Benchmark: test spreadpush on2

Tests:

push
const messageSubscription = [{id: 1}, {id: 2} , {id: 3}, {id: 4}, {id: 5}, {id: 6}, {id: 7}, {id: 8}] const messageSubscriptions = messageSubscription.reduce((previous, messageSubscription) => { previous.push(messageSubscription.id) return previous }, [])
spread
const messageSubscription = [{id: 1}, {id: 2} , {id: 3}, {id: 4}, {id: 5}, {id: 6}, {id: 7}, {id: 8}] const messageSubscriptions = messageSubscription.reduce((previous, messageSubscription) => { return [...previous, messageSubscription.id] }, [])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
push
spread

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark measures the performance difference between two approaches to push elements onto an array: using the `push()` method and using the spread operator (`...`).

**Benchmark Definition JSON**

The benchmark definition is a simple script that creates an array of objects with `id` properties, reduces it to an array of `id` values, and then uses these arrays in the two different approaches.

**Approaches Compared**

There are two approaches compared:

1. **Push Method**: This approach uses the `push()` method to add elements to the `messageSubscriptions` array.
```javascript
previous.push(messageSubscription.id)
```
2. **Spread Operator**: This approach uses the spread operator (`...`) to create a new array with the `id` values.
```javascript
return [...previous, messageSubscription.id]
```
**Pros and Cons**

* **Push Method**:
	+ Pros: Can be more efficient for small arrays, as it doesn't require creating a new array.
	+ Cons: Requires updating the internal array's length when an element is added, which can lead to performance issues with large arrays.
* **Spread Operator**:
	+ Pros: Creates a new array without modifying the original array, making it more predictable and efficient for large arrays.
	+ Cons: Requires creating a new array, which can be less efficient than the `push()` method for small arrays.

**Other Considerations**

* Both approaches have their own set of edge cases, such as handling null or undefined values. The benchmark does not account for these edge cases.
* The spread operator is a relatively recent addition to JavaScript and may not be supported in older browsers or environments.

**Library Usage**

There are no external libraries used in this benchmark.

**Special JS Features/Syntax**

This benchmark uses the spread operator (`...`), which was introduced in ECMAScript 2015 (ES6). If you're using an older version of JavaScript, this feature might not be available.

**Alternative Approaches**

Other alternatives to push elements onto an array include:

1. `unshift()`: Adds elements to the beginning of the array.
2. Using a `for` loop or `forEach()` method: These approaches can be less efficient than the `push()` and spread operator methods, but might be useful for specific use cases.

In summary, this benchmark provides a simple yet informative comparison between two common approaches to pushing elements onto an array in JavaScript. By understanding the pros and cons of each approach, developers can make more informed decisions when optimizing their code for performance.

Related benchmarks:

test spreadpush on2 (version: 0)

Comparing performance of: push vs spread

Created: 2 years ago by: Guest

Jump to the latest result

push

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):