Benchmark: push vs spread (reduce array)

Script Preparation code:

var data = [...Array.from(Array(10000).keys())]

Tests:

spread
data.reduce((acc, curr) => [...acc, curr],[])
push
data.reduce((acc, curr) => (acc.push(curr),acc),[])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
push

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark measures the performance difference between two approaches: using the `push` method to add elements to an array, versus using the spread operator (`...`) with the `reduce` method.

**Options Compared**

Two options are compared:

1. **Push**: This approach uses the `push` method to add each element of the array to the end of the accumulator array.
2. **Spread**: This approach uses the spread operator (`...`) with the `reduce` method to create a new array by spreading the elements of the input array into the accumulator array.

**Pros and Cons**

* **Push**: Pros:
	+ Simple and straightforward implementation
	+ Works well for small arrays or performance-critical code
* Cons:
	+ Can be slower than other approaches, especially for large arrays, due to the overhead of pushing each element individually
* **Spread**: Pros:
	+ More concise and expressive syntax
	+ Can be faster than push for large arrays, since it avoids the overhead of individual pushes
* Cons:
	+ May have additional overhead due to string slicing (if `Array.from()` is used) or object creation (for other spread implementations)
	+ Less intuitive implementation for developers unfamiliar with array manipulation

**Library**

In this benchmark, `Array.from()` is used to create an array of numbers from 0 to 9,999. This library is a built-in JavaScript function that creates a new array by mapping over the input iterable.

**Special JS Feature or Syntax**

The use of `...` (spread operator) and `reduce()` is a modern JavaScript feature. The spread operator was introduced in ECMAScript 2015, and `reduce()` has been part of the language since ECMAScript 2009.

**Other Considerations**

* The benchmark uses a mobile Safari 16 browser, which may have different performance characteristics than desktop browsers.
* The device platform (mobile) and operating system (iOS) can also impact performance.
* The number of executions per second is used as a metric to compare the performance of the two approaches.

**Other Alternatives**

Some alternative approaches that could be tested in this benchmark include:

* Using `concat()` instead of `push`
* Using a custom implementation that avoids array manipulation
* Testing different initial values for the accumulator array
* Comparing the performance of different JavaScript engines or versions

These alternatives would require additional modifications to the benchmark definition and script preparation code.

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.3 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 16 on iOS 16.3.1

View result in a separate tab

Test name	Executions per second
spread	4.4 Ops/sec
push	18774.5 Ops/sec

Related benchmarks:

push vs spread (reduce array) (version: 0)

Comparing performance of: spread vs push

Created: 10 months ago by: Guest

Jump to the latest result

spread

push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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