Benchmark: Array.prototype.slice vs spread operator vs Object.values

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice();
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params ]
Object.values
var params = [ "hello", true, 7 ] var other = Object.values(params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.slice
spread operator
Object.values

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The provided JSON represents a benchmark that compares three methods for creating a shallow copy of an array:

1. `Array.prototype.slice()`
2. The ES6 spread operator (`[ ...params ]`)
3. `Object.values()` (in this case, used to extract the values from an object-like array)

**Options being compared**

The benchmark is comparing the performance of these three methods on a sample input:

`var params = [ "hello", true, 7 ];`

Each method will be executed multiple times, and the execution time will be measured.

**Pros and Cons of each approach:**

1. `Array.prototype.slice()`
	* Pros:
		+ Widely supported and well-known
		+ Can handle arrays of any size
	* Cons:
		+ Creates a new array with a separate memory allocation, which can lead to increased memory usage
		+ May be slower for very large arrays due to the overhead of creating a new array
2. ES6 spread operator (`[ ...params ]`)
	* Pros:
		+ Creates a shallow copy without creating a new array or object
		+ Can handle arrays of any size without increasing memory usage
	* Cons:
		+ Only supported in modern browsers and Node.js (ECMAScript 2018 and later)
		+ May be slower due to the overhead of creating an iterator or generator function
3. `Object.values()`
	* Pros:
		+ Creates a shallow copy without creating a new array or object
		+ Can handle arrays of any size without increasing memory usage
	* Cons:
		+ Only works on objects that have a `values()` method, which may not be the case for all types of arrays (e.g., `String`, `Number` arrays)
		+ May be slower due to the overhead of calling a method and iterating over the values

**Library usage**

In this benchmark, none of the libraries are explicitly mentioned. However, it's worth noting that `Object.values()` is part of the ECMAScript standard, which means it's available in most modern browsers and Node.js versions.

**Special JavaScript features or syntax**

None of the benchmark test cases use any special JavaScript features or syntax beyond what's shown in the `Benchmark Definition` JSON. However, it's worth noting that some browsers may have specific implementations or optimizations for certain features, which could affect benchmark results.

**Other alternatives**

If you were to implement a similar benchmark, you might consider adding additional methods for creating shallow copies of arrays, such as:

* `Array.from()` (ECMAScript 2015)
* `slice()` with an optional `start` and `end` index
* A custom implementation using `reduce()` or other array methods

Keep in mind that the choice of method will depend on your specific use case and requirements.

I hope this explanation helps! Let me know if you have any further questions.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.60 Safari/537.36

Browser/OS: Chrome 100 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	187192800.0 Ops/sec
spread operator	91819552.0 Ops/sec
Object.values	5422750.0 Ops/sec

Related benchmarks:

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

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

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.slice

spread operator

Object.values

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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