Benchmark: Array.from vs Spread new

Tests:

Array.from
var fooSet = new Set(); for(var i=0;i<100000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Spread
var fooSet = new Set(); for(var i=0;i<100000;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):

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided JSON represents two individual test cases for measuring the performance of JavaScript code on MeasureThat.net. The tests are designed to compare the execution times of two different approaches: `Array.from` and the spread operator (`...`) when adding elements to a `Set` object.

**Options being compared:**

There are two options being compared:

1. **`Array.from(fooSet)`**: This approach creates a new array from the elements of the `fooSet` Set object.
2. **`[...fooSet]`**: This approach uses the spread operator to create a new array from the elements of the `fooSet` Set object.

**Pros and cons:**

**`Array.from(fooSet)`**:

Pros:

* More explicit and readable code
* Allows for more control over the resulting array (e.g., filtering, mapping)

Cons:

* Creates an additional copy of the set's elements, which can be memory-intensive
* May incur overhead due to creating a new array

**`[...fooSet]`**:

Pros:

* More concise and expressive code
* Can take advantage of the optimized spread operator implementation in modern browsers

Cons:

* Less explicit and readable code (some may consider it less maintainable)
* May rely on browser-specific optimizations, which can lead to inconsistencies across different environments

**Library used:**

In both test cases, a `Set` object is used. The `Set` API is a built-in JavaScript library that provides an efficient way to store and manipulate unique values.

**Special JS feature or syntax:**

The tests use the spread operator (`...`) which was introduced in ECMAScript 2015 (ES6). This feature allows for concise array creation by spreading elements of one object into another.

**Benchmark preparation code:**

Both test cases follow a similar structure:

1. Create an empty `Set` object named `fooSet`.
2. Add 100,000 unique values to the set using a `for` loop.
3. Use either `Array.from(fooSet)` or `[...fooSet]` to create a new array from the set's elements.

**Other alternatives:**

For creating arrays from sets in JavaScript, other approaches include:

1. Using the `Array.prototype.reduce()` method:
```javascript
var fooSet = new Set();
for (var i = 0; i < 100000; i++) {
  fooSet.add(i);
}
var other = Array.from(fooSet, x => x); // or [...fooSet]
```
2. Using a `Map` object instead of a `Set`, and then converting it to an array using the spread operator:
```javascript
var fooMap = new Map();
for (var i = 0; i < 100000; i++) {
  fooMap.set(i, true); // or fooMap.add(i)
}
var other = [...fooMap.keys()]; // or [...fooMap.values()]
```
Note that these alternatives may have different performance characteristics and use cases compared to the `Array.from()` and spread operator approaches.

Related benchmarks:

Array.from vs Spread new (version: 0)

Comparing performance of: Array.from vs Spread

Created: 3 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):