Benchmark: elie_spread_vs_push_test

Tests:

spread
const headers = new Array(10000); const values = new Array(10000); const res = [...headers, ...values];
push
const headers = new Array(10000); const values = new Array(10000); const res = []; res.push(...headers); res.push(...values);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser/OS: Chrome 126 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
spread	21598.0 Ops/sec
push	22560.7 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the JavaScript benchmark being tested on MeasureThat.net.

**Benchmark Definition**

The provided JSON defines two test cases:

1. `elie_spread_vs_push_test`: This benchmark tests the performance difference between using the spread operator (`...`) and the `push` method in JavaScript arrays.
2. The first test case, "spread", uses the spread operator to concatenate two arrays: `headers` and `values`. The resulting array, `res`, is assigned the concatenated values.

The second test case, "push", uses the `push` method to add elements to an empty array (`res`). Then, it uses the spread operator to concatenate the `headers` and `values` arrays and adds them to the `res` array using `push`.

**Options Compared**

Two options are being compared in this benchmark:

1. **Spread Operator (`.slice()` alternative)**
	* In modern JavaScript, the spread operator (`...`) is a concise way to create a new array by spreading the elements of an existing array.
2. **`push` Method**

**Pros and Cons:**

**Spread Operator (`.slice()` alternative)**

Pros:

* More concise and readable code
* Creates a new array without modifying the original array
* Can be more efficient for large arrays since it avoids the overhead of pushing elements to an existing array

Cons:

* May incur additional memory allocation for the new array
* Can be slower than using the `push` method for very large arrays (since JavaScript has to create a new array)

**`push` Method**

Pros:

* Can be faster for very large arrays since it modifies the existing array in-place, avoiding memory allocation
* May reduce garbage collection overhead

Cons:

* Less concise and readable code
* Modifies the original array, which can lead to unexpected behavior if not handled carefully

**Library Usage: None**

This benchmark does not use any external libraries or frameworks. It only relies on built-in JavaScript features.

**Special JS Features/Syntax: None**

There are no special JavaScript features or syntax used in this benchmark (e.g., async/await, generators, etc.).

**Other Alternatives**

If you're interested in exploring alternative approaches for array concatenation, here are a few options:

1. **Array.prototype.concat()**: This method creates a new array by concatenating the elements of two arrays.
2. **Array.prototype.reduce()**: You can use `reduce()` to concatenate an array by accumulating the result in an initial value.
3. **String interpolation**: For small arrays, string interpolation using template literals can be faster and more readable than using the spread operator or `push`.

Keep in mind that these alternatives may have different performance characteristics, readability, or maintainability compared to the original approach used in this benchmark.

I hope this explanation helps!

Related benchmarks:

elie_spread_vs_push_test (version: 0)

Comparing performance of: spread vs push

Created: one year ago by: Registered User

Jump to the latest result

spread

push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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