Benchmark: Push vs Spread stuff

Tests:

Using the spread operator
[...[1,2],3]
Push
[1,2].push(3)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser/OS: Chrome 71 on Mac OS X 10.14.0

View result in a separate tab

Test name	Executions per second
Using the spread operator	6229060.5 Ops/sec
Push	41709732.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into explaining what's being tested in this benchmark.

**Overview**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net. The test measures the performance difference between two approaches: using the spread operator (`[...arr, newElem]`) and using the `push()` method to add an element to an array (`arr.push(newElem)`).

**Benchmark Definition**

The benchmark definition is represented by a JSON object that contains the code snippet being tested. In this case, there are two test cases:

1. `"Using the spread operator"`: The benchmark definition is `[...[1,2],3]`. This creates a new array using the spread operator, where the inner array `[1,2]` is repeated.
2. `"Push"`: The benchmark definition is `[1,2].push(3)`. This adds a new element `3` to the existing array `[1,2]`.

**Options Compared**

The two options being compared are:

* Using the spread operator (`[...arr, newElem]`)
* Using the `push()` method (`arr.push(newElem)`)

**Pros and Cons of Each Approach:**

* **Spread Operator (`[...arr, newElem]`)**:
	+ Pros:
		- Creates a new array with the desired elements.
		- Does not modify the original array.
		- Can be useful when you need to create a shallow copy of an array.
	+ Cons:
		- Can lead to unnecessary memory allocation and garbage collection.
		- May have performance implications due to the creation of a new array.
* **Push Method (`arr.push(newElem)`)**:
	+ Pros:
		- Modifies the original array in place, which can be more efficient.
		- Does not create a new array or object.
	+ Cons:
		- Changes the original array, which may not be desirable if you need to preserve its integrity.
		- May lead to slower performance due to the modification of the array.

**Other Considerations:**

* **Array Size and Performance**: The size of the array being modified can significantly impact performance. Larger arrays may lead to more memory allocation and garbage collection, which can slow down the push operation.
* **Browser Support**: Some browsers may have varying levels of support for these operations. For example, older browsers might not support the spread operator or `push()` method on arrays.

**Library Usage:**

None of the test cases explicitly use any external libraries or frameworks. However, if we were to analyze the code snippets more closely:

* The spread operator uses the spread syntax (`[...arr, newElem]`), which is a part of the ECMAScript standard and does not require an external library.
* The `push()` method uses the Array.prototype.push() method, which is also a built-in method on the Array prototype.

**Special JS Features or Syntax:**

None of the test cases explicitly use any special JavaScript features or syntax beyond what's described above.

Related benchmarks:

Push vs Spread stuff (version: 0)

Comparing performance of: Using the spread operator vs Push

Created: 5 years ago by: Guest

Jump to the latest result

Using the spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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