Benchmark: To int conversion

Script Preparation code:

var input = 5.5;

Tests:

floor
Math.floor(input);
bit or 0
input | 0;
bit not
~~input
parseInt
parseInt(input);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
floor
bit or 0
bit not
parseInt

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser/OS: Chrome 91 on Windows 7

View result in a separate tab

Test name	Executions per second
floor	2268936.2 Ops/sec
bit or 0	5889351.5 Ops/sec
bit not	5933020.5 Ops/sec
parseInt	2230798.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its various components.

**Benchmark Definition JSON**

The provided benchmark definition is a simple JSON object that contains four essential pieces of information:

1. **Name**: The name of the benchmark, which in this case is "To int conversion".
2. **Description**: An empty description, which suggests that this benchmark is primarily focused on measuring the performance of different integer conversion methods.
3. **Script Preparation Code**: A JavaScript code snippet that initializes a variable `input` with the value 5.5.
4. **Html Preparation Code**: An empty string, indicating that no additional HTML preparation code is required.

**Individual Test Cases**

The benchmark consists of four individual test cases, each defined in a separate JSON object:

1. **floor**
	* Benchmark Definition: `Math.floor(input);`
2. **bit or 0**
	* Benchmark Definition: `input | 0;` (a bitwise OR operation with 0)
3. **bit not**
	* Benchmark Definition: `~~input` (a bitwise NOT operation)
4. **parseInt**
	* Benchmark Definition: `parseInt(input);`

**Library and Special JS Features**

In this benchmark, the following libraries are used:

1. None explicitly mentioned, but it's assumed that the standard JavaScript library is being used.

Special JavaScript features used in these benchmarks include:

1. Bitwise operations (`|`, `~`): These operations are used to perform integer conversions.
2. `Math.floor()`: A built-in JavaScript function for rounding down a number to the nearest integer.
3. `parseInt()`: A built-in JavaScript function for parsing an integer from a string.

**Options Compared**

In this benchmark, four different options are being compared:

1. **Bitwise OR with 0**: This method uses a bitwise operation to convert the floating-point number to an integer.
2. **Bitwise NOT**: This method uses a bitwise operation to convert the floating-point number to an integer by essentially "flipping" the bits and then rounding down.
3. **Math.floor()**: This method uses a built-in JavaScript function for rounding down a number to the nearest integer.
4. **parseInt()**: This method uses a built-in JavaScript function for parsing an integer from a string.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Bitwise OR with 0**:
	* Pros: Simple, fast, and efficient.
	* Cons: May lose precision due to rounding issues.
2. **Bitwise NOT**:
	* Pros: Fast and efficient, but may have implementation-dependent precision issues.
	* Cons: Less readable than other approaches.
3. **Math.floor()**:
	* Pros: Readable, reliable, and widely supported.
	* Cons: May be slower due to function call overhead.
4. **parseInt()**:
	* Pros: Fast and efficient, but requires string parsing which can be slow for large inputs.
	* Cons: Less readable than other approaches.

**Other Alternatives**

Some alternative integer conversion methods that could be tested in this benchmark include:

1. **Integer division**: Using the `/` operator with a cast to `number`.
2. **Fuzz arithmetic**: Using approximations like `round(input)` or `floor(input + 0.5)`.
3. **Approximation using NaN**: Using `isNaN(input)` and then performing an integer conversion.
4. **Using a specialized library**: Such as `number.js` for fast integer conversions.

These alternatives could provide interesting variations on the benchmark results, but may also introduce additional complexity or biases.

Related benchmarks:

To int conversion (version: 0)

Comparing performance of: floor vs bit or 0 vs bit not vs parseInt

Created: 8 years ago by: Registered User

Jump to the latest result

floor

bit or 0

bit not

parseInt

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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