a shallow copy of a portion of an array.
2. `array.filter()`: This method creates a new array with all elements that pass the provided testing function.

**Pros and Cons of each approach:**

* **Array Slice (`array.slice()`)**:
	+ Pros:
		- More intuitive for developers familiar with JavaScript arrays.
		- Can be more efficient in certain cases, as it only copies the desired portion of the array.
	+ Cons:
		- Creates a new array, which can lead to increased memory allocation and garbage collection overhead.
		- May not be suitable for large datasets or performance-critical applications.
* **Array Filter (`array.filter()`)**:
	+ Pros:
		- More expressive and concise than `slice()`, as it uses a functional programming style.
		- Can be more efficient in certain cases, as it only executes the testing function for elements that pass.
	+ Cons:
		- May have higher overhead due to the execution of the testing function for each element.
		- Can lead to slower performance if the testing function is computationally expensive.

**Other considerations:**

* **JavaScript engines:** The benchmark results are specific to Chrome 127 running on Windows. Different JavaScript engines, such as SpiderMonkey (Firefox) or V8 (Node.js), may exhibit different performance characteristics for these methods.
* **Array size and data distribution:** The benchmark uses a fixed-size array of `true` values. In practice, the performance difference between `slice()` and `filter()` might be more pronounced with larger datasets or more complex filtering conditions.

**Library usage:**

There is no explicit library mentioned in the provided JSON. However, if we consider modern JavaScript features, the use of arrow functions (`=>`) in the `array.filter()` benchmark definition is a hint towards the ECMAScript 2015 (ES6) syntax.

Related benchmarks:

JavaScript Array Slice vs Filter (version: 0)

Comparing performance of: Slice vs Filter

Created: 3 years ago by: Registered User

Jump to the latest result

Slice

Filter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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