Benchmark: Add new array to array: push vs concat

Tests:

spread operator
var myArray = [ "hello", true, 7 ] var myOtherArray = ['new'] var other = myArray.concat(myOtherArray)
Push
var myArray = [ "hello", true, 7 ] var myOtherArray = ['new'] myArray.push(...myOtherArray);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark definition and test cases to explain what's being tested, the options compared, their pros and cons, and other considerations.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark is defined as follows:

* **Name**: "Add new array to array: push vs concat"
* **Description**: None
* **Script Preparation Code**: None (the code is expected to be provided by the test user)
* **Html Preparation Code**: None

This benchmark is focused on comparing two approaches for adding a new array to an existing array:

1. Using the `concat()` method
2. Using the spread operator (`...`)

**Individual Test Cases**

There are two individual test cases in this benchmark:

1. **Test Name: "spread operator"**
The script definition for this test case is:
```javascript
var myArray = [ "hello", true, 7 ];
var myOtherArray = ['new'];
myArray.push(...myOtherArray);
```
This code creates two arrays, `myArray` and `myOtherArray`, and then uses the spread operator to add all elements from `myOtherArray` to `myArray`.

2. **Test Name: "Push"**
The script definition for this test case is:
```javascript
var myArray = [ "hello", true, 7 ];
var myOtherArray = ['new'];
myArray.push(myOtherArray);
```
This code creates two arrays, `myArray` and `myOtherArray`, and then uses the `push()` method to add a reference to `myOtherArray` to the end of `myArray`.

**Options Compared**

The two test cases compare the performance of:

1. **Spread Operator (`...`)**: This approach creates a new array by copying all elements from `myOtherArray`.
2. **Push with Array Reference**: This approach adds an array reference to `myArray` using the `push()` method.

**Pros and Cons**

* **Spread Operator (`...`)**:
	+ Pros:
		- Creates a new array, which can be more efficient in certain scenarios.
		- Can lead to better performance due to shorter method calls.
	+ Cons:
		- Requires JavaScript 8 or later support (ES6+).
		- May not work as expected with older browsers or environments.
* **Push with Array Reference**:
	+ Pros:
		- Works with all JavaScript versions, including older ones.
		- Can be more flexible when working with arrays of different types.
	+ Cons:
		- Creates a new array reference on each push operation, which can lead to memory overhead.

**Other Considerations**

* **Library**: Neither of these approaches relies on any external libraries. They are pure JavaScript implementations.
* **Special JS Feature/Syntax**: The spread operator (`...`) is a modern JavaScript feature introduced in ES6+. If the benchmark were run on older environments that don't support this syntax, it would not work as intended.

**Alternatives**

If you're interested in exploring alternative approaches for adding new arrays to existing ones, here are some options:

* Using `Array.prototype.push.apply()` instead of `push()`: This method allows passing an array or other iterable as an argument.
* Using `Array.prototype.unshift()` instead of `concat()` and then `push()`: This method adds elements to the beginning of the array.
* Implementing a custom loop or recursive function to add elements from one array to another.

Keep in mind that these alternatives might not provide the same performance benefits as the spread operator or push with array reference, depending on the specific use case.

Related benchmarks:

Add new array to array: push vs concat (version: 0)

Comparing performance of: spread operator vs Push

Created: 2 years ago by: Guest

Jump to the latest result

spread operator

Push

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):