Benchmark: Array.prototype.slice vs spread operator new

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: 2 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.slice	91279432.0 Ops/sec
spread operator	68460208.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year 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 test case that compares two approaches for creating a copy of an array: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`[ ...array ]`).

**Options compared:**

Two options are being compared:

1. **Traditional `Array.prototype.slice()`**: This method returns a shallow copy of a portion of an array, allowing for modifications to be made to the original array without affecting the copied 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
		- Can be used to create shallow copies of arrays, which can be useful in certain scenarios
	+ Cons:
		- May not work as expected when dealing with objects that contain functions or other complex data structures
		- Can be slower than the spread operator for large datasets
* **New ES6 spread operator (`[ ...array ]`)**:
	+ Pros:
		- Fast and efficient, making it suitable for large datasets
		- Can handle complex data structures without issues
	+ Cons:
		- Not widely supported across older browsers and versions (although it's getting more common)
		- May not be compatible with all JavaScript environments or transpilers

**Library:**

There is no explicit library mentioned in the provided JSON. However, it's worth noting that some implementations of the spread operator might use libraries like `lodash` for its implementation.

**Special JS feature or syntax:**

The spread operator (`[ ...array ]`) is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). It allows for creating new arrays by spreading the elements of an existing array.

**Other alternatives:**

If you're looking for alternative approaches to create array copies, consider using:

* `Array.prototype.concat()` (although it's generally slower than both `slice()` and the spread operator)
* Third-party libraries like `lodash` or `underscore`, which provide additional utility methods for working with arrays

In conclusion, the provided benchmark test case compares two popular approaches for creating array copies in JavaScript: the traditional `Array.prototype.slice()` method and the new ES6 spread operator. The choice of approach depends on your specific use case, performance requirements, and compatibility considerations.

Related benchmarks:

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

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

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

Created: 2 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

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