Benchmark: Array.prototype.slice vs spread operator 12

Tests:

Array.prototype.slice
let params = [ "hello", true, 7 ]; let result = params.slice(1);
spread operator
let params = [ "hello", true, 7 ]; let [ first, ...result ] = 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

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested, compared, and their pros/cons.

**What is being tested?**

The benchmark compares two approaches to slice an array in JavaScript:

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

The benchmark aims to measure which approach is faster, specifically for a given test case where the input array has 3 elements: `"hello"`, `true`, and `7`.

**Options compared**

The two options being compared are:

1. **`Array.prototype.slice()`**: A traditional method for creating a shallow copy of an array, starting from the specified index.
2. **ES6 spread operator (`...`)**: A new syntax introduced in ECMAScript 2015 (ES6), allowing for more concise and expressive array manipulation.

**Pros and Cons**

**`Array.prototype.slice()`**:

Pros:

* Widely supported and implemented by most browsers
* Simple and straightforward to use

Cons:

* Can be slower than the spread operator, especially for large arrays
* Does not support sparse arrays or arrays with holes

**ES6 spread operator (`...`)**

Pros:

* Faster than `Array.prototype.slice()` for large arrays
* Supports sparse arrays and arrays with holes
* More concise and expressive syntax

Cons:

* Requires ECMAScript 2015 (ES6) support, which may not be available in older browsers or environments
* Can be less readable to those unfamiliar with the syntax

**Library usage**

None of the provided benchmark definitions include any libraries. However, it's worth noting that some JavaScript implementations, such as V8 and SpiderMonkey, have optimized their array slice implementation using SIMD instructions, which can further improve performance.

**Special JS feature or syntax**

The spread operator (`...`) is a new syntax introduced in ECMAScript 2015 (ES6). It allows for more concise and expressive array manipulation, but may not be supported by older browsers or environments.

**Other alternatives**

For smaller arrays, the difference between `Array.prototype.slice()` and the spread operator might be negligible. However, for larger arrays or performance-critical applications, the spread operator is likely to be faster.

If you need to support older browsers or environments that don't implement the spread operator, you may want to use a polyfill or fall back to `Array.prototype.slice()`.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

Browser/OS: Chrome 72 on Windows 7

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	24647682.0 Ops/sec
spread operator	26557626.0 Ops/sec

Related benchmarks:

Array.prototype.slice vs spread operator 12 (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.slice

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):