Benchmark: array.from vs spread big data

Tests:

array.from
var fooSet = new Set(); for(var i=0;i<1000;i++) { fooSet.add(i^2); } var other = Array.from(fooSet);
spread
var fooSet = new Set(); for(var i=0;i<1000;i++) { fooSet.add(i^2); } var other = [...fooSet];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array.from
spread

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark measures the performance difference between two approaches: using `Array.from()` and using the spread operator (`...`) to convert a Set object to an array.

**Tested Options**

There are only two options being compared:

1. **`Array.from()`**: This method creates a new, shallow-copied Array instance from an iterable or an array-like object.
2. **Spread Operator (`...`)**: This operator is used to create a new array by spreading the elements of an array or an iterable.

**Pros and Cons**

* **`Array.from()`**:
	+ Pros: Generally considered more efficient, as it creates a new array without modifying the original set.
	+ Cons: May require additional memory allocation, depending on the size of the set.
* **Spread Operator (`...`)**:
	+ Pros: Can be faster for small to medium-sized sets, as it uses a more lightweight approach that doesn't create a new array.
	+ Cons: Creates a new array and can lead to unexpected behavior if not used carefully.

**Library and Special JS Features**

In this benchmark, the following libraries are not explicitly mentioned:

* No external libraries are required for this benchmark.
* There is no special JavaScript feature or syntax being tested.

**Benchmark Preparation Code**

The script preparation code for each test case is:
```javascript
var fooSet = new Set();
for (var i = 0; i < 1000; i++) {
    fooSet.add(i ^ 2);
}
```
This code creates a new Set object `fooSet` and adds the result of the expression `i ^ 2` to it, using a loop that runs 1000 times.

**Individual Test Cases**

There are two test cases:

1. **`array.from`**: This test case uses the `Array.from()` method to convert the `fooSet` object to an array.
```javascript
var other = Array.from(fooSet);
```
2. **`spread`**: This test case uses the spread operator (`...`) to convert the `fooSet` object to an array.
```javascript
var other = [...fooSet];
```
**Latest Benchmark Result**

The latest benchmark result shows that the spread operator (`...`) outperforms `Array.from()` on this specific test case, with approximately 12.5% fewer executions per second.

Here is a summary of the results:

| Test Name | Executions Per Second |
| --- | --- |
| Spread | 18715.61328125 |
| Array.from | 18407.51171875 |

**Other Alternatives**

If you want to explore other approaches, here are some alternatives:

* **`Set.prototype.values()`**: This method returns an iterator over the values of a Set object.
* **`Array.prototype.slice()`**: This method creates a shallow copy of a portion of an array.
* **`Array.prototype.concat()`**: This method concatenates one or more arrays.

Keep in mind that each approach has its own trade-offs and may be more suitable for specific use cases.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser/OS: Chrome 73 on Linux

View result in a separate tab

Test name	Executions per second
array.from	18407.5 Ops/sec
spread	18715.6 Ops/sec

Related benchmarks:

array.from vs spread big data (version: 0)

Comparing performance of: array.from vs spread

Created: 5 years ago by: Guest

Jump to the latest result

array.from

spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):