Benchmark: Array concat vs spread full array operator vs push

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var params2 = [1, 2, 3, 4] var other = params2.concat(params);
spread operator
var params = [ "hello", true, 7 ]; var params2 = [1, 2, 3, 4] var other = [ ...params2, ...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 benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark compares three approaches for concatenating arrays in JavaScript:

1. **`concat()` method**: The traditional way of concatenating arrays using the `concat()` method.
2. **Spread operator (`...`) with array destructuring**: A new ES6 feature that allows you to spread elements from an array onto another array using the `...` syntax.
3. **Pushing elements onto the original array**: Using the `push()` method to add elements to the original array.

**What's being compared?**

The benchmark is testing which approach has a better performance for concatenating arrays.

**Options compared:**

* **`concat()` method**: A traditional way of concatenating arrays.
* **Spread operator (`...`) with array destructuring**: A new ES6 feature that allows you to spread elements from an array onto another array.
* **Pushing elements onto the original array**: Using the `push()` method to add elements to the original array.

**Pros and Cons:**

1. **`concat()` method**:
	* Pros: Widely supported, easy to understand, and well-documented.
	* Cons: Creates a new array object, which can be inefficient for large arrays.
2. **Spread operator (`...`) with array destructuring**:
	* Pros: More efficient than `concat()`, creates a new array object only when necessary.
	* Cons: Requires ES6 support and modern browsers.
3. **Pushing elements onto the original array**:
	* Pros: Most efficient, as it modifies the original array without creating a new one.
	* Cons: May not be suitable for all use cases (e.g., when you need to preserve the original array).

**Other considerations:**

* The benchmark is designed to test performance, so the best approach will depend on the specific requirements of your project.
* If you're working with large arrays and need to concatenate them frequently, the spread operator or `push()` method might be a better choice.

**Library usage:**

None of the provided benchmarks use external libraries. The examples only demonstrate basic JavaScript syntax.

**Special JS features or syntax:**

The benchmark uses ES6 syntax (spread operator) and assumes that the JavaScript engine supports it. If you're running an older version of JavaScript, this benchmark might not be compatible.

Now, let's look at the individual test cases:

1. **`Array.prototype.concat()`**
This test case creates two arrays, `params` and `params2`, and concatenates them using the `concat()` method.
```javascript
var params = [ "hello", true, 7 ];
var params2 = [1, 2, 3, 4];
var other = params2.concat(params);
```
The benchmark runs this test case multiple times to gather performance data.

2. **Spread operator (`...`) with array destructuring**
This test case creates two arrays, `params` and `params2`, and concatenates them using the spread operator.
```javascript
var params = [ "hello", true, 7 ];
var params2 = [1, 2, 3, 4];
var other = [ ...params2, ...params ];
```
Again, the benchmark runs this test case multiple times to gather performance data.

**Other alternatives:**

If you're looking for alternative approaches to concatenating arrays, consider using:

* **`Array.prototype.push()`**: As mentioned earlier, pushing elements onto the original array is a very efficient way of concatenation.
* **`Set` data structure**: If you need to combine arrays without duplicates, consider using a `Set`.
* **`Array.from()`**: This method creates a new array from an iterable (e.g., another array).

Related benchmarks:

Array concat vs spread full array operator vs push (version: 0)

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

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>

Fastest: N/A

Slowest: N/A

No previous run results

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