Benchmark: Set->Array.from vs iterative pushing

Tests:

Array.from
var fooSet = new Set(); for(var i=0;i<1000;i++) { fooSet.add(i); } var other = Array.from(fooSet);
Push
var fooSet = new Set(); var fooArr = []; for(var i=0;i<1000;i++) { fooSet.add(i); fooArr.push(i); } var other = fooArr;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.from
Push

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/136.0.0.0 Safari/537.36 Edg/136.0.0.0

Browser/OS: Chrome 136 on Windows

View result in a separate tab

Test name	Executions per second
Array.from	74610.5 Ops/sec
Push	63247.7 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 benchmark and explain what's being tested.

**Benchmark Overview**

The test measures the performance of two approaches to convert a `Set` object to an array: using `Array.from()` and iterative pushing of elements into an array.

**Options Compared**

There are two options being compared:

1. **Using `Array.from()`**: This approach converts the `Set` object directly to an array using the `Array.from()` method.
2. **Iterative Pushing**: This approach creates an empty array, pushes each element from the `Set` object into it, and then returns the resulting array.

**Pros and Cons**

1. **Using `Array.from()`**:
	* Pros: concise and efficient, as it leverages a native JavaScript method.
	* Cons: may incur additional overhead due to the method call and potential browser optimizations (e.g., caching).
2. **Iterative Pushing**:
	* Pros: potentially more control over the conversion process and avoids any indirect calls or method invocations.
	* Cons: can be less efficient, as it involves a separate array creation and element pushing operation.

**Library and Purpose**

In this benchmark, `Array.from()` is a built-in JavaScript method that converts an iterable (e.g., `Set`, arrays) to an array. Its purpose is to provide a concise and efficient way to perform such conversions.

**Special JS Feature/Syntax**

None mentioned in the provided code or benchmark definition.

**Other Considerations**

When considering these approaches, keep in mind:

* Modern JavaScript engines often optimize built-in methods like `Array.from()` for performance.
* The benchmark results may be influenced by factors like browser version, hardware, and system configuration.
* This test focuses on conversion from a `Set` object to an array; other scenarios might yield different results.

**Alternatives**

Other alternatives for converting a `Set` object to an array include:

1. Using the spread operator (`...`): `var arr = [...fooSet];`
2. Creating an empty array and using `forEach()` or a loop: `var fooArr = []; fooArr.forEach(function(i) { fooArr.push(i); });`
3. Using other libraries or polyfills, like Lodash's `fromJS()`: `"const _ = require('lodash'); var fooArr = _.fromJS(fooSet);"`

Keep in mind that the performance differences between these approaches might be negligible for small to medium-sized datasets.

Related benchmarks:

Set->Array.from vs iterative pushing (version: 0)

Comparing performance of: Array.from vs Push

Created: 2 years ago by: Guest

Jump to the latest result

Array.from

Push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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