Benchmark: 31231331c13 - MeasureThat.net

Tests:

Array.prototype.concat
var params = [1,2,3,4,5,6,7,8,9,10, {a: 1}, {b:2, v:4},4,2 ]; var other = [ {c: 54} ].concat(params);
spread operator
var params = [1,2,3,4,5,6,7,8,9,10, {a: 1}, {b:2, v:4},4,2 ]; var other = [ 1, ...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:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	7355849.5 Ops/sec
spread operator	14453675.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**
The benchmark is defined by two test cases: `Array.prototype.concat` and `spread operator`. The benchmark compares the performance of using the traditional `concat()` method to merge arrays with the new ES6 spread operator (`...`) in JavaScript.

**Options Compared**

1. **Traditional `concat()` Method**: This approach uses the `concat()` method, which creates a new array by merging two or more arrays.
```javascript
var other = [ {c: 54} ].concat(params);
```
2. **ES6 Spread Operator (`...`)**: This approach uses the spread operator to create a new array by spreading the elements of another array.

**Pros and Cons**

1. **Traditional `concat()` Method**:
	* Pros:
		+ Wide support across browsers and versions.
		+ Often used in legacy codebases or when compatibility is crucial.
	* Cons:
		+ Creates a new array, which can lead to performance overhead.
2. **ES6 Spread Operator (`...`)**:
	* Pros:
		+ More concise and expressive way of merging arrays.
		+ Generally faster than `concat()` since it avoids creating an intermediate array.
	* Cons:
		+ May not work as expected in older browsers or versions.

**Library Used**
In both test cases, no external libraries are used. The benchmark focuses solely on the built-in JavaScript features being compared.

**Special JS Feature/Syntax (None)**
There is no special JavaScript feature or syntax being tested beyond the spread operator and `concat()` method.

**Other Alternatives**

1. **Array.prototype.push()**: Another way to merge arrays by using `push()` instead of `concat()`.
```javascript
var other = [ {c: 54} ];
other.push(...params);
```
2. **Array.prototype.set()**: A newer alternative (introduced in ECMAScript 2021) that merges arrays without creating a new one.
```javascript
var other = [ {c: 54} ].set(0, ...params);
```
However, this method is not widely supported yet.

**Benchmark Preparation Code and HTML Preparation Code**
Both `Script Preparation Code` and `Html Preparation Code` are set to `null`, indicating that no custom code or HTML structure is needed for the benchmark.

Now you should have a good understanding of what's being tested in this benchmark and how it compares different approaches to merging arrays in JavaScript.

Related benchmarks:

31231331c13 (version: 0)

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

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

Created: one year 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 Summary (model llama3.2:3b, generated one month ago):