Benchmark: Spread VS Push (Single element)

HTML Preparation code:


<div id=''></div>

Tests:

1
const arr = [1, 2,3] arr.push(4)
2
const arr = [1, 2,3] const arr1 = [...arr, 4]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

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Test case name	Result
1
2

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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I'll break down the provided JSON data and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Definition**

The benchmark definition is a simple JavaScript code snippet that creates an array `arr` with three elements and then either pushes another element onto the array using `push()` or uses the spread operator (`...`) to create a new array with the original array plus an additional element.

The two test cases are:

1. Using `push()`: `const arr = [1, 2,3]; arr.push(4);`
2. Using the spread operator: `const arr = [1, 2,3]; const arr1 = [...arr, 4];`

**Comparison**

In both test cases, the resulting array is the same (`[1, 2, 3, 4]`). However, the underlying implementation differs.

The first test case uses a method call to push an element onto the end of the array. This approach is generally considered slower than the spread operator because it involves multiple operations:

* Creating a new property on the array object
* Updating the `length` property of the array object
* Copying the elements from the original array to the newly created property

The second test case uses the spread operator (`...`) to create a new array with the original array plus an additional element. This approach is generally faster because it:

* Creates a new array object with a reference to the original array
* Copies only the new element to the end of the new array, without modifying the original array

**Pros and Cons**

Here are the pros and cons of each approach:

1. Using `push()`:
	* Pros: Simple and concise.
	* Cons: Generally slower due to multiple operations.
2. Using the spread operator (`...`):
	* Pros: Faster because it involves fewer operations.
	* Cons: Can be less readable for some developers, especially those not familiar with the spread syntax.

**Library Usage**

There is no library used in this benchmark. However, if a test case were to use a library like Lodash or a custom utility function, I would need more information about the specific library and its purpose to explain it.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax used in these test cases. The spread operator (`...`) is a standard feature introduced in ECMAScript 2015 (ES6).

**Alternatives**

If you wanted to benchmark other approaches, here are some alternatives:

1. Using `concat()` instead of the spread operator: This approach would be similar to using `push()`, but with an additional function call.
2. Using a custom implementation of array concatenation: You could write your own implementation of array concatenation, which might be faster or slower depending on its design and optimizations.

Keep in mind that benchmarking is complex and requires careful consideration of factors like platform, hardware, and JavaScript engine variations to ensure accurate results.

Related benchmarks:

Spread VS Push (Single element) (version: 0)

Comparing performance of: 1 vs 2

Created: 6 years ago by: Guest

Jump to the latest result

1

2

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):