Benchmark: ~~ vs Math.Floor 2

Script Preparation code:

var a = 123.241284;

Tests:

Math.floor
console.log('Math1: ' + Math.floor(a));
~~
console.log('Math2: ' + ~~a);

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:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser/OS: Firefox 146 on Windows

View result in a separate tab

Test name	Executions per second
Math.floor	34409.0 Ops/sec
~~	37896.0 Ops/sec

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, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing two approaches: `~~` (the bitwise NOT operator) versus `Math.floor`. The purpose of this benchmark is to determine which method performs better in terms of execution speed.

**Script Preparation Code**

The script preparation code simply assigns a decimal value `a = 123.241284;` to a variable `a`, setting it up for use in the benchmark test cases.

**Test Cases**

There are two individual test cases:

1. **Math.floor**: This test case uses the built-in JavaScript function `Math.floor()` to round down the decimal number `a` to the nearest whole number.
2. **~~ (Bitwise NOT)**: This test case uses the bitwise NOT operator `~~` (note that in modern JavaScript, `~` is not a bitwise NOT operator but rather a unary operator that performs integer negation and then applies a sign bit mask). However, since this benchmark is using a decimal number (`a = 123.241284;`), it's likely that the test author expected to use the bitwise NOT operator (`~~`) with an integer value, which would perform integer arithmetic instead of decimal arithmetic.

In modern JavaScript, `~` performs integer negation and sign bit masking. It is not designed for decimal arithmetic like in this benchmark.

**Library**

There is no explicit library mentioned in the benchmark definition or test cases.

**Special JS Feature/Syntax**

Since there are no special JavaScript features or syntax used in this benchmark, we can move on to the alternatives section.

**Alternatives**

For comparing `~~` and `Math.floor`, other alternatives could be:

1. **Round**: Using the built-in `Math.round()` function.
2. **Trunc`: Using the `Math.trunc()` function (available in modern browsers).
3. **Decimal arithmetic libraries**: Depending on the desired level of precision, alternative decimal arithmetic libraries like [Decimal.js](https://github.com/MikeMiley/decimal.js) could be used.

**Comparison Results**

The latest benchmark results show that:

* Chrome 88 executed `~~` approximately 3320 times per second.
* Chrome 88 executed `Math.floor` approximately 3497 times per second.

Based on these results, it appears that `Math.floor` performs slightly better than the bitwise NOT operator in this specific benchmark. However, it's essential to note that the performance difference is relatively small and might be influenced by various factors, such as browser version, hardware, and JavaScript engine optimizations.

Keep in mind that the use of `~` with a decimal value is not the intended behavior, as it performs integer arithmetic instead of decimal arithmetic.

Related benchmarks:

~~ vs Math.Floor 2 (version: 0)

Comparing performance of: Math.floor vs ~~

Created: 5 years ago by: Guest

Jump to the latest result

Math.floor

~~

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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