Benchmark: Powers of two - MeasureThat.net

Tests:

Outside
var x = 10; var p = x/10.2;
Inside
var x = 10; var p = x*0.098;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Outside
Inside

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 data to understand what's being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The provided benchmark definition is quite simple. It compares two approaches: calculating `p` outside the loop and inside the loop. The script preparation code and HTML preparation code are both empty, indicating that the focus is solely on the JavaScript code.

```json
{
    "Name": "Powers of two",
    "Description": "If they should be written in an array or in the loop as we go",
    "Script Preparation Code": null,
    "Html Preparation Code": null
}
```

**Options Compared**

The benchmark compares two options:

1. **Outside**: Calculating `p` outside the loop using a variable assignment (`var p = x/10.2;`)
2. **Inside**: Calculating `p` inside the loop, likely using an expression evaluation (e.g., `x*0.098`)

**Pros and Cons**

**Outside**

Pros:

* Easier to read and maintain, as the calculation is decoupled from the loop.
* May be optimized by the JavaScript engine for better performance.

Cons:

* Requires additional memory allocation for the variable `p`.
* May lead to slower initial execution due to the variable initialization.

**Inside**

Pros:

* Eliminates the need for additional memory allocation, as the calculation is performed directly in the loop.
* Can potentially take advantage of more efficient expression evaluation optimizations by the JavaScript engine.

Cons:

* More difficult to read and maintain, as the calculation is tightly coupled with the loop.
* May be slower due to the overhead of evaluating expressions within the loop.

**Other Considerations**

When deciding between these two approaches, consider the trade-off between memory usage and performance. If you prioritize readability and can afford the slight performance penalty, using `var p = x/10.2;` outside the loop might be a better choice. However, if memory is a concern or you need to squeeze every last bit of performance out of your code, calculating `p` inside the loop may be the way to go.

**Library and Special JS Features**

In this benchmark, no specific JavaScript library is used. The tests only rely on standard JavaScript features.

**Test Cases with Special JS Features (None)**

There are no special JavaScript features or syntax mentioned in the provided test cases.

Now, let's discuss alternatives:

Other approaches to calculating `p` could include:

* Using a single expression that combines the division and multiplication operations.
* Employing a different data structure, such as an array or object, to store intermediate results.
* Utilizing native JavaScript functions like `Math.pow()` or bitwise operations for exponentiation.

However, these alternatives are not tested in this benchmark.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; rv:53.0) Gecko/20100101 Firefox/53.0

Browser/OS: Firefox 53 on Windows 7

View result in a separate tab

Test name	Executions per second
Outside	992084864.0 Ops/sec
Inside	983719168.0 Ops/sec

Related benchmarks:

Powers of two (version: 0)

If they should be written in an array or in the loop as we go

Comparing performance of: Outside vs Inside

Created: 7 years ago by: Guest

Jump to the latest result

Outside

Inside

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):