Benchmark: Large Array concat vs spread operator vs push 300 elements

Tests:

Array.prototype.concat
var params = new Array(300); var other = [ 1, 2 ].concat(params);
spread operator
var params = new Array(300); var other = [ 1, 2, ...params ]
Push
var params = new Array(300); 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

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

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Let's break down the benchmark and its test cases.

**Benchmark Definition**

The benchmark is designed to compare three different approaches for concatenating or spreading an array of 300 elements:

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

**Options Compared**

* `concat()`: a traditional method for concatenating arrays, which creates a new array by appending elements from one or more source arrays.
* Spread operator (`...`): a new syntax introduced in ES6 that allows you to expand an iterable (like an array) into individual elements, effectively spreading them out into a new array. In the context of `concat()`, it's used to spread the elements of the original array into the new array.
* `push()` with spread operator (`...`): a variation of the traditional `push()` method that uses the spread operator to append elements from an iterable (like an array) to the end of the current array.

**Pros and Cons**

Here's a brief summary:

* **concat()**:
	+ Pros: widely supported, well-documented, and familiar for developers.
	+ Cons: creates a new array, which can be inefficient for large datasets.
* **Spread operator (`...`)**:
	+ Pros: concise, efficient, and easy to read. It also avoids creating a new array by appending elements directly into the existing array.
	+ Cons: may not be supported in older browsers or environments, and it's still a relatively new syntax.
* `push()` with spread operator (`...`):
	+ Pros: similar to the spread operator approach but uses a more traditional method.
	+ Cons: creates a new temporary array, which can be inefficient for large datasets.

**Library**

None of the test cases use any external libraries.

**Special JS Features or Syntax**

The benchmark uses the new ES6 spread operator (`...`), which was introduced in ECMAScript 2015. This syntax allows you to expand an iterable into individual elements, making it a concise and efficient way to concatenate arrays.

**Other Alternatives**

If these approaches are not suitable for your use case, some alternative methods include:

* Using `Array.prototype.slice()` or `Array.prototype.splice()` to create a shallow copy of the original array.
* Using a `for` loop or a `forEach()` method to iterate over the elements and append them manually.
* Using a library like Lodash or Underscore.js, which provide additional utility functions for working with arrays.

Keep in mind that the choice of method depends on your specific requirements, such as performance, readability, and compatibility.

Related benchmarks:

Large Array concat vs spread operator vs push 300 elements (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: 3 years ago by: Guest

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):