Benchmark: Array.prototype.slice vs spread operator - fixed 2

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 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 Firefox/107.0

Browser/OS: Firefox 107 on Windows

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Test name	Executions per second
Array.prototype.slice	32534766.0 Ops/sec
spread operator	23402826.0 Ops/sec

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 on MeasureThat.net.

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

**Options being compared:**

1. **Array.prototype.slice()**: This is the traditional way to create a shallow copy of an array in JavaScript. It takes a subset of elements from the original array and returns a new array object.
2. **Spread operator ([ ...params ])**: Introduced in ES6, this syntax creates a new array by spreading the elements of the original array into a new array.

**Pros and Cons:**

* **Array.prototype.slice()**:
	+ Pros:
		- Wide browser support (since 1998)
		- Well-documented and widely used
	+ Cons:
		- Can be slower than the spread operator for large arrays due to the overhead of creating a new array object
		- May not work as expected with certain types of data structures (e.g., objects with functions as values)
* **Spread operator ([ ...params ])**:
	+ Pros:
		- Faster execution time compared to `slice()` for large arrays
		- More concise and expressive syntax
	+ Cons:
		- Requires ES6 support, which may not be available in older browsers or environments

In terms of performance, the spread operator has a slight edge over the traditional `slice()` method. However, this difference becomes more pronounced with larger input sizes.

**Library/External dependencies:**

None explicitly mentioned in the benchmark definition or test cases.

**Special JavaScript features/syntax:**

The benchmark uses the ES6 spread operator (`[ ...params ]`) introduced in 2015. This feature is widely supported across modern browsers, but may not work in older environments without polyfills.

**Other alternatives:**

1. **Array.from()**: Introduced in ES6, this method creates a new array from an iterable (e.g., an array or string) and can be used as an alternative to the spread operator.
2. **Object.assign()**: This method copies elements from one or more source objects to a destination object.

While not directly related to creating arrays, these alternatives demonstrate the versatility of JavaScript's built-in methods for working with data structures.

In summary, the MeasureThat.net benchmark provides a straightforward comparison between two approaches for creating shallow copies of arrays in JavaScript: the traditional `Array.prototype.slice()` method and the new ES6 spread operator. By analyzing the results, developers can gain insights into the performance characteristics of these alternatives and make informed decisions about which approach to use in their own codebase.

Related benchmarks:

Array.prototype.slice vs spread operator - fixed 2 (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>

Experimental features:

Fastest: N/A

Slowest: N/A

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