Benchmark: ~~ vs Math.floor v2

Script Preparation code:

var a = 123
var b = 321

Tests:

Math.floor
var result = Math.floor(a, b)
~~
var result = ~~(a, b)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.floor
~~

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 and explain what's being tested.

**Benchmark Purpose:**
The main goal of this benchmark is to compare the performance of two JavaScript operators:

1. `~~` (the bitwise NOT operator with unsigned arithmetic)
2. `Math.floor`

These two operators are used to round a number towards zero or negative infinity, respectively.

**Options Compared:**

The benchmark tests two options for rounding numbers in JavaScript:

1. `~` (bitwise NOT operator with unsigned arithmetic): This operator performs a bitwise NOT operation on the input number, which is equivalent to subtracting the number from 0 and then adding 1. The result is an integer value that represents the closest integer less than or equal to the original number.
2. `Math.floor`: This is a built-in JavaScript function that returns the largest integer less than or equal to the given number.

**Pros and Cons:**

* **~ (bitwise NOT operator):**
	+ Pros:
		- Highly optimized and often used in performance-critical codepaths.
		- Simple to implement, as it only requires a single bitwise operation.
	+ Cons:
		- Can lead to unexpected results if the input number is negative or has fractional part.
		- May not work correctly for non-integer inputs (e.g., numbers with decimal points).
* **Math.floor:**
	+ Pros:
		- More intuitive and easier to understand, as it explicitly rounds down to the nearest integer.
		- Works correctly for both positive and negative integers, as well as non-integer inputs.
	+ Cons:
		- May be slower than the bitwise NOT operator due to additional function call overhead.

**Library Used:**
None of the tests use external libraries. The `Math.floor` function is a built-in JavaScript method.

**Special JS Feature/Syntax:**
There are no special JavaScript features or syntaxes used in this benchmark, as both operators are standard part of the language.

**Other Considerations:**

* The benchmark only considers two options for rounding numbers and does not account for other factors that might affect performance, such as:
	+ Input size (e.g., small integers vs. large numbers)
	+ System architecture (e.g., x86 vs. ARM)
	+ Browser or runtime environment specifics
* The benchmark uses a fixed input setup (`var a = 123` and `var b = 321`) to ensure consistent results.

**Alternative Approaches:**
Other approaches for rounding numbers in JavaScript include:

1. Using the `Math.trunc` function (available in some browsers): This function returns the largest integer less than or equal to the given number, similar to `Math.floor`.
2. Implementing custom rounding functions using bitwise operations (e.g., `function roundToNearestInt(x) { return x - Math.ceil(x); }`)
3. Using third-party libraries that provide more advanced rounding algorithms (e.g., decimal.js)

Keep in mind that the performance differences between these approaches may be small and dependent on specific use cases and hardware configurations.

Related benchmarks:

~~ vs Math.floor v2 (version: 0)

Comparing performance of: Math.floor vs ~~

Created: 6 years ago by: Guest

Jump to the latest result

Math.floor

~~

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):