Benchmark: JS Array Slice vs Spread

Tests:

Array Slice
const params = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const others = params.slice();
Array Spread
const params = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const others = [...params];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array Slice
Array Spread

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 what is being tested in the provided benchmark.

**What is being tested?**

The benchmark tests two approaches for creating a copy of an array in JavaScript:

1. `Array.prototype.slice()`: This method creates a new array that contains a subset of elements from the original array.
2. Array spread operator (`...`): This operator creates a new array by spreading the elements of the original array.

**Options compared**

The benchmark compares these two approaches, testing which one is faster and more efficient for creating a copy of an array with a large number of elements (in this case, 10 elements).

**Pros and Cons of each approach:**

1. `Array.prototype.slice()`:
	* Pros:
		+ Widely supported and well-documented.
		+ Returns a new array object, allowing for modification without affecting the original array.
	* Cons:
		+ Can be slower than the spread operator for large arrays due to the overhead of creating a new array object.
2. Array spread operator (`...`):
	* Pros:
		+ Faster and more concise than `slice()`.
		+ Returns a new array object, allowing for modification without affecting the original array.
	* Cons:
		+ Less widely supported (requires modern JavaScript environments).
		+ Can be less predictable and easier to mistake due to its brevity.

**Library used**

None, this benchmark uses only built-in JavaScript features.

**Special JS feature or syntax**

The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It's not supported in older browsers or environments that don't support modern JavaScript.

**Other alternatives**

For creating an array copy, you could also use the `Array.from()` method, which was introduced in ES6:
```javascript
const params = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const others = Array.from(params);
```
Alternatively, you could use the `concat()` method:
```javascript
const params = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const others = params.concat();
```
However, these alternatives may not be as efficient or concise as the spread operator.

In summary, this benchmark tests the performance and efficiency of two approaches for creating an array copy in JavaScript: `Array.prototype.slice()` and the array spread operator (`...`). The spread operator is faster and more concise, but less widely supported.

Related benchmarks:

JS Array Slice vs Spread (version: 1)

Comparing performance of: Array Slice vs Array Spread

Created: 6 years ago by: Registered User

Jump to the latest result

Array Slice

Array Spread

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):