Benchmark: Array.prototype.concat vs spread operator larche

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

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

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

**Benchmark Definition**

The benchmark definition json contains two main components:

1. **Script Preparation Code**: This is an empty string, which means that no custom JavaScript code needs to be executed before running the benchmark tests.
2. **Html Preparation Code**: This is also an empty string, indicating that no HTML code needs to be prepared for the benchmark.

**Individual Test Cases**

The benchmark defines two individual test cases:

1. **Array.prototype.concat**
	* The benchmark definition code uses the traditional `concat()` method to concatenate two arrays: `[ 1, 2 ]` and another array containing three elements: `"hello"`, `true`, and `7`.
	* This is a common use case for the `concat()` method.
2. **Spread Operator**
	* The benchmark definition code uses the new ES6 spread operator (`...`) to concatenate two arrays: `[ 1, 2 ]` and another array containing three elements: `"hello"`, `true`, and `7`.
	* This is an example of using the spread operator to merge arrays.

**Library Usage**

There are no explicit libraries mentioned in the benchmark definition. However, it's possible that the benchmark uses built-in JavaScript functionality or standard library functions.

**Special JS Features/Syntax**

The benchmark defines two test cases:

1. **Array.prototype.concat**: This is a standard method on the Array prototype in JavaScript.
2. **Spread Operator**: The spread operator (`...`) was introduced in ES6 (ECMAScript 2015) and has become a common syntax in modern JavaScript.

**Pros and Cons of Different Approaches**

Here's a brief analysis of the pros and cons of using `concat()` versus the spread operator:

* **Concat()**
	+ Pros:
		- Well-established method with good browser support.
		- Can be used to concatenate arrays with other array-like objects (e.g., numbers, strings).
	+ Cons:
		- Can lead to slower performance compared to spread operators for large datasets.
		- Not as concise or readable in some cases.
* **Spread Operator**
	+ Pros:
		- More concise and readable than `concat()`.
		- Faster performance for large datasets (due to the optimized implementation).
	+ Cons:
		- Less widely supported in older browsers.
		- May be less familiar to developers without exposure to ES6 features.

**Other Alternatives**

If you're interested in comparing other array concatenation methods, here are a few alternatives:

* **Array.prototype.push()**: This method modifies the original array by appending elements. It's not suitable for creating new arrays.
* **Array.prototype.slice()**: This method creates a shallow copy of the array, but it can be slower than spread operators for large datasets.

In summary, the benchmark is testing two common use cases for concatenating arrays in JavaScript: using `concat()` versus the spread operator. The results will help determine which approach is faster and more efficient.

Related benchmarks:

Array.prototype.concat vs spread operator larche (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):