Benchmark: Floor vs Neg - MeasureThat.net

Tests:

Floor
var x = Math.floor(3.23)
Neg
var x = ~~3.23

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Floor
Neg

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The benchmark measures the performance difference between two approaches to round numbers in JavaScript:

1. `Math.floor()` (Floor function)
2. The bitwise NOT operator (`~`) followed by integer division (`/`), which effectively performs rounding down (`~~n == -(-n)`).

**Options compared:**

* Floor function (`Math.floor()`)
* Bitwise NOT operator (`~`) with integer division (`/`)

**Pros and Cons of each approach:**

1. **Floor function (`Math.floor()`):**
	* Pros:
		+ More readable and intuitive
		+ Less prone to errors due to its clear purpose
	* Cons:
		+ May be slower due to the overhead of a mathematical operation
2. **Bitwise NOT operator (`~`) with integer division (`/`):**
	* Pros:
		+ Generally faster than `Math.floor()` due to its bitwise nature
	* Cons:
		+ Less readable and less intuitive, which can lead to errors or bugs

**Library usage:**

There is no explicit library mentioned in the benchmark JSON. However, it's worth noting that some JavaScript engines may have additional optimizations or implementations of these rounding functions.

**Special JS feature or syntax:**

None are explicitly mentioned in this benchmark.

**Other alternatives:**

In general, other approaches to round numbers include:

* `Math.round()`
* `Number.prototype.floor()` (not applicable here, as this is a built-in function)
* Compiler optimizations specific to the JavaScript engine being used

For this particular benchmark, using the bitwise NOT operator (`~`) with integer division (`/`) is an unconventional but efficient way to round down numbers.

To reproduce this benchmark, you can use the provided JSON structure and prepare a test case with the same script preparation code as in the example:
```javascript
var x = ~~3.23;
```
You can also modify the `Benchmark Definition` field in the individual test cases to include your own rounding function or approach.

Keep in mind that the performance differences between these approaches may vary depending on the specific JavaScript engine, browser, and hardware being used.

Related benchmarks:

Floor vs Neg (version: 0)

Comparing performance of: Floor vs Neg

Created: 5 years ago by: Guest

Jump to the latest result

Floor

Neg

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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