Benchmark: Push vs. Spread - MeasureThat.net

Tests:

Push
var arr = []; for (var i = 0; i < 5; i++) arr.push(i);
Spread
var arr = []; arr.push(...[0,1,2,3,4]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Push
Spread

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what's being tested in the "Push vs. Spread" benchmark.

**Benchmark Definition**

The benchmark is defined by two test cases: "Push" and "Spread". The goal of this benchmark is to compare the performance of pushing elements onto an array versus using the spread operator (`...`) to create a new array with the same elements.

**Options Compared**

There are two approaches being compared:

1. **`push()`**: This method appends one or more values to the end of an array.
2. **Spread Operator (`...`)**: This syntax creates a new array by duplicating the elements from an existing array or iterable.

**Pros and Cons of Each Approach**

* `push()`: Pros:
	+ More readable code (less concise)
	+ Can be more efficient for small arrays
* Spread Operator (`...`): Pros:
	+ More concise code
	+ Creates a new array, avoiding potential issues with modifying the original array
* Spread Operator (`...`): Cons:
	+ May incur overhead due to creating a new array

**Library and Purpose**

There is no explicit library mentioned in the benchmark definition. However, it's likely that this benchmark is testing native JavaScript functionality.

**Special JS Feature or Syntax**

The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) as part of the language specification. It allows you to create new arrays by duplicating elements from an existing array or iterable.

**Benchmark Preparation Code and Test Cases**

The test cases are simple JavaScript code snippets that prepare an empty array `arr` and perform the specific operation being tested:

* "Push": `for (var i = 0; i < 5; i++) arr.push(i);`
* "Spread": `arr.push(...[0,1,2,3,4]);`

The test cases are identical except for the implementation details. This allows the benchmark to focus on measuring the execution time of the push operation versus using the spread operator.

**Other Alternatives**

If you're interested in testing alternative approaches, here are a few examples:

* Using `concat()`: Instead of `push()` or the spread operator, this approach would concatenate arrays using the `concat()` method.
* Using a loop with array indexing: This approach would use an explicit loop to iterate over the elements and append them to the array.
* Using a library like Lodash: This approach would use the `lodash.push` function from the Lodash library, which might provide additional optimizations or features.

Keep in mind that these alternatives may not be as straightforward or readable as using the `push()` method or the spread operator.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0

Browser/OS: Firefox 88 on Windows

View result in a separate tab

Test name	Executions per second
Push	35423668.0 Ops/sec
Spread	5062572.0 Ops/sec

Related benchmarks:

Push vs. Spread (version: 0)

Comparing performance of: Push vs Spread

Created: 6 years ago by: Guest

Jump to the latest result

Push

Spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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