Benchmark: Slice vs toSpliced

Script Preparation code:

var arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
var numberToRemove = 2;

Tests:

Slice
arr.slice(numberToRemove)
toSpliced
arr.toSpliced(0, numberToRemove)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Slice
toSpliced

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 29 days ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_7_12 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6.1 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 16 on iOS 16.7.12

View result in a separate tab

Test name	Executions per second
Slice	43052904.0 Ops/sec
toSpliced	18724310.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this benchmark.

**Benchmark Definition**

The provided JSON defines a benchmark with two test cases: `Slice` and `toSpliced`. The script preparation code creates an array `arr` containing seven elements, including the number to be removed (`numberToRemove = 2`). This setup is used to compare the performance of two different approaches for removing an element from an array.

**Options Compared**

Two options are being compared:

1. **Slice**: Using the `slice()` method to create a new array with all elements except the one at the specified index.
2. **toSpliced**: Using the `toSpliced()` method (not a standard JavaScript method) to remove an element from the original array.

**Pros and Cons**

1. **Slice**:
	* Pros: widely supported, easy to understand, and fast for most use cases.
	* Cons: creates a new array, which can be memory-intensive for large arrays.
2. **toSpliced**: Not a standard JavaScript method, so its implementation may vary across browsers or implementations. It's not clear how it works without looking at the implementation code.

**Other Considerations**

The benchmark doesn't account for other factors that might affect performance, such as:

* Array size: The test uses an array with seven elements. Increasing the size of the array could significantly impact performance.
* Browser support: The test only checks Chrome 129 on Windows. Other browsers and operating systems may have different performance characteristics.

**Library and Special JS Features**

The `toSpliced()` method is not a standard JavaScript method, so it's likely that this benchmark is checking for specific browser or library implementation of this method. Without seeing the implementation code, it's difficult to say how it works or which libraries support it.

If you're interested in using this benchmark, make sure your environment supports the `slice()` and `toSpliced()` methods.

**Alternatives**

Other alternatives for removing elements from an array include:

* Using a loop: `arr.splice(index, 1);`
* Using `filter()`: `[...arr].filter((element) => element !== numberToRemove)`
* Using `every()` or `some()` with a callback function to filter the array

In general, using `slice()` is often the most efficient and convenient way to remove an element from an array.

I hope this explanation helps!

Related benchmarks:

Slice vs toSpliced (version: 0)

Comparing performance of: Slice vs toSpliced

Created: 2 years ago by: Guest

Jump to the latest result

Slice

toSpliced

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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