Benchmark: Array concat vs spread operator vs push555

Tests:

Array.prototype.concat
var params = [ 3]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ 1, 2 ] var other = [ ...params, 3 ]
Push
var params = 2; var other = [ 1, 2 ].push(params);

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

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0

Browser/OS: Firefox 74 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	14137673.0 Ops/sec
spread operator	10433382.0 Ops/sec
Push	12760394.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview**

The provided JSON represents a JavaScript benchmark test on the MeasureThat.net website. The test compares three approaches for concatenating arrays: the traditional `concat()` method, the new ES6 spread operator (`...`), and the `push()` method.

**Benchmark Definition**

The benchmark definition specifies that the test will measure the performance of these three approaches in various scenarios. However, only three individual test cases are provided:

1. Concatenation using `concat()`: This tests how adding an array to another array using `concat()` affects performance.
2. Concatenation using spread operator (`...`): This tests how adding an array to another array using the spread operator affects performance.
3. Adding an element to an array using `push()`: This tests how appending a single element to an array using `push()` affects performance.

**Options Compared**

The test compares the following options:

* `concat()`: The traditional method for concatenating arrays.
* Spread operator (`...`): The new ES6 syntax for creating a copy of an array and adding elements to it.
* `push()`: The method for appending one or more elements to an existing array.

**Pros and Cons**

Here are some pros and cons associated with each approach:

* `concat()`:
	+ Pros: Widely supported, easy to read and write.
	+ Cons: Creates a new array, which can lead to increased memory usage.
* Spread operator (`...`):
	+ Pros: Efficient way to add elements to an array without creating a new one. Modern browsers support it well.
	+ Cons: May require additional features (e.g., modern JavaScript versions) and syntax changes for developers.
* `push()`:
	+ Pros: Efficient way to append elements to an existing array, reducing memory allocations.
	+ Cons: May not be as readable or maintainable as the other two options.

**Library**

None of the provided test cases use a specific library. However, MeasureThat.net might use some underlying libraries or frameworks that are not explicitly mentioned in the JSON data.

**Special JavaScript Feature/Syntax**

The `...` spread operator is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for creating a copy of an array and adding elements to it without modifying the original array. The test uses this syntax to compare its performance with other methods.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are some additional options:

* `Array.prototype.slice()`: This method creates a shallow copy of an array and returns it, which can be used as an intermediate step before adding elements.
* `Array.prototype.push.apply()`: This method applies the `push()` operation to an array by creating a new array from the given arguments and then assigning it to the original array.

Keep in mind that these alternatives might have similar performance characteristics or differences with the methods tested on MeasureThat.net.

Related benchmarks:

Array concat vs spread operator vs push555 (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: 4 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 2 months ago):