Benchmark: Array.from vs Spread123

Tests:

Array.from
var fooSet = []; for(var i=0;i<10000;i++) { fooSet.push(i); } var other = Array.from(fooSet);
Spread
var fooSet = []; for(var i=0;i<10000;i++) { fooSet.push(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:

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/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
Array.from	38380.7 Ops/sec
Spread	38894.5 Ops/sec

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's being tested.

**Benchmark Definition**

The benchmark is defined by two test cases: `Array.from` and `Spread`. The purpose of this benchmark is to compare the performance of two ways to create an array from another iterable (in this case, a set).

**Options Compared**

Two options are compared:

1. **`Array.from()`**: This method creates a new array instance by copying elements from another iterable (such as an array or a set) and returns it.
2. **Spread Operator (`...`)**: This operator creates a new array instance by spreading the elements of another iterable (such as an array or a set).

**Pros and Cons**

* **`Array.from()`**:
	+ Pros: It's a more explicit and type-safe way to create an array from another iterable. It also allows for specifying an initial length for the resulting array.
	+ Cons: It can be slower than the spread operator, especially when dealing with large datasets.
* **Spread Operator (`...`)**:
	+ Pros: It's faster and more concise than `Array.from()`. It's also widely used in modern JavaScript codebases.
	+ Cons: It can lead to less explicit and less type-safe code, which might be problematic for some developers.

**Library Usage**

Neither of the options uses a library. However, it's worth noting that both methods are part of the ECMAScript standard and are supported by most JavaScript engines out-of-the-box.

**Special JS Feature or Syntax**

The benchmark doesn't use any special JavaScript features or syntax. It's written in plain vanilla JavaScript and should be easily recognizable to developers familiar with the language.

**Other Alternatives**

Other ways to create an array from another iterable include:

* `Array.prototype.slice()` or `Array.prototype.splice()`: These methods can be used to extract a subset of elements from another array, but they're not as efficient as `Array.from()` and the spread operator for creating an entirely new array.
* `Array.prototype.map()` or `Array.prototype.forEach()`: These methods can be used to transform or iterate over another iterable, but they're not designed specifically for creating arrays.

It's worth noting that in modern JavaScript, you'd typically use `Array.from()` instead of the spread operator when working with iterables. The spread operator is more commonly used when working directly with arrays or other array-like objects.

Related benchmarks:

Array.from vs Spread123 (version: 0)

Comparing performance of: Array.from vs Spread

Created: one year ago by: Guest

Jump to the latest result

Array.from

Spread

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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