Benchmark: ForOf+Push vs Map

Script Preparation code:

var objs = Array.from(new Array(1000000)).map(() => ({ prop: 'hi'}))
var result = []

Tests:

For of + Push
for (let x of objs) { result.push(x.prop) }
Map
result = objs.map(x => x.prop)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For of + Push
Map

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark compares the performance of two approaches to iterate over an array of objects and push their properties into another result array:

1. Using a traditional `for` loop with a `forEach`-style iteration (`ForOf + Push`)
2. Using the `Array.prototype.map()` method

**Options Compared**

These are the two options being compared, each with its pros and cons:

### ForOf + Push

Pros:

* Easy to understand and implement
* No need for external libraries or dependencies
* Can be used in older browsers that don't support modern array methods

Cons:

* Can lead to slower performance due to repeated function calls and array indexing
* May not scale well with large arrays

### Map

Pros:

* Native support on modern browsers, providing better performance and security features
* Can handle complex transformations of data without requiring explicit loops
* Often more concise and readable than traditional `for` loops

Cons:

* May require additional setup or dependencies for older browsers
* Can lead to slower performance if not optimized properly

**Library Used**

In this benchmark, the `Array.prototype.map()` method is used. This method applies a specified function to each element of an array and returns a new array with the results. It's a powerful tool in JavaScript that can simplify many iteration tasks.

**JavaScript Features/Syntax Used**

The benchmark uses modern JavaScript features like:

* **Arrow functions**: Simplified syntax for defining small, single-expression functions (e.g., `x => x.prop`).
* **Template literals**: Used to create string literals with interpolated values (`var result = []`).

**Other Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* Using a traditional `for` loop with array indexing: `for (let i = 0; i < objs.length; i++) { result.push(objs[i].prop) }`
* Utilizing other array methods like `Array.prototype.forEach()` or `Array.prototype.reduce()`
* Leveraging modern JavaScript features like `Promise.all()` for parallel processing

Keep in mind that the performance differences between these approaches can be significant, especially with large datasets.

When choosing an approach, consider factors such as:

* Performance requirements
* Browser support
* Code readability and maintainability
* Development time and expertise

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

Browser/OS: Firefox 90 on Windows

View result in a separate tab

Test name	Executions per second
For of + Push	27.2 Ops/sec
Map	70.6 Ops/sec

Related benchmarks:

ForOf+Push vs Map (version: 0)

Comparing performance of: For of + Push vs Map

Created: 3 years ago by: Guest

Jump to the latest result

For of + Push

Map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):