Benchmark: Slice vs Spread Operator Test

Tests:

Array.prototype.slice
var params = [ "hello", true, 7, "hello", true, 7, 595, 3189665, 5184815, 1216945, 33323256 ]; var other = params.slice();
spread operator
var params = [ "hello", true, 7, "hello", true, 7, 595, 3189665, 5184815, 1216945, 33323256 ] 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):

LLMs can make mistakes. Check important info.

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

**Benchmark Description:**

The test compares the performance of two approaches to create a shallow copy of an array:

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

**Options Compared:**

* `Array.prototype.slice()`: A traditional method for creating a shallow copy of an array.
* Spread operator (`[ ...params ]`): A newer approach that uses the spread operator to create a new array with elements from the original array.

**Pros and Cons of Each Approach:**

* `Array.prototype.slice()`:
	+ Pros: Widely supported, well-established method, easy to read and understand.
	+ Cons: May be slower than the spread operator due to the overhead of calling a function and handling edge cases.
* Spread operator (`[ ...params ]`):
	+ Pros: Faster than `Array.prototype.slice()`, more concise, and easier to write.
	+ Cons: Less widely supported (requires modern JavaScript engines), may not work as expected in certain situations.

**Library Used:**

None explicitly mentioned. However, the spread operator is a built-in JavaScript feature that does not require any external library.

**Special JS Feature/Syntax:**

The test uses the ES6 spread operator (`[ ...params ]`), which is a newer syntax introduced with ECMAScript 2015 (ES6).

**Benchmark Preparation Code:**

The provided script preparation code for each test case is identical:

```javascript
var params = [ "hello", true, 7, "hello", true, 7, 595, 3189665, 5184815, 1216945, 33323256 ];

var other = params.slice();
```

This creates an array `params` with a large number of elements and then uses the `Array.prototype.slice()` method to create a shallow copy of it. The second test case is similar, but uses the spread operator instead.

**Other Alternatives:**

If you want to compare the performance of other methods for creating a shallow copy of an array, you could also consider:

* Using a library like Lodash's `cloneDeep()` function.
* Implementing your own custom clone function using recursion or iteration.
* Comparing the performance of different types of copies (e.g., shallow vs. deep copy).

For this particular benchmark, it seems that the spread operator is currently faster than `Array.prototype.slice()`. However, the performance results may vary depending on the specific JavaScript engine and version being used.

It's worth noting that MeasureThat.net provides a convenient way to compare the performance of different code snippets, making it easy to identify which approach is fastest in different scenarios.

Related benchmarks:

Slice vs Spread Operator Test (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: 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):