Benchmark: boolean not to number

Script Preparation code:

var test = 1;

Tests:

approach 1
const test2 = +!test;
approach 2
const test2 = (test + 1) % 2;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
approach 1
approach 2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Test name	Executions per second
approach 1	16826336.0 Ops/sec
approach 2	16924552.0 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 considered.

**Benchmark Overview**

The benchmark is designed to measure the performance of JavaScript code that attempts to convert a boolean value to a number using different approaches.

**Benchmark Definition JSON**

The benchmark definition provides some basic information:

* `Name`: A descriptive name for the benchmark.
* `Description`: None (empty).
* `Script Preparation Code`: A script that sets up the test environment. In this case, it simply assigns the value 1 to a variable named `test`.
* `Html Preparation Code`: None (empty).

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Approach 1**: The first test case attempts to convert the boolean value `!test` to a number using the unary plus operator (`+`). This approach is often used in JavaScript.
2. **Approach 2**: The second test case uses a mathematical expression `(test + 1) % 2` to achieve the same result.

**Library and Purpose**

There is no explicit library mentioned in the benchmark definition. However, some libraries like `lodash` or `mathjs` might be used indirectly by relying on their built-in functions or utilities.

**Special JS Feature/Syntax**

Neither of the test cases relies on any special JavaScript features or syntax.

**Comparison**

The two approaches are compared to determine which one is faster:

* **Approach 1**: Uses a unary plus operator (`+`) to convert `!test` to a number.
* **Approach 2**: Uses a mathematical expression `(test + 1) % 2` to achieve the same result.

**Pros and Cons**

Here's a brief summary of each approach:

* **Approach 1 (Unary Plus Operator)**:
	+ Pros: Simple, widely supported.
	+ Cons: Can be slower due to type coercion, which can lead to performance issues in some cases.
* **Approach 2 (Mathematical Expression)**:
	+ Pros: May be faster, as it avoids type coercion.
	+ Cons: Less straightforward, requires a mathematical expression that might not be immediately obvious.

**Other Considerations**

In addition to the approaches themselves, other factors might affect the benchmark's results:

* **Type Coercion**: JavaScript's type coercion rules can lead to performance issues when converting booleans to numbers. Approach 1 uses this coercion, while Approach 2 avoids it.
* **Browser Support**: Both approaches are supported by most modern browsers, but some older versions or specific browser configurations might exhibit variations in performance.

**Alternatives**

Other ways to achieve the same result could be:

* Using a different library function (e.g., `Number(!test)`)
* Employing a different mathematical operation (e.g., using bitwise operations)
* Utilizing a preprocessor or code transformation tool to optimize the code

Related benchmarks:

boolean not to number (version: 0)

Comparing performance of: approach 1 vs approach 2

Created: 2 years ago by: Guest

Jump to the latest result

approach 1

approach 2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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