Benchmark: Array.prototype.concat vs spread operator 99

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]

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

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark definition for comparing two approaches: `Array.prototype.concat` and the spread operator (`...`). The benchmark is designed to measure the performance difference between these two methods when concatenating an array with another array containing variable-length parameters.

**Script Preparation Code and Html Preparation Code**

Since both scripts are simple, no preparation code is required. This means that the browser's default behavior will be used for execution.

**Individual Test Cases**

There are only two test cases:

1. **Array.prototype.concat**: This test case uses the `concat` method to concatenate an array with another array containing variable-length parameters (`"hello", true, 7`). The `concat` method creates a new array and returns it.
2. **Spread Operator**: This test case uses the spread operator (`...`) to concatenate an array with another array containing variable-length parameters (`"hello", true, 7`). The spread operator creates a new array by copying elements from the original array.

**Options Compared**

The two options being compared are:

* `Array.prototype.concat`
* Spread operator (`...`)

**Pros and Cons of Each Approach**

1. **Array.prototype.concat**:
	* Pros: It's a well-established, widely supported method for concatenating arrays.
	* Cons: It creates a new array, which can lead to performance issues when dealing with large arrays or frequent concatenations.
2. **Spread Operator (`...`)**:
	* Pros: It's a concise and modern way to concatenate arrays, without creating a new array.
	* Cons: It requires support for the spread operator in older browsers or versions of JavaScript.

**Library Usage**

In this benchmark, there is no explicit library usage. However, some modern JavaScript implementations might use internal libraries or polyfills under the hood to optimize performance.

**Special JS Features/Syntax**

There are no special features or syntax used in this benchmark that would require a deep understanding of advanced JavaScript concepts. The tests focus on the basic `concat` method and spread operator.

**Other Alternatives**

If you're looking for alternative approaches to concatenating arrays, consider:

* Using an array buffer (e.g., `Uint8Array`) instead of a typed array.
* Utilizing WebAssembly's built-in support for array concatenation.
* Employing a library like Lodash or Ramda, which provide optimized array manipulation functions.

Keep in mind that these alternatives might not be as straightforward to implement and understand as the spread operator or `concat` method.

Latest run results:

Run details: (Test run date: 14 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	9524652.0 Ops/sec
spread operator	37237900.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator 99 (version: 0)

Array.prototype.concat vs spread operator

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

Created: 15 days ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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