Benchmark: Array.prototype.concat vs spread operator sans 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:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0

Browser/OS: Firefox 60 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	12698438.0 Ops/sec
spread operator	11161550.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is designed to compare two approaches for merging arrays in JavaScript:

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

**Options Compared**

The two options are compared in terms of their performance, which is measured by the number of executions per second (ExecutionsPerSecond).

**Pros and Cons**

* **Array.prototype.concat()**:
	+ Pros: widely supported, easy to use, and well-documented.
	+ Cons: can be slower than the spread operator, especially for large arrays.
* **Spread Operator (`...`)**:
	+ Pros: faster and more efficient, especially for large arrays, since it avoids creating a new array object and instead modifies the original array's length property.
	+ Cons: requires support for the ES6 spread operator syntax, which might not be present in older browsers or environments.

**Library**

There is no library explicitly mentioned in the benchmark definition. However, the benchmark does use the `concat()` method, which is a built-in JavaScript method.

**Special JS Feature/Syntax**

The spread operator (`...`) is a new feature introduced in ES6 (ECMAScript 2015). It allows you to expand an array or object into a new array or object. In this benchmark, it's used to merge two arrays by spreading the elements of one array into another.

**Other Considerations**

When choosing between `Array.prototype.concat()` and the spread operator, consider the size and type of data being merged. For large arrays or performance-critical applications, the spread operator might be a better choice. However, for small arrays or simple concatenation tasks, the more straightforward approach of using `concat()` might be sufficient.

**Alternatives**

If you're interested in exploring alternative approaches, consider:

* Using other array methods like `push()`, `unshift()`, and `slice()`.
* Implementing a custom merge function to compare with the spread operator.
* Experimenting with different JavaScript engines or environments to see how they affect performance.

Keep in mind that the benchmark definition is designed to test specific scenarios, so exploring alternative approaches might require creating new benchmark definitions.

Related benchmarks:

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

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

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

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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