Benchmark: Array.prototype.concat vs spread operator test 656524458

Tests:

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

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Suite status: <idle, ready to run>

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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 JSON and explain what's being tested, compared, and considered.

**What is being tested?**

MeasureThat.net is testing two approaches for merging arrays in JavaScript:

1. `Array.prototype.concat()`: The traditional method of concatenating arrays using the `concat()` function.
2. The new ES6 spread operator (`...`): A more modern and concise way of merging arrays, introduced in ECMAScript 2015.

**Options compared**

The benchmark compares the performance of these two approaches on a specific test case:

* The test case involves creating two arrays: `params` and `other`. `params` contains three elements (`"hello"`, `true`, and `7`) wrapped in quotes, while `other` is an empty array.
* The benchmark measures how many executions per second each approach can perform on this test case.

**Pros and Cons of the approaches**

1. **`Array.prototype.concat()`**
	* Pros:
		+ Wide support across older browsers and versions.
		+ Easy to understand and use for those familiar with the method.
	* Cons:
		+ May be slower than modern alternatives due to overhead from creating a new array object.
2. **The ES6 spread operator (`...`)**
	* Pros:
		+ Faster execution compared to `concat()`.
		+ More concise and readable, especially for merging small arrays.
		+ Modern syntax widely adopted in newer browsers and versions.
	* Cons:
		+ Requires a more modern JavaScript engine to execute.
		+ Less intuitive for those unfamiliar with the spread operator.

**Library usage**

There is no explicit library mentioned in the provided JSON. However, it's likely that the benchmark uses some internal implementation details of the `concat()` and spread operators.

**Special JS feature or syntax**

The ES6 spread operator (`...`) is a special syntax introduced in ECMAScript 2015. It allows for concise array merging by unpacking elements from existing arrays. This feature is not supported in older JavaScript engines, which explains why MeasureThat.net likely uses a modern browser or version.

**Alternatives**

Other alternatives to `Array.prototype.concat()` and the ES6 spread operator include:

* **`slice().concat()`**: A more explicit approach using the `slice()` function followed by concatenation.
* **`Array.prototype.push.apply()`**: A method that applies an array's `push()` function to another array, effectively merging them.
* **Other third-party libraries or polyfills**: Some libraries, like Lodash, offer alternative implementation details for array merging.

These alternatives may have different performance characteristics and trade-offs compared to the ES6 spread operator.

Related benchmarks:

Array.prototype.concat vs spread operator test 656524458 (version: 0)

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

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

Created: 3 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):