Benchmark: React State Push vs Spread Operator lsit

Tests:

Spread opperator
let list = [] const item = "item"; list = [...list, item]
Push
let list = [] const item = "item"; list.push(item)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread opperator
Push

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Overview**

The website MeasureThat.net allows users to create and run JavaScript microbenchmarks. The benchmark in question tests two approaches for adding an item to an empty array: using the spread operator (`...`) versus the `push()` method.

**Benchmark Definition**

The benchmark definition consists of a JSON object with the following properties:

* `Name`: The name of the benchmark, which is "React State Push vs Spread Operator list".
* `Description`: An optional description of the benchmark, but it's empty in this case.
* `Script Preparation Code` and `Html Preparation Code`: These properties are also empty, indicating that no specific script or HTML code needs to be prepared before running the benchmark.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Test Case 1: Spread Operator**
	* The `Benchmark Definition` is a JavaScript statement that creates an empty array `list` and then uses the spread operator (`...`) to add an item `"item"` to the array.
	* The `Test Name` is "Spread opperator".
2. **Test Case 2: Push**
	* The `Benchmark Definition` is another JavaScript statement that creates an empty array `list` and then uses the `push()` method to add an item `"item"` to the array.
	* The `Test Name` is simply "Push".

**Library**

Neither of these test cases relies on any external libraries. They only use built-in JavaScript features.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark that would require explanation beyond their basic usage.

**Options Compared**

The two test cases compare the performance of:

1. **Spread Operator (`...`)**: This method uses the spread operator to create a new array by copying elements from an existing array.
2. **Push Method**: This method modifies the original array by adding a new element at the end of it.

**Pros and Cons**

* **Spread Operator (...)
	+ Pros:
		- Can be more efficient for small arrays, as it avoids the overhead of modifying the original array.
		- Can be useful when working with immutable data structures.
	+ Cons:
		- May have performance implications when dealing with large arrays.
		- Can lead to slower execution times compared to the `push()` method in some cases.
* **Push Method**
	+ Pros:
		- More efficient for large arrays, as it avoids creating a new array and instead modifies the existing one.
		- Typically faster execution times compared to the spread operator.
	+ Cons:
		- May modify the original array, which can be undesirable in some cases.
		- Can lead to slower execution times when working with small arrays.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Size of the array: For large arrays, the `push()` method is likely to be faster. For small arrays, the spread operator might have a slight performance advantage.
* Data structure requirements: If you're working with immutable data structures, the spread operator might be a better choice. If you need to modify the original array, the `push()` method is more suitable.

**Alternatives**

Other approaches for adding an item to an empty array include:

* Using the `concat()` method: `list.concat([item])`
* Creating a new array using the `Array.from()` method: `Array.from([], (x) => x + item)`
* Using a library like Lodash's `assignIn()` function

However, these alternatives might have different performance characteristics or requirements compared to the spread operator and `push()` methods.

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/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
Spread opperator	62889896.0 Ops/sec
Push	127097688.0 Ops/sec

Related benchmarks:

React State Push vs Spread Operator lsit (version: 0)

Comparing performance of: Spread opperator vs Push

Created: 3 years ago by: Guest

Jump to the latest result

Spread opperator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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