Benchmark: Math.floor - MeasureThat.net

Script Preparation code:

var x = 100.349594928
var floor = Math.floor

Tests:

Math.floor
Math.floor(x)
floor
floor(x)
not not
~~x
shift
x >> 0
or
x | 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math.floor
floor
not not
shift
or

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Overview**

The provided JSON represents a JavaScript microbenchmark, where different functions are tested to determine which one executes faster. The test cases include `Math.floor`, `floor` (which is not part of the ECMAScript standard but is used by some JavaScript engines), and three other expressions: `~~x` (bitwise NOT, followed by a bitwise AND with 0), `x >> 0` (right shift by 0), and `x | 0` (bitwise OR with 0).

**Options Compared**

The benchmark compares the execution times of two JavaScript functions:

1. **`Math.floor`**: A built-in JavaScript function that returns the largest integer less than or equal to a given number.
2. **`floor`**: A custom function used by some JavaScript engines, which is not part of the ECMAScript standard.

**Pros and Cons**

*   `Math.floor`: This is a well-established, widely supported, and optimized function in most JavaScript engines. It's likely to be the fastest option due to its implementation.
*   `floor`: Although it's used by some JavaScript engines, this custom function might not be as efficient or optimized as `Math.floor`. Its performance may vary depending on the specific engine.

**Other Considerations**

*   **Browser Support**: The benchmark uses Yandex Browser 23 and Chrome/108.0.0.0 (which is an older version of Chrome). Different browsers may have varying levels of support for these functions, affecting their execution times.
*   **Device Platform and Operating System**: The results are from a Mac OS X 10.15.7 device platform, which might impact the performance due to hardware or software-specific factors.

**Library and Syntax**

None of the provided benchmark expressions use any external libraries. However, some JavaScript engines may optimize certain functions using techniques like just-in-time (JIT) compilation or caching.

*   **`~~x`**: This expression uses a bitwise NOT (`~`) followed by a bitwise AND with 0. While not directly related to any specific library, it's an interesting example of bitwise operations in JavaScript.
*   **`>>` and `|` operators**: These expressions use the right shift (`>>`) and bitwise OR (`|`) operators, respectively. These operators are part of the ECMAScript standard and have different behaviors depending on their position within a statement.

**Alternatives**

If you want to create your own JavaScript microbenchmark or compare other functions, consider the following alternatives:

1.  **Benchmarking libraries**: Tools like Benchmark.js or jsperf allow you to write benchmark tests in JavaScript and compare the performance of various implementations.
2.  **ECMAScript standards**: Familiarize yourself with the ECMAScript standard, which defines the behavior of various JavaScript functions, including those mentioned in this benchmark.

By considering these options and understanding the pros and cons of different approaches, you can create more accurate benchmarks to evaluate the performance of various JavaScript functions or algorithms.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 YaBrowser/23.1.2.980 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 23 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Math.floor	8019704.5 Ops/sec
floor	12426390.0 Ops/sec
not not	24462026.0 Ops/sec
shift	24388250.0 Ops/sec
or	24385856.0 Ops/sec

Related benchmarks:

Math.floor (version: 1)

Comparing performance of: Math.floor vs floor vs not not vs shift vs or

Created: 3 years ago by: Registered User

Jump to the latest result

Math.floor

floor

not not

shift

or

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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