Benchmark: Array.prototype.slice vs spread operator 56

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>

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Test case name	Result
Array.prototype.slice
spread operator

Fastest: N/A

Slowest: N/A

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

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Let's break down the benchmark and explain what's being tested.

**Benchmark Purpose:**
The test compares two approaches for creating a copy of an array in JavaScript:

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

**Options Compared:**

* **Traditional approach:** Using `Array.prototype.slice()` to create a shallow copy of the original array.
	+ Pros:
		- Widely supported and well-documented.
		- Can be used with arrays of any type, not just primitive values.
	+ Cons:
		- Creates a new object reference, which can lead to unnecessary memory allocation and garbage collection.
		- May not be suitable for large datasets due to performance concerns.
* **New ES6 spread operator:** Using the `...` syntax to create a shallow copy of the original array.
	+ Pros:
		- More concise and expressive than traditional slice() method.
		- Creates a new array object, which can help avoid memory issues when dealing with large datasets.

**Library Used:**
None explicitly mentioned in this benchmark. However, `Array.prototype.slice()` is a built-in JavaScript method, while the spread operator (`...`) is also part of the ECMAScript standard.

**Special JS Feature/Syntax:**
The test uses the new ES6 spread operator (`...`). This syntax allows for creating a shallow copy of an array by spreading its elements into a new array. It's a concise way to achieve this, but it may not be immediately familiar to all developers.

**Considerations:**

* When working with large datasets, using the spread operator might provide better performance due to reduced memory allocation and garbage collection.
* In cases where array manipulation is complex or requires modifying individual elements, the traditional `slice()` method might be a better choice.
* Code readability and maintainability are also important factors. The new spread operator syntax can make code more concise and expressive, but it may require additional context for developers who are not familiar with this feature.

**Alternatives:**
Other approaches to create an array copy in JavaScript include:

* Using `Array.prototype.concat()`: This method creates a new array by concatenating the original array with other arrays or values. While it's still a form of shallow copying, it can be slower and less memory-efficient than using the spread operator.
* Using a library like Lodash: Some libraries provide additional utility functions for working with arrays, including methods for creating copies (e.g., `_.clone()`, `_.copy()`).
* Manual looping: You could write a simple loop to iterate over the original array and create a new array by pushing each element onto a new array. This approach can be slower and more verbose than using `slice()` or the spread operator.

Overall, this benchmark provides a useful comparison between two commonly used approaches for creating an array copy in JavaScript, highlighting both pros and cons of each method.

Related benchmarks:

Array.prototype.slice vs spread operator 56 (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>

Fastest: N/A

Slowest: N/A

No previous run results

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