Benchmark: Benchmark spread vs forof

Tests:

spead
let array_1 = []; const array_2 = ['a', 'b', 'c'] array_1 = [...array_2]
forof
const array_1 = []; const array_2 = ['a', 'b', 'c'] for (const element of array_2) { array_1.push(element); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spead
forof

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark JSON and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition is not explicitly provided in the JSON, but based on the test cases, it appears to be a comparison between two methods of spreading an array in JavaScript:

1. **`...array_2`**: This is the spread operator (also known as the rest spread operator), which creates a new array by copying all elements from `array_2`.
2. **`for...of` loop with `push()`**: This method iterates over `array_2` using a `for...of` loop and pushes each element onto a new array (`array_1`).

**Test Cases**

There are two test cases:

1. **`spread`**:
```javascript
let array_1 = [];
const array_2 = ['a', 'b', 'c'];
array_1 = [...array_2];
```
This code creates an empty array `array_1`, then uses the spread operator to create a new array by copying all elements from `array_2`.

2. **`forof`**:
```javascript
const array_1 = [];
const array_2 = ['a', 'b', 'c'];
for (const element of array_2) {
  array_1.push(element);
}
```
This code creates an empty array `array_1`, then uses a `for...of` loop to iterate over `array_2` and pushes each element onto `array_1`.

**Options Compared**

The two options being compared are:

1. **Spread Operator (`...`)**: Creates a new array by copying all elements from the original array.
2. **`for...of` loop with `push()`**: Iterates over the original array using a loop and pushes each element onto a new array.

**Pros and Cons**

**Spread Operator:**

Pros:

* Concise and expressive syntax
* Creates a new array, which can be beneficial for performance-critical code

Cons:

* May incur additional overhead due to array creation
* Not suitable for large arrays or memory-constrained environments

**`for...of` loop with `push()`**:**

Pros:

* Flexible and control-oriented approach
* Suitable for large arrays or memory-constrained environments

Cons:

* Verbose syntax can be less readable
* May incur additional overhead due to the loop itself

**Other Considerations**

* The spread operator is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). Its performance has improved significantly since then.
* The `for...of` loop with `push()` is a more traditional approach and may be better suited for older browsers or environments that don't support the spread operator.

**Library Usage**

There are no libraries used in this benchmark.

**Special JS Features/Syntax**

The only special feature used here is the spread operator (`...`). It's not uncommon to see this syntax used in modern JavaScript code, especially when working with arrays and objects.

**Alternatives**

If you're interested in exploring alternative approaches for spreading an array, some other options include:

* Using `Array.prototype.slice()` or `Array.prototype.splice()`: These methods can be used to create a new array by copying elements from the original array.
* Using a library like Lodash's `_spread` function: This function provides a more concise way to spread arrays and objects.

Keep in mind that these alternatives may have different performance characteristics and syntax, so it's essential to choose the best approach for your specific use case.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser/OS: Chrome 108 on Windows

View result in a separate tab

Test name	Executions per second
spead	56038420.0 Ops/sec
forof	31230996.0 Ops/sec

Related benchmarks:

Benchmark spread vs forof (version: 0)

Comparing performance of: spead vs forof

Created: one year ago by: Guest

Jump to the latest result

spead

forof

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):