Benchmark: Array append - MeasureThat.net

Script Preparation code:

function arrpush_small() {
    var arr1 = [];
    for (a = 0; a < 100; a++)
    {
        arr1 = [];
        for (i = 0; i < 5000; i++)
        {
            arr1.push('elem' + i);
        }
    }
}

function arrlen_small() {
    var arr2 = [];
    for (b = 0; b < 100; b++)
    {
        arr2 = [];
        for (j = 0; j < 5000; j++)
        {
            arr2[arr2.length] = 'elem' + j;
        }
    }
}


function arrpush_large() {
    var arr1 = [];
    for (i = 0; i < 500000; i++)
    {
        arr1.push('elem' + i);
    }
}

function arrlen_large() {
    var arr2 = [];
    for (j = 0; j < 500000; j++)
    {
        arr2[arr2.length] = 'elem' + j;
    }
}

Tests:

arrpush_small
arrpush_small();
arrlen_small
arrlen_small();
arrpush_large
arrpush_large();
arrlen_large
arrlen_large();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arrpush_small
arrlen_small
arrpush_large
arrlen_large

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is crucial, and MeasureThat.net provides a valuable resource for benchmarking various aspects of the language.

**Benchmark Definition JSON**

The provided Benchmark Definition JSON defines four test cases:

1. `arrpush_small`: Measures the time it takes to append 5000 elements to an array using `arr.push()`.
2. `arrlen_small`: Measures the time it takes to get the length of an array using `arr.length`.
3. `arrpush_large`: Measures the time it takes to append 500000 elements to an array using `arr.push()`. Note that this is a much larger array than in `arrpush_small`, which may not accurately represent real-world scenarios.
4. `arrlen_large`: Measures the time it takes to get the length of an array using `arr.length`.

**Options Compared**

These test cases compare different aspects of JavaScript's array manipulation:

* `push()` vs. manual array assignment (`arr = []`)
* Array size (small vs. large)

**Pros and Cons**

1. **`push()` vs. Manual Assignment**:
	* Pros: `push()` is a built-in method that is more efficient than manual assignment, especially for larger arrays.
	* Cons: When the array is full, pushing elements onto it will cause the array to reallocate memory, which can be slow. In contrast, manual assignment creates a new array, which might be faster (although not always).
2. **Small vs. Large Arrays**:
	* Pros of using small arrays:
		+ Less memory allocation and deallocation overhead
		+ Faster execution times due to reduced dynamic memory allocation
	* Cons of using small arrays:
		+ May not accurately represent real-world scenarios, where array sizes are often larger
3. **Manual Array Length Calculation vs. Built-in `length` Property**:
	* Pros of manual calculation:
		+ Can be useful for educational purposes or when the size of the array needs to be explicitly controlled
	* Cons of manual calculation:
		+ Slower than using the built-in `length` property

**Library and Purpose**

In the provided test cases, no libraries are used. The functions (`arrpush_small`, `arrlen_small`, `arrpush_large`, and `arrlen_large`) use only JavaScript's built-in features.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax mentioned in the Benchmark Definition JSON. However, keep in mind that other benchmarking tests might include features like:

* **`let` vs. `var`**: Comparing the performance of block scope declarations.
* **`const` vs. `let`**: Comparing the performance of constant variables.
* **Arrow functions vs. traditional function expressions**: Comparing the performance of different syntax for creating anonymous functions.

**Other Alternatives**

MeasureThat.net offers a wide range of benchmarking tests, covering various aspects of JavaScript performance, such as:

* DOM manipulation
* JSON parsing and generation
* Networking and async operations
* Machine learning and numerical computations

The website also provides tools for customizing and extending the benchmarks to suit specific use cases.

If you're interested in exploring more benchmarking options or creating your own custom tests, MeasureThat.net is an excellent resource.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Browser/OS: Chrome 70 on Mac OS X 10.14.1

View result in a separate tab

Test name	Executions per second
arrpush_small	91.0 Ops/sec
arrlen_small	2.7 Ops/sec
arrpush_large	7.2 Ops/sec
arrlen_large	2.0 Ops/sec

Related benchmarks:

Array append (version: 0)

Comparing performance of: arrpush_small vs arrlen_small vs arrpush_large vs arrlen_large

Created: 5 years ago by: Guest

Jump to the latest result

arrpush_small

arrlen_small

arrpush_large

arrlen_large

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):