Benchmark: prepend - MeasureThat.net

Script Preparation code:

 var someBigArray = [];
  var anotherArray = [];
  
  for (var i = 0; i < 100; i++) {
    someBigArray.push(10);
    anotherArray.push(10);
  }

Tests:

concat
someBigArray = someBigArray.concat(anotherArray);
push
anotherArray.forEach(function(item) { someBigArray.push(anotherArray); })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
push

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is being tested.

**Benchmark Definition**

The benchmark definition represents a JavaScript microbenchmark. It consists of two parts:

1. **Script Preparation Code**: This code is executed before running the benchmark test. In this case, it creates two large arrays (`someBigArray` and `anotherArray`) by pushing 10 into each array 100 times using a `for` loop.
2. **Html Preparation Code**: This field is empty, which means that no HTML-related setup is required for this benchmark.

The purpose of the script preparation code is to create a large array that will be used as input data for the benchmark test.

**Individual Test Cases**

There are two test cases:

1. **concat**: This test case runs the following JavaScript code:
```javascript
someBigArray = someBigArray.concat(anotherArray);
```
This code concatenates the `anotherArray` into the `someBigArray`. The goal of this benchmark is to measure the performance of the `concat()` method.
2. **push**: This test case runs the following JavaScript code:
```javascript
anotherArray.forEach(function(item) {
  someBigArray.push(anotherArray);
});
```
This code uses a `forEach` loop to iterate over each element in the `anotherArray`. For each iteration, it pushes the entire `anotherArray` onto the end of the `someBigArray`. The goal of this benchmark is to measure the performance of the `push()` method.

**Options Compared**

Both test cases are comparing different approaches for concatenating or pushing data into an array:

* **concat**: Uses the built-in `concat()` method, which creates a new array and copies the elements from one array to another.
* **push**: Uses a loop with `forEach` to push the entire `anotherArray` onto the end of the `someBigArray`.

**Pros and Cons**

Here are some pros and cons of each approach:

* **concat**:
	+ Pros: Efficient, creates a new array that is guaranteed to be in the correct order.
	+ Cons: Creates an additional copy of the data, which can lead to increased memory usage.
* **push**:
	+ Pros: Can use existing arrays, avoids creating an extra copy of data (since `anotherArray` is pushed onto the end of `someBigArray`).
	+ Cons: Less efficient than `concat`, and may not be suitable for all use cases.

**Library**

In this benchmark, no specific library is used beyond the built-in JavaScript methods (`concat()` and `push()`). However, the `forEach` method is a part of the ECMAScript standard, so it's widely supported across most browsers and environments.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The code uses only basic JavaScript constructs like loops, arrays, and methods.

**Alternatives**

If you want to create similar benchmarks for other array operations, here are some alternatives:

* **splice**: Instead of using `concat()` or `push()`, you could test the performance of `splice()` for inserting or removing elements from an array.
* **map() and reduce()**: You could test the performance of these methods for transforming or aggregating arrays.
* **Set**: If you want to test the performance of a data structure that is optimized for fast lookups, you could create a benchmark using JavaScript's `Set` object.

Keep in mind that each benchmark should focus on a specific use case and operation to ensure accurate results.

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Browser/OS: Chrome 54 on Mac OS X 10.11.6

View result in a separate tab

Test name	Executions per second
concat	596.8 Ops/sec
push	38310.3 Ops/sec

Related benchmarks:

prepend (version: 0)

Comparing performance of: concat vs push

Created: 8 years ago by: Guest

Jump to the latest result

concat

push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):