Benchmark: Array.prototype.concat vs spread operator fork seb

Tests:

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

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 explain what's being tested.

**Benchmark Definition**

The benchmark compares three approaches for concatenating arrays in JavaScript:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...` )
3. Using the `push()` method with the spread operator (`params.push(...[ 1, 2 ])`)

**Options Compared**

The benchmark is comparing these three approaches to see which one is faster.

**Pros and Cons of Each Approach**

1. **Array.prototype.concat()**
	* Pros:
		+ Widely supported in older browsers
		+ Can be used with arrays created using other methods (e.g., `Array.from()` or `slice()`).
	* Cons:
		+ Creates a new array, which can lead to higher memory usage.
		+ May perform slower than the spread operator due to its method call overhead.
2. **ES6 Spread Operator (`...` )**
	* Pros:
		+ Fast and efficient
		+ Creates a new array with minimal memory allocation.
		+ Widely supported in modern browsers.
	* Cons:
		+ Introduced in ES6, so may not work in older browsers.
3. **Push with Spread Operator (`params.push(...[ 1, 2 ])` )**
	* Pros:
		+ Only modifies the existing array, reducing memory allocation.
		+ Faster than `concat()` because it avoids creating a new array.
	* Cons:
		+ May not be as widely supported in older browsers due to its use of the spread operator.

**Library and Special Features**

There are no libraries being used in this benchmark. However, note that the ES6 spread operator (`...` ) is a special feature introduced in modern JavaScript versions (ECMAScript 2015).

**Other Alternatives**

Alternative approaches for concatenating arrays include:

1. Using `Array.prototype.push()` multiple times: `params.push(1); params.push(2)`
2. Using `Array.prototype.splice()`: `params.splice(0, 0, 1, 2)`
3. Creating a new array using an array constructor (e.g., `[1, 2]`)

These alternatives may have different performance characteristics and memory usage compared to the approaches tested in this benchmark.

Overall, this benchmark is designed to help developers understand the performance differences between various methods for concatenating arrays in JavaScript.

Related benchmarks:

Array.prototype.concat vs spread operator fork seb (version: 0)

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

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

Created: 3 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):