Benchmark: Array concat vs spread operator vs push with random array 10000

Script Preparation code:

function randomArray(length, max) {
    return Array.apply(null, Array(length)).map(function() {
        return Math.round(Math.random() * max);
    });
}
var arr = randomArray(10000, 15);

Tests:

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

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:

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

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Let's break down the provided benchmark test cases.

**Benchmark Definition**

The main goal of this benchmark is to compare three methods for adding an element to an array:

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

These methods are used to add a single element (in this case, `1`) to the end of an array created with 10,000 random integers.

**Options Compared**

The benchmark compares the performance of these three methods:

* `Array.prototype.concat()`: A traditional method for concatenating arrays.
* The new ES6 spread operator (`...`): A syntax introduced in modern JavaScript versions that allows creating a new array by spreading an existing array or values.
* The `push()` method: A simple way to add an element to the end of an array.

**Pros and Cons**

Here are some general pros and cons for each approach:

* `Array.prototype.concat()`:
	+ Pros: Well-established, easy to understand, and widely supported across browsers.
	+ Cons: Can be slower than other methods due to its overhead.
* The new ES6 spread operator (`...`):
	+ Pros: Modern syntax, efficient, and widely supported in modern browsers.
	+ Cons: Requires a relatively recent JavaScript version (ES6+) to work.
* `push()` method:
	+ Pros: Simple, fast, and widely supported across browsers.
	+ Cons: Not as well-established or readable as the other two methods.

**Library/Utility Functions**

In this benchmark, there is no specific library or utility function being used. The focus is solely on comparing the performance of three native JavaScript methods.

**Special JS Features/Syntax**

The benchmark uses the new ES6 spread operator (`...`), which was introduced in modern JavaScript versions (ES6+). This syntax allows creating a new array by spreading an existing array or values. It's a relatively recent feature, and its use is optional.

**Alternatives**

If you wanted to test these methods on older browsers that don't support the ES6 spread operator, you could modify the benchmark to use a different method, such as:

* `Array.prototype.slice()`: A way to create a new array by copying an existing one.
* `Array.prototype.splice()`: A way to add or remove elements from an array.

Keep in mind that these alternatives would likely change the performance characteristics of the benchmark.

Related benchmarks:

Array concat vs spread operator vs push with random array 10000 (version: 2)

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: 6 years ago by: Registered User

Jump to the latest result

Array.prototype.concat

spread operator

Push

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):