Benchmark: Array concat vs spread operator vs push____

Tests:

Array.prototype.concat
const params = [ ...Array(10000).keys() ]; const other = params.concat(10000);
spread operator
const params = [ ...Array(10000).keys() ] const other = [...params,10000 ]
Push
const params = [ ...Array(10000).keys() ]; params.push(10000);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The MeasureThat.net website is comparing the performance of three ways to concatenate an array: `Array.prototype.concat()`, the spread operator (`...`), and `push()`.

**Test Cases**

There are three test cases:

1. **`Array.prototype.concat()`**: This method concatenates two arrays using the `concat()` function.
2. **Spread Operator (`...`)**: This syntax is used to create a new array by spreading elements from an existing array or array-like object.
3. **`push()`**: This method adds one or more elements to the end of an array.

**Comparison**

The benchmark is comparing these three methods to see which one performs best in terms of execution speed.

**Pros and Cons:**

* **`Array.prototype.concat()`**:
	+ Pros: Easy to use, well-supported by browsers.
	+ Cons: Creates a new array object, can be slower than other methods due to overhead of creating a new object.
* **Spread Operator (`...`)**:
	+ Pros: Concise syntax, creates a new array without the overhead of creating an intermediate object.
	+ Cons: May not work as expected in older browsers or with certain array-like objects.
* **`push()`**:
	+ Pros: Fast and efficient way to append elements to an array.
	+ Cons: Can be slower than other methods for large arrays, as it involves modifying the existing array.

**Library/External Functionality**

None of the test cases use any external libraries or functions. They only rely on built-in JavaScript features.

**Special JS Features/Syntax**

The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It's supported by most modern browsers and Node.js versions, but may not work in older browsers or environments.

**Other Alternatives**

If you're looking for alternative ways to concatenate arrays, some other options include:

* `Array.prototype.slice().concat()`: This method creates a new array by slicing the original array and then concatenating it with another array.
* `Array.prototype.splice()`: This method can be used to add elements to an array, but may not be as efficient as using `push()`.

Keep in mind that these alternative methods may have different performance characteristics compared to the three methods being tested in this benchmark.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Firefox/68.0

Browser/OS: Firefox 68 on Mac OS X 10.14

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	3469.1 Ops/sec
spread operator	3730.2 Ops/sec
Push	6196.6 Ops/sec

Related benchmarks:

Array concat vs spread operator vs push____ (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):