Benchmark: Array.prototype.concat vs spread operator

Tests:

Array.prototype.concat
var params = [ "hello", "good_bye", "well_then" ]; for(let i=0; i < 10; i++){ params = params.concat(params); }
spread operator
var params = [ "hello", "good_bye", "well_then" ]; for(let i=0; i < 10; i++){ params = [...params, ...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

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**What is being tested?**

The test compares two approaches for concatenating arrays in JavaScript:

1. The traditional `Array.prototype.concat()` method
2. The new ES6 spread operator (`...`)

The test aims to measure the performance difference between these two methods on a sample dataset of 10 elements.

**Options compared:**

The options being compared are:

* Traditional `Array.prototype.concat()`
* New ES6 spread operator (`...`)

**Pros and Cons:**

1. **Traditional `Array.prototype.concat()`**
	* Pros:
		+ Wide browser support
		+ Easy to implement for developers familiar with the method
	* Cons:
		+ Can be slower due to the need to create a new array object and copy elements from the original array
2. **New ES6 spread operator (`...`)**
	* Pros:
		+ Faster execution time, as it uses a more efficient algorithm that creates a new array with a single operation
		+ More concise and readable code
	* Cons:
		+ May not work in older browsers or environments that don't support ES6

**Library:**

There is no library being used in this test. The benchmark only involves JavaScript core functionality.

**Special JS feature or syntax:**

The test uses the new ES6 spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). This feature allows you to create a new array by spreading elements from an existing array.

**Other considerations:**

* The benchmark only measures performance for the specified sample dataset (10 elements).
* The results might not be representative of all use cases or scenarios.
* The test does not account for other factors that could affect performance, such as memory allocation or garbage collection.

**Alternative approaches:**

There are other ways to concatenate arrays in JavaScript, such as using `Array.prototype.push()` with `arguments`:

```javascript
var params = [ "hello", "good_bye", "well_then" ];
for (let i = 0; i < 10; i++) {
  params.push(...args);
}
```

However, this approach is not compared in the provided benchmark.

Other alternatives might include using libraries like Lodash or Underscore.js, which provide utility functions for array manipulation. However, these are not relevant to the specific test being performed.

Related benchmarks:

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

Compare the new ES6 spread operator with the traditional concat() method

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

Created: 8 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

No previous run results

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