Benchmark: Array from vs Spread es6

Tests:

spead
[...Array(100)].map((_, i) => console.log(i));
from
Array.from({length: 10}).map((_, i) => console.log(i));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spead
from

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 YaBrowser/25.2.0.0 Safari/537.36

Browser/OS: Yandex Browser 25 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spead	4637.0 Ops/sec
from	43617.3 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition JSON**

The benchmark definition is empty, but we can infer that it's comparing two approaches to create an array of numbers: using the spread operator (`...`) with ES6 syntax, and `Array.from()` method.

**Options Compared**

Two options are compared:

1. **Spread Operator (`...`)**: This approach uses the spread operator to create a new array by iterating over a sequence of values (in this case, 100 numbers from 0 to 99). The resulting array is then mapped to print each number.
2. **`Array.from()` Method**: This approach uses the `Array.from()` method to create an array from an iterable source (an object with a `length` property set to 10). The resulting array is then mapped to print each number.

**Pros and Cons of Each Approach**

1. **Spread Operator (`...`)**:
	* Pros: concise, easy to read, works well for small arrays.
	* Cons: may be slower than `Array.from()` for large arrays due to the overhead of creating a new array.
2. **`Array.from()` Method**:
	* Pros: more efficient for large arrays, allows for customizable iterables (e.g., using an object or a generator).
	* Cons: less concise and readable than the spread operator.

**Library and Purpose**

There is no explicit library mentioned in the benchmark definition, but it's likely that `Array.from()` uses the V8 JavaScript engine's built-in implementation. `Array.from()` provides a more efficient way to create an array from an iterable source, making it a good choice when working with large datasets.

**Special JS Feature or Syntax**

There is no special JS feature or syntax mentioned in the benchmark definition. Both approaches use standard JavaScript features: arrays and the spread operator (`...`).

**Other Considerations**

* The benchmark measures the execution time of each approach.
* The test cases are designed to be concise and focused on the specific comparison.

**Alternatives**

Some alternatives for creating an array of numbers might include:

1. `Array.prototype.fill()`: This method can be used to create an array filled with a value (in this case, numbers from 0 to 99).
2. A custom loop: A simple loop can be used to create an array by assigning each number to an element in the array.

Keep in mind that these alternatives might not be as efficient or concise as the spread operator (`...`) or `Array.from()` method used in this benchmark.

Related benchmarks:

Array from vs Spread es6 (version: 0)

Comparing performance of: spead vs from

Created: 2 years ago by: Guest

Jump to the latest result

spead

from

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):