Benchmark: Set iteration-fixed

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var x = new Set();
for (var i = 0; i < 100000; i++) {
  x.add(i);
}

Tests:

for of
let sum = 0; for (const item of x) { sum += item; }
forEach
let sum = 0; x.forEach(item => sum += item);
array iterate
let sum = 0; var arr = Array.from(x); for (let i = 0; i < arr.length; i++) { sum += arr[i]; };
_.each
let sum = 0; _.each(Array.from(x), val => sum += val);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for of
forEach
array iterate
_.each

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

I'll explain the benchmark and provide an overview of the options compared.

**Benchmark Overview**

The provided benchmark measures the performance of three different approaches for iterating over a Set object in JavaScript: `for...of`, `forEach`, and converting the Set to an array using `Array.from()` followed by a traditional `for` loop. The benchmark also uses Lodash's `_.each` function as a fourth option.

**Options Compared**

1. **`for...of`**: This approach iterates over the elements of the Set object using the `for...of` statement, which is a modern iteration method introduced in ECMAScript 2015.
2. **`forEach`**: This approach uses the `forEach` method provided by the Set object to iterate over its elements.
3. **`Array.from()` + Traditional `for` Loop**: This approach converts the Set object to an array using `Array.from()`, which returns a new array containing all elements of the original Set, and then iterates over the array using a traditional `for` loop.
4. **Lodash's `_`.each`**: This approach uses Lodash's `_.each` function to iterate over the elements of the Set object.

**Pros and Cons**

*   **`for...of`**: This approach is modern, concise, and easy to read. However, it may not be supported in older browsers or versions of JavaScript.
*   **`forEach`**: This approach is also concise and easy to use, but it may have performance implications compared to the traditional `for` loop approach.
*   **`Array.from()` + Traditional `for` Loop**: This approach can provide good performance and is widely supported across browsers and versions of JavaScript. However, it requires creating an array, which can be memory-intensive for large datasets.
*   **Lodash's `_`.each`**: This approach provides a convenient and concise way to iterate over the elements of the Set object. However, it relies on Lodash being included in the project, which may add unnecessary dependencies.

**Library Usage**

The benchmark uses Lodash version 4.17.5, which includes the `_.each` function. Lodash is a popular utility library for JavaScript that provides a collection of functions for tasks such as array manipulation, object iteration, and more.

**Special JS Features or Syntax**

The benchmark does not use any special JavaScript features or syntax beyond what is required to demonstrate each option. The only feature used is the modern `for...of` statement, which was introduced in ECMAScript 2015.

I hope this explanation helps you understand the benchmark and its options! Let me know if you have further questions.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36

Browser/OS: Chrome 73 on Windows

View result in a separate tab

Test name	Executions per second
for of	6479.6 Ops/sec
forEach	907.8 Ops/sec
array iterate	1474.3 Ops/sec
_.each	661.7 Ops/sec

Related benchmarks:

Set iteration-fixed (version: 2)

Comparing performance of: for of vs forEach vs array iterate vs _.each

Created: 5 years ago by: Registered User

Jump to the latest result

for of

forEach

array iterate

_.each

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):