Benchmark: Array.prototype.concat vs spread operator 3

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Array.prototype.concat

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches to merge arrays in JavaScript:

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

**Options Compared**

The test case uses a simple array merging scenario, where an initial array `a` is merged with another array `other`, and some additional values are added using the spread operator.

**Pros and Cons of Each Approach:**

1. **Spread Operator (`...`)**:
	* Pros:
		+ More concise and expressive syntax.
		+ Does not create a new array, but rather modifies the original one in-place.
	* Cons:
		+ May be slower due to the overhead of creating an array view on the original array.
2. **Array.prototype.concat()**:
	* Pros:
		+ Well-established and widely supported method.
		+ Can handle larger arrays more efficiently than the spread operator.
	* Cons:
		+ More verbose syntax, which may be less readable.

**Library/Functionality Used**

None in this specific benchmark. However, it's worth noting that both approaches rely on JavaScript's array prototype methods (`Array.prototype.concat()` and `Array.prototype.push()`, implicitly).

**Special JS Feature/Syntax**

The spread operator is a new feature introduced in ES6 (ECMAScript 2015). It allows for more concise array merging and creation. The benchmark highlights the performance difference between this new syntax and the traditional `concat()` method.

**Other Alternatives**

If you wanted to compare other approaches, some alternatives could be:

* Using `Array.prototype.push()` with multiple arguments: `a.push(...other, "literal", ...params)`.
* Using a custom function or library for array merging.
* Using a different data structure, such as an object or a linked list.

Keep in mind that these alternatives might not offer significant performance gains over the spread operator and `concat()` methods, depending on the specific use case.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser/OS: Chrome 71 on Windows

View result in a separate tab

Test name	Executions per second
spread operator	12735270.0 Ops/sec
Array.prototype.concat	1501762.9 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator 3 (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

spread operator

Array.prototype.concat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):