Benchmark: Array.prototype.concat vs spread operator (no jQuery)

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 ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**What is tested?**

The benchmark compares two approaches to concatenate arrays in JavaScript: `Array.prototype.concat()` and the new ES6 spread operator (`...`).

**Options compared**

Two options are compared:

1. **`Array.prototype.concat()```**: This method takes two or more arrays as arguments and returns a new array containing all elements from each input array.
2. **Spread operator (`...`)```**: This syntax allows you to expand an array (or any iterable) into individual elements when used in function calls, object literals, or other contexts.

**Pros and cons of each approach**

1. `Array.prototype.concat()`:
	* Pros: Widely supported, well-documented, and stable.
	* Cons: Can be slower than the spread operator, as it involves creating a new array with separate elements.
2. Spread operator (`...`)```:
	* Pros: Fast, efficient, and concise.
	* Cons: Requires modern JavaScript versions (ECMAScript 2015+) to work, and may not be supported by older browsers or environments.

**Library used**

There is no specific library mentioned in the benchmark configuration. However, it's worth noting that `Array.prototype.concat()` uses a built-in method on the Array prototype, while the spread operator (`...`) is a syntax feature introduced in modern JavaScript versions.

**Special JS feature/syntax**

The spread operator (`...`) is a special syntax feature introduced in ECMAScript 2015+. It allows you to expand an array (or any iterable) into individual elements when used in function calls, object literals, or other contexts. This syntax is not mentioned explicitly in the benchmark configuration, but it's implied by the use of `...` in the spread operator test case.

**Other alternatives**

There are other ways to concatenate arrays in JavaScript, such as using the `Array.prototype.push()` method with an array as an argument:

```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ].concat(params);
```

Or, using the `Array.prototype.splice()` method with an array as an argument:

```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ];
other.splice(0, 0, ...params);
```

However, these alternatives are not included in the benchmark configuration.

Related benchmarks:

Array.prototype.concat vs spread operator (no jQuery) (version: 0)

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

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

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

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):