Benchmark: Array.prototype.concat vs spread operatordsvsdxvseafawfawfawf

Tests:

Array.prototype.concat
var params = Array.from(Array(1000000).keys()); var other = [ 1, 2 ].concat(params);
spread operator
var params = Array.from(Array(1000000).keys()) var other = [ 1, 2, ...params ]

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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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**What is being tested?**

On MeasureThat.net, the provided JSON represents a JavaScript microbenchmark that compares two approaches for concatenating arrays: the traditional `concat()` method and the new ES6 spread operator (`...`). The benchmark aims to measure the performance difference between these two methods when used to concatenate an array of 1 million elements with an initial array containing only two elements.

**Options compared**

The test case uses two different approaches:

1. **Traditional `concat()` method**: This approach involves calling the `concat()` method on the initial array, passing in the new array as an argument.
2. **ES6 spread operator (`...`)**: This approach uses the spread operator to concatenate the arrays.

**Pros and Cons of each approach**

1. **Traditional `concat()` method**:
	* Pros: widely supported, easy to implement, and well-documented.
	* Cons: can be slower than other approaches due to the creation of a new array.
2. **ES6 spread operator (`...`)**:
	* Pros: concise, efficient, and takes advantage of modern JavaScript engines' capabilities.
	* Cons: may not work as expected in older browsers or environments that don't support the `...` syntax.

**Library used**

None is explicitly mentioned in the provided JSON. However, both approaches rely on built-in JavaScript functionality, which is the language's core library.

**Special JS feature or syntax**

The ES6 spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows for concise array creation and expansion. This syntax is supported by modern browsers and JavaScript engines but may not work as expected in older environments.

**Other alternatives**

While the `concat()` method is widely used, other approaches like using `Array.prototype.push()` or creating a new array with `Array.from()` are also possible. However, these alternatives might not provide the same level of performance as the traditional `concat()` method or the ES6 spread operator.

Here's an example of how you could create a new array with `Array.from()`, which is often considered a more efficient approach:
```javascript
var params = Array.from(Array(1000000).keys());
var other = Array(2).fill().map(() => 1) + params;
```
This alternative uses `Array.prototype.fill()` and `Array.prototype.map()` to create the initial array with two elements, then concatenates it with `params` using the spread operator (`+`).

Related benchmarks:

Array.prototype.concat vs spread operatordsvsdxvseafawfawfawf (version: 0)

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

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

Created: 7 years ago by: Guest

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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):