Benchmark: spread vs forEach push v3

Script Preparation code:

var arr = Array.from(Array(1000).keys())

Tests:

spread
var brr = [...arr]
forEach push
var drr = [] var err = [] arr.forEach(item => { drr.push(item) })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
forEach push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spread	6408371.0 Ops/sec
forEach push	304354.3 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 is being tested.

**What is being tested:**
The benchmark measures the performance difference between two approaches:

1. Using the spread operator (`...`) to create a new array from an existing array (`arr`).
2. Using the `forEach()` method with the `push()` method to iterate over an array and add elements to another array (`drr`).

**Options compared:**
The benchmark compares the performance of two approaches:

* `spread`: Using the spread operator (`...`) to create a new array from `arr`.
* `forEach push`: Using the `forEach()` method with `push()` to iterate over `arr` and add elements to `drr`.

**Pros and Cons:**

* **Spread Operator (`...`)**:
	+ Pros: Efficient, concise, and easy to read. It creates a new array without modifying the original one.
	+ Cons: May have slower performance due to the overhead of creating a new array.
* `forEach()` method with `push()`: 
	+ Pros: Can be more efficient for large datasets since it modifies the original array in place, reducing memory allocation.
	+ Cons: More verbose and less readable compared to the spread operator.

**Library and special JS features used:**
In this benchmark, no specific JavaScript libraries are mentioned. However, the use of `Array.from()` suggests that modern JavaScript versions (ECMAScript 2015+) are being tested.

**Other considerations:**

* **Browser differences:** The benchmark results show variations between browsers (Chrome 124) and device platforms (Desktop). This highlights the importance of considering browser-specific optimizations when writing performance-critical code.
* **Dataset size:** The benchmark uses an array with 1000 elements, which might be too small for large datasets. For larger datasets, other factors like caching and memory allocation may become more significant.

**Alternatives:**
Other approaches to achieve similar results could include:

* Using `map()` instead of `forEach()` with `push()`
* Utilizing libraries like Lodash or Underscore.js that provide optimized iteration methods
* Exploring alternative data structures, such as linked lists or binary search trees, for efficient insertion and traversal

Related benchmarks:

spread vs forEach push v3 (version: 1)

Comparing performance of: spread vs forEach push

Created: 2 years ago by: Registered User

Jump to the latest result

spread

forEach push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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