Benchmark: Array.prototype.slice vs spread operator with same data

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

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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 Overview**

The benchmark compares the performance of two ways to create a copy of an array: using the `Array.prototype.slice()` method and the new ES6 spread operator (`[ ...params ]`).

**Options Compared**

Two options are compared:

1. **`Array.prototype.slice()`**: This is a traditional method for creating a shallow copy of an array.
2. **Spread Operator (`[ ...params ]`)**: This is a newer, more concise way to create a copy of an array using the spread operator.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **`Array.prototype.slice()`**:
	+ Pros:
		- Widely supported and well-established
		- Easy to read and understand for developers familiar with the method
	+ Cons:
		- May be slower than the spread operator due to overhead from creating a new array
		- Requires explicit type declaration when using modern JavaScript versions (e.g., `let other = params.slice();`)
* **Spread Operator (`[ ...params ]`)**:
	+ Pros:
		- More concise and expressive code
		- Often faster than the slice method due to reduced overhead from creating a new array
		- No explicit type declaration required in modern JavaScript versions
	+ Cons:
		- May be less familiar or harder to read for developers without experience with the spread operator

**Library Usage**

There is no specific library mentioned in the benchmark definition, as both methods are built-in to the JavaScript language.

**Special JS Features/Syntax**

The benchmark uses a special syntax feature: the spread operator (`[ ...params ]`). This was introduced in ECMAScript 2015 (ES6) and allows for creating new arrays by spreading elements from an existing array or other iterable. The use of this syntax suggests that the benchmark is targeting modern JavaScript environments.

**Other Alternatives**

If you wanted to compare these methods, here are some alternative approaches:

* **`Array.prototype.concat()`**: This method combines two arrays into a single array and returns it. While not as efficient as the spread operator or slice, it can still be used in certain scenarios.
* **Manual Array Copying**: You could write custom code to manually copy an array using loops, but this would likely be slower and less concise than using either the slice method or the spread operator.

Keep in mind that these alternative approaches might not provide the same level of performance as the benchmark's focus on `Array.prototype.slice()` and the spread operator.

Related benchmarks:

Array.prototype.slice vs spread operator with same data (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):