Benchmark: Array.prototype.slice vs spread operator but using params

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.slice
spread operator

Fastest: N/A

Slowest: N/A

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

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Let's break down the benchmark and explain what's being tested, compared, and their pros and cons.

**What is being tested?**

The benchmark compares two approaches to create a copy of an array in JavaScript:

1. `Array.prototype.slice()`
2. The new ES6 spread operator `[...params]`

**Options compared:**

* **`Array.prototype.slice()`**: This method returns a shallow copy of the original array, creating a new array object with references to the same elements as the original array.
* **The new ES6 spread operator `[...params]`**: This syntax creates a new array by iterating over each element in `params` and adding it to a new array.

**Pros and Cons:**

* **`Array.prototype.slice()`**:
	+ Pros: Widely supported, efficient, and simple to implement.
	+ Cons: Can be slow for large arrays, as it requires creating a new array object with references to the same elements as the original array. Also, it creates an intermediate array, which can lead to memory allocation overhead.
* **The new ES6 spread operator `[...params]`**:
	+ Pros: Fast and efficient, as it creates a new array by iterating over each element in `params`. It also avoids creating an intermediate array.
	+ Cons: Less widely supported, especially in older browsers. The syntax can be unfamiliar to some developers.

**Library and its purpose:**

There is no library used in this benchmark. The focus is solely on comparing the two JavaScript methods.

**Special JS feature or syntax:**

The benchmark uses the new ES6 spread operator, which was introduced in ECMAScript 2015 (ES6). It's a shorthand way to create a new array by iterating over each element in an existing array or other iterable.

**Other alternatives:**

If you want to avoid the spread operator and still create a copy of an array, you can use the `Array.prototype.concat()` method:
```
var params = [ "hello", true, 7 ];
var other = Array.prototype.concat.call([], params);
```
Alternatively, you can use the `Array.from()` method:
```
var params = [ "hello", true, 7 ];
var other = Array.from([ params ], (item) => item);
```
However, these approaches are generally less efficient and more verbose than using the spread operator.

The benchmark results show that Chrome 93 is faster with both `Array.prototype.slice()` and the new ES6 spread operator. This suggests that the performance difference between these two methods is relatively small, but still worth considering when writing JavaScript code.

Related benchmarks:

Array.prototype.slice vs spread operator but using params (version: 0)

Compare the new ES6 spread operator with the traditional slice() method

Comparing performance of: Array.prototype.slice vs spread operator

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.slice

spread operator

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):