Benchmark: Array.from vs Spread 10k

Tests:

Array.from
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<10000;i++) { fooSet.add(i); } 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

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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

**Benchmark Definition**

The `Array.from vs Spread 10k` benchmark measures the performance difference between two approaches: using `Array.from()` and using the spread operator (`...`) to convert a `Set` object to an array.

**Options Compared**

Two options are compared:

1. **`Array.from()`**: This method creates a new array from an iterable or an array-like object.
2. **Spread Operator (`...`)**: This operator is used to expand an iterable into individual elements, which can then be used in an expression.

**Pros and Cons of Each Approach**

* **`Array.from()`**:
	+ Pros: More explicit and readable way to create arrays from iterables or array-like objects.
	+ Cons: May incur additional overhead due to the creation of a new array object.
* **Spread Operator (`...`)**:
	+ Pros: Concise and expressive syntax, eliminates the need for an intermediate array creation step.
	+ Cons: May be less readable for developers who are not familiar with this syntax.

**Library Used**

In both benchmark cases, the `Set` library is used. A `Set` object in JavaScript is a collection of unique values, which is essentially an unordered collection of elements that can't be repeated. The `Set` class provides methods to add, remove, and check for membership in the set.

**Special JS Feature/ Syntax**

The benchmark uses the spread operator (`...`) syntax, which is a relatively new feature introduced in ECMAScript 2015 (ES6). This syntax allows for concise creation of arrays or objects from iterables. It's also used to create new objects by copying properties from an existing object.

**Other Alternatives**

If you want to implement this benchmark yourself, here are some alternatives:

* Use `Array.prototype.push()` and `Array.prototype.length` to push elements into an array and then use `Array.slice()` or `Array.subarray()` to extract the desired subset.
* Use a library like Lodash (specifically, `_.clone()` or `_.map()`) to create arrays from sets.

Keep in mind that these alternatives might not provide the exact same performance characteristics as the original benchmarked code.

To implement this benchmark yourself, you can use a tool like Node.js and the `Benchmark` module. Here's some example JavaScript code to get you started:
```javascript
const Benchmark = require('benchmark');

// Create a set with 10k elements
const set = new Set();
for (let i = 0; i < 10000; i++) {
  set.add(i);
}

// Define the benchmark cases
function arrayFrom() {
  return Array.from(set);
}

function spread() {
  return [...set];
}

// Run the benchmarks
Benchmark.Suite()
  .add('Array.from()', function () { return arrayFrom(); })
  .add('Spread', function () { return spread(); })
  .on('complete', function () {
    console.log(this.filter('fastest').map('name'));
  })
  .run();
```

Related benchmarks:

Array.from vs Spread 10k (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>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):