Benchmark: Array concat vs spread operator vs push vs double spread

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 ]
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].push(...params);
double spread
var params = [ "hello", true, 7 ]; var other = [ 1, 2]; var other = [...other, ...params];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Overview**

The provided benchmark compares four approaches to concatenate arrays in JavaScript:

1. `concat()`
2. Spread operator (`...`)
3. `push()` with spread syntax (`...`)
4. Double spread syntax (`[...other, ...params]`)

The benchmark aims to determine which approach is the fastest.

**Options Compared**

Here's a brief description of each option:

* **Array.prototype.concat**: The traditional method for concatenating arrays using the `concat()` function.
* **Spread operator (`...`)**: A new feature introduced in ES6, allowing you to spread the elements of an array into another array.
* **`push()` with spread syntax (`...`)**: Using the `push()` method to add elements to an array and then spreading the result back into the original array.
* **Double spread syntax (`[...other, ...params]`)**: A variation of the spread operator that uses two sets of spread signs to concatenate arrays.

**Pros and Cons**

Here are some general pros and cons for each approach:

* `concat()`: Efficient and well-established method, but can be slower than modern alternatives.
	+ Pros: Easy to understand, widely supported.
	+ Cons: May not be optimized for performance.
* Spread operator (`...`): A concise way to concatenate arrays, with good performance.
	+ Pros: Modern syntax, efficient execution.
	+ Cons: Requires ES6 support (not older browsers).
* `push()` with spread syntax (`...`): Can be slower than the spread operator due to additional function calls.
	+ Pros: Still a modern approach, widely supported.
	+ Cons: May not be as efficient as the spread operator.
* Double spread syntax (`[...other, ...params]`): A unique approach that can lead to unexpected behavior if not used carefully.
	+ Pros: Innovative solution for specific use cases.
	+ Cons: Not as well-established or widely supported.

**Library Used**

None in this benchmark. The tests only rely on JavaScript features and syntax.

**Special JS Feature/Syntax**

The spread operator (`...`) is a new feature introduced in ES6 (2015). It allows you to create arrays from non-array values, like `var params = [ "hello", true, 7 ]; var other = [ 1, 2 ] ... params;`.

Note that there's no mention of any special JavaScript features or syntax beyond the spread operator.

**Other Alternatives**

In addition to the four approaches tested in this benchmark, some alternative methods for concatenating arrays include:

* Using `Array.prototype.slice()` and `Array.prototype.push()`: This approach can be slower than the modern alternatives.
* Using a `for` loop to iterate over one array and push elements into another: This approach can be slower due to the overhead of the loop.

Keep in mind that these alternative methods are not tested in this benchmark, but they might be worth exploring for specific use cases.

Overall, the MeasureThat.net benchmark provides a useful comparison of four approaches to concatenating arrays in JavaScript, highlighting the performance benefits of modern alternatives like the spread operator and double spread syntax.

Related benchmarks:

Array concat vs spread operator vs push vs double spread (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 vs double spread

Created: 3 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

double spread

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):