Benchmark: Array methods for adding a single element

Script Preparation code:

var hello = "Hello";
var world = ["Is", "it", "me", "you're", "looking", "for"];

Tests:

Push
world.push(hello);
Concat
world.concat(hello)
Spread
[...world, hello]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
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 benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Overview**

The benchmark measures the performance of three different methods for adding a single element to an array:

1. `world.push(hello)`
2. `world.concat(hello)`
3. `[...world, hello]` (using spread syntax)

These methods are compared on various browsers and devices.

**Library Used**

The benchmark uses the built-in JavaScript arrays (`Array`) without any additional libraries or dependencies.

**Special JS Feature/Syntax**

None mentioned in this specific benchmark. However, it's worth noting that some of these methods might use internal optimizations or special features like:

* `push` method: Might use a simple increment operation on an array's length property.
* `concat` method: Creates a new array and copies the original elements into it, then returns a reference to this new array. This can be optimized by reusing the original array if possible.
* Spread syntax (`[...world, hello]`): Creates a new array with a spread operation, which is syntactic sugar for calling `Array.prototype.push.apply()`. The actual implementation might use a different optimization.

**Comparison Options**

The benchmark compares three different methods:

1. **Push**: Uses the `push()` method to add an element to the end of the array.
2. **Concat**: Uses the `concat()` method to create a new array with the original elements and the added element.
3. **Spread**: Uses the spread syntax (`[...world, hello]`) to create a new array with the original elements and the added element.

**Pros/Cons**

Here's a brief summary of each approach:

* **Push**:
	+ Pros: Efficient use of memory, simple and concise implementation.
	+ Cons: Might be slower due to the increment operation on `length` property.
* **Concat**:
	+ Pros: Can reuse the original array if possible, which might improve performance.
	+ Cons: Creates a new array, which can lead to increased memory allocation and copying.
* **Spread**:
	+ Pros: Syntactic sugar for `push.apply()`, which is an efficient way to add elements to an array.
	+ Cons: Might be slower due to the creation of a new array.

**Other Considerations**

When choosing between these methods, consider the following factors:

* Performance: If performance is critical, using `push()` might be faster due to its simple implementation. However, if you need to reuse the original array, `concat()` or spread syntax might be better.
* Code readability and maintainability: Spread syntax can make code more concise and readable, especially when working with large arrays. However, it may also add cognitive overhead for some developers.

**Alternatives**

Other methods for adding an element to an array include:

* Using a binary search tree (BST) data structure, which can provide efficient insertion operations.
* Using a linked list data structure, which can provide efficient insertion and removal operations at the beginning or end of the list.
* Using a dynamic array data structure, like `Array.prototype.set()` (not supported in modern browsers), which can provide efficient insertion and update operations.

Keep in mind that these alternatives are typically used in more complex scenarios than this benchmark. The comparison between `push()`, `concat()`, and spread syntax is likely intended to demonstrate the performance differences between these methods for a simple use case.

Related benchmarks:

Array methods for adding a single element (version: 0)

Comparing performance of: Push vs Concat vs Spread

Created: 3 years ago by: Guest

Jump to the latest result

Push

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):