Benchmark: Simple array spread vs array push

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; params = [...params, 1]
spread operator
var params = [ "hello", true, 7 ] params.push(1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser/OS: Firefox 147 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	36898492.0 Ops/sec
spread operator	257935840.0 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 provided JSON for MeasureThat.net and explain what's being tested.

**Benchmark Definition**

The benchmark definition is null, which means that the test doesn't specify any specific algorithm or operation to be compared. Instead, it seems to be comparing two different approaches:

1. **Array spread operator**: The first approach uses the array spread operator (`[...params, 1]`) to create a new array by spreading the original array `params` and then appending the value `1`. This is equivalent to using the `concat()` method.
2. **Array push**: The second approach uses the `push()` method to add the value `1` to the end of the original array `params`.

**Options Compared**

The two options being compared are:

* Using the array spread operator (`[...params, 1]`)
* Using the `push()` method with an array literal (`params.push(1)`)

**Pros and Cons**

**Array Spread Operator:**

Pros:

* More concise and expressive
* Can be faster for large arrays since it avoids the overhead of creating a new array object

Cons:

* Less readable for some developers who are not familiar with this syntax
* May not work as expected in older browsers or environments that don't support this feature

**Array Push:**

Pros:

* More widely supported and understood by developers
* Easier to read and maintain, especially for those who prefer a more traditional approach

Cons:

* Can be slower since it involves creating a new array object, which can lead to additional memory allocations.

**Library Considerations**

None of the libraries are explicitly mentioned in this benchmark. However, if we consider the context, the `concat()` method is typically implemented using the `push()` method internally, so there's no significant difference in terms of performance or functionality.

**Special JS Features or Syntax**

The array spread operator (`[...params, 1]`) and the `push()` method with an array literal (`params.push(1)`) are both syntax features introduced in ECMAScript 2015 (ES6). These features provide a more concise way to create arrays and add elements, but may not work as expected in older browsers or environments.

**Other Alternatives**

If you wanted to compare these approaches using different methods, here are some alternatives:

* Using the `Array.prototype.slice()` method with the spread operator (`[...params.slice(), 1]`)
* Using a custom implementation of the array push operation
* Comparing the performance of other array manipulation techniques, such as `setInterval()`, `requestAnimationFrame()`, or WebAssembly-based solutions.

Keep in mind that each alternative would require significant changes to the benchmark definition and test cases.

Related benchmarks:

Simple array spread vs array push (version: 0)

Comparing performance of: Array.prototype.concat vs spread operator

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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