Benchmark: Array.prototype.slice vs spread operator 222222

Tests:

Array.prototype.slice
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].slice(0);
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 dive into the explanation.

**What is tested?**

MeasureThat.net is testing two approaches for creating a copy of an array in JavaScript: the traditional `Array.prototype.slice()` method and the new ES6 spread operator (`...`).

**Options compared**

The benchmark is comparing the performance of these two methods:

* `Array.prototype.slice()`: This method creates a shallow copy of the original array.
* Spread operator (`...`): This method creates a deep copy of the original array, including all its nested elements.

**Pros and Cons of each approach:**

1. **`Array.prototype.slice()`**:
	* Pros:
		+ Widely supported in older browsers (pre-ES6).
		+ Simple to implement.
	* Cons:
		+ Creates a shallow copy, which may not be suitable for arrays containing nested objects or arrays.
		+ Can be slower than the spread operator for large arrays.
2. **Spread operator (`...`)**:
	* Pros:
		+ Creates a deep copy of the original array, ensuring that all nested elements are also copied.
		+ Generally faster and more efficient than `slice()` for large arrays.
	* Cons:
		+ Requires support for ES6 syntax, which may not be available in older browsers.

**Library usage**

There is no specific library used in this benchmark. The spread operator (`...`) is a built-in JavaScript feature introduced in ES6.

**Special JS features or syntax**

The benchmark uses the ES6 spread operator (`...`), which requires support for ES6 syntax. If you're running this benchmark on an older browser that doesn't support ES6, you may need to transpile or polyfill the code using a library like Babel or a polyfill.

**Other alternatives**

Before adopting the spread operator, it's worth considering other alternatives:

* `Array.prototype.concat()`: Creates a shallow copy of the original array by concatenating it with an empty array. This method is also widely supported but can be slower than the spread operator.
* `Array.prototype.slice().map()`: Creates a new array by applying the `map()` function to each element in the original array. This method is more verbose than using `slice()` or the spread operator, but it ensures that all elements are copied.

In summary, the benchmark is testing the performance of two methods for creating an array copy: `Array.prototype.slice()` and the new ES6 spread operator (`...`). The spread operator offers a deeper copy, which can be beneficial in certain scenarios, but requires support for ES6 syntax.

Related benchmarks:

Array.prototype.slice vs spread operator 222222 (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):