Benchmark: Array.prototype.slice vs spread operator 73

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/125.0.0.0 Safari/537.36

Browser/OS: Chrome 125 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	89184912.0 Ops/sec
spread operator	66215184.0 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 benchmark and its options.

**Benchmark Purpose**
The benchmark compares the performance of two approaches for creating a shallow copy of an array: the `Array.prototype.slice()` method and the new ES6 spread operator (`[ ...params ]`).

**Options Compared**

1. **Array.prototype.slice()**: This method creates a new array by extracting a range of elements from another array.
2. **Spread Operator (`[ ...params ]`)**: This operator creates a new array by taking all elements from the `params` array.

**Pros and Cons of Each Approach**

* **Array.prototype.slice()**:
	+ Pros:
		- Widely supported and well-known method.
		- Generally faster due to its native implementation.
	+ Cons:
		- Requires an extra function call (`.slice()`).
		- May have performance overhead depending on the browser.
* **Spread Operator (`[ ...params ]`)**:
	+ Pros:
		- Newer and more modern approach, which might be more efficient in some cases.
		- Simplifies code and reduces clutter by eliminating the need for a separate function call.
	+ Cons:
		- Less widely supported (only introduced in ES6).
		- Might have performance overhead depending on the browser.

**Library/Function Used**
None, as this benchmark only compares two native JavaScript methods.

**Special JS Feature/Syntax**
The spread operator (`[ ...params ]`) is a new feature introduced in ECMAScript 2015 (ES6). It's designed to simplify array creation and copying by allowing you to take elements from an existing array using the `...` syntax.

**Other Alternatives**

In addition to these two methods, there are other ways to create a shallow copy of an array, such as:

* Using the `Array.prototype.slice()` method with no arguments (which creates an empty array).
* Using a library like Lodash (`_.cloneDeep()`) or a dedicated array cloning function.

However, for simple cases where you only need to create a shallow copy of an array, the spread operator and `Array.prototype.slice()` methods are likely sufficient.

Related benchmarks:

Array.prototype.slice vs spread operator 73 (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):