Benchmark: Push element using Array.prototype.slice vs spread operator

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; params.push('hi'); var other = params.slice();
spread operator
var params = [ "hello", true, 7 ]; var other = [ ...params, 'hi' ];

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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 llama3.1:latest, generated one year ago):

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Let's dive into the details of this benchmark.

**What is being tested?**

The benchmark compares two ways to push an element onto the end of an array in JavaScript:

1. Using `Array.prototype.slice()`
2. Using the spread operator (`[...array, element]`)

**What are the options compared?**

In this case, there are only two options being compared:

1. **`Array.prototype.slice()`**: This method creates a shallow copy of an array, including all its elements. When used to push an element onto the end of the original array, it involves creating a new array with the copied elements and then adding the new element at the end.
2. **Spread operator (`[...array, element]`)**: This is a newer syntax (introduced in ES6) that creates a shallow copy of the original array and adds the new element at the end.

**Pros and cons of each approach**

1. **`Array.prototype.slice()`**:
	* Pros: Widely supported across older browsers and environments.
	* Cons: Creates an unnecessary intermediate array, which can lead to performance issues when working with large arrays.
2. **Spread operator (`[...array, element]`)**:
	* Pros: More concise and expressive syntax, making it easier to read and maintain code.
	* Cons: Not supported in older browsers or environments (although most modern browsers support it).

**Other considerations**

When choosing between these two approaches, consider the following:

1. **Performance**: For large arrays, using `Array.prototype.slice()` can lead to performance issues due to the creation of intermediate arrays. In this benchmark, the spread operator seems to be performing slightly better.
2. **Support and compatibility**: If you need to support older browsers or environments, `Array.prototype.slice()` is a safer choice.

**Library used**

None in this specific benchmark.

**Special JavaScript features or syntax used**

* Spread operator (`[...array, element]`): Introduced in ES6 as a concise way to create shallow copies of arrays and objects.
* `Array.prototype.slice()`: A built-in array method available in most modern browsers and environments.

**Other alternatives**

If you're looking for alternative ways to push an element onto the end of an array, consider:

1. **Using `push()`**: This is the most straightforward way to add an element to the end of an array.
2. **Using `concat()`**: This method creates a new array by concatenating two or more arrays (including the original array). While not as efficient as using `push()`, it can be useful in certain scenarios.

Keep in mind that these alternatives might not be directly compared to the spread operator and `Array.prototype.slice()` in this benchmark, so performance differences may vary.

Related benchmarks:

Push element using Array.prototype.slice vs spread operator (version: 0)

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

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

Created: 3 years ago by: Registered User

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 llama3.1:latest, generated one year ago):