Benchmark: Array.prototype.slice vs spread operator [FIXED]

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

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/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	59368832.0 Ops/sec
spread operator	43083576.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two approaches to create a shallow copy of an array: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`[...array]`).

**Options Compared**

There are two options being compared:

1. **Traditional `Array.prototype.slice()`:** This method returns a new, shallow-copied version of the original array.
2. **New ES6 spread operator (`[...array]`):** This method creates a new array by spreading the elements of the original array.

**Pros and Cons**

* **Traditional `Array.prototype.slice()`:**
	+ Pros:
		- Widely supported across different browsers and versions.
		- Simple to implement.
	+ Cons:
		- Can be slower than the spread operator due to the overhead of creating a new object and iterating over the original array.
* **New ES6 spread operator (`[...array]`):**
	+ Pros:
		- More concise and readable.
		- Can be faster than traditional `slice()` since it avoids the overhead of creating a new object and iterating over the original array.
	+ Cons:
		- Not supported in older browsers or versions (e.g., Internet Explorer 11).
		- May have performance issues with very large arrays due to memory allocation.

**Library and Purpose**

There is no external library used in this benchmark. The spread operator is a built-in JavaScript feature introduced in ES6.

**Special JS Feature or Syntax**

The spread operator (`[...array]`) is a new syntax introduced in ES6, which allows you to create a new array by spreading the elements of an existing array. This feature is widely supported across modern browsers and versions.

**Other Alternatives**

If you need to support older browsers or versions, you can use other methods to create a shallow copy of an array, such as:

* `Array.prototype.slice.call()`: This method calls the `slice()` method on an array-like object and returns a new array.
* `Array.prototype.slice.apply()`: This method applies the `slice()` method to an array-like object and returns a new array.

However, these methods may not be as concise or readable as the spread operator.

**Benchmark Preparation Code**

The benchmark preparation code is empty (`"Script Preparation Code": null`, `"Html Preparation Code": null`), which means that no additional setup or configuration is required for this benchmark. The focus is solely on comparing the performance of the two array copying methods.

Related benchmarks:

Array.prototype.slice vs spread operator [FIXED] (version: 0)

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

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

Created: one year 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

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