Benchmark: array concat vs spread 2

Script Preparation code:

var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];

Tests:

concat
// arr2 의 모든 항목을 arr1 에 붙임 arr1 = arr1.concat(arr2);
spread
arr1 = [...arr1, ...arr2];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread

Fastest: N/A

Slowest: N/A

Latest run results:

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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 data and explain what's being tested.

**Benchmark Definition**
The `Name` field indicates that this benchmark is called "array concat vs spread 2". The `Description` field is empty, which means there isn't a detailed description of the benchmark. The `Script Preparation Code` section sets up two arrays, `arr1` and `arr2`, with some initial values.

**Options being compared**
The benchmark compares two ways to concatenate (join) or spread (`...`) two arrays: `concat()` and the spread operator (`...`). In JavaScript, both methods can be used to merge arrays, but they have different performance characteristics.

**Pros and Cons of each approach**

1. **`concat()` method**:
	* Pros:
		+ Widely supported across different browsers and versions.
		+ Easy to understand and use for developers who are already familiar with it.
	* Cons:
		+ Creates a new array object, which can lead to increased memory usage and slower performance compared to spreading arrays.
2. **Spread operator (`...`)**:
	* Pros:
		+ More efficient than `concat()` because it avoids creating a new array object.
		+ Can be used with other array methods (e.g., `map()`, `filter()`) for more complex operations.
	* Cons:
		+ Requires support for modern JavaScript features, which might not be available in older browsers or versions.

**Library and its purpose**
There is no library mentioned in the provided JSON data. However, if you're interested in understanding the broader context of this benchmark, it's worth noting that `concat()` and spread operator performance are often compared because they represent different approaches to merging arrays in JavaScript.

**Special JS feature or syntax**
The benchmark uses modern JavaScript features like the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6).

Now, let's discuss other alternatives:

1. **Array.prototype.push()**: Another way to concatenate arrays by using the `push()` method.
2. **Array.prototype.unshift()**: A less common approach that uses the `unshift()` method to prepend elements to an array.

While these alternatives exist, they are not directly compared in this benchmark. If you're interested in exploring them further, I can provide more information on their performance characteristics and usage scenarios.

Related benchmarks:

array concat vs spread 2 (version: 0)

Comparing performance of: concat vs spread

Created: 5 years ago by: Guest

Jump to the latest result

concat

spread

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):