Benchmark: test spread - MeasureThat.net

Tests:

test forEach
var array1 = []; [[1, 2, 3], [4, 5, 6], [7, 8, 9]].forEach(el => { el.forEach(e => { array1.push(e); }); });
test spread
var array1 = []; [[1, 2, 3], [4, 5, 6], [7, 8, 9]].forEach(el => { array1.push(...el); });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test forEach
test spread

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and analyzed.

**Benchmark Definition**

The benchmark definition is an empty JSON object with no specific script preparation code or HTML preparation code. This suggests that the benchmark is designed to test JavaScript engine behavior without any external dependencies or setup.

**Individual Test Cases**

There are two individual test cases:

1. **test forEach**: This test case uses the `forEach` method to iterate over an array of arrays, pushing elements from each inner array into a separate array (`array1`). The benchmark definition is:
```javascript
var array1 = [];
[[1, 2, 3], [4, 5, 6], [7, 8, 9]].forEach(el => {
    el.forEach(e => {
        array1.push(e);
    });
});
```
This test case likely tests the JavaScript engine's performance and optimizations for iterating over arrays with multiple levels of nesting.

2. **test spread**: This test case uses the `spread` operator to expand an array of arrays into a single array, pushing elements from each inner array into a separate array (`array1`). The benchmark definition is:
```javascript
var array1 = [];
[[1, 2, 3], [4, 5, 6], [7, 8, 9]].forEach(el => {
    array1.push(...el);
});
```
This test case likely tests the JavaScript engine's performance and optimizations for using the spread operator to manipulate arrays.

**Options Compared**

The two test cases compare the performance of two different approaches:

* **test forEach**: Iterates over an array using `forEach`, with inner iterations on each element.
* **test spread**: Uses the `spread` operator to expand an array of arrays into a single array, without inner iterations.

These options demonstrate different ways of iterating over and manipulating arrays in JavaScript.

**Pros and Cons**

Here are some pros and cons of each approach:

* **test forEach**:
	+ Pros: Can be used for more complex iteration scenarios.
	+ Cons: May incur additional overhead due to the extra iteration.
* **test spread**:
	+ Pros: Typically faster and more efficient, as it avoids unnecessary iterations.
	+ Cons: May not be suitable for all iteration use cases.

**Library/ Framework Considerations**

Neither of these test cases uses any specific library or framework. However, if a similar benchmark were to use a library like Lodash, the implementation might look different.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in these test cases. The `forEach` method and the spread operator are standard JavaScript features.

**Other Alternatives**

If you wanted to create an alternative benchmark for testing array manipulation performance, some possible approaches could include:

* Using a larger array with more elements
* Comparing different sorting algorithms (e.g., `sort()`, `mergeSort()`)
* Testing the performance of various data structures (e.g., linked lists, stacks)
* Measuring the performance of different methods for manipulating arrays in memory (e.g., push vs. unshift)

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36

Browser/OS: Chrome 64 on Mac OS X 10.13.3

View result in a separate tab

Test name	Executions per second
test forEach	15800948.0 Ops/sec
test spread	11030084.0 Ops/sec

Related benchmarks:

test spread (version: 0)

Comparing performance of: test forEach vs test spread

Created: 6 years ago by: Guest

Jump to the latest result

test forEach

test spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):