Benchmark: boolean conversion

Script Preparation code:

function foo() {
}

Tests:

Implicit conversion
if (foo) { }
Explicit conversion
if (typeof foo === 'function') { }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Implicit conversion
Explicit conversion

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Implicit conversion	213313456.0 Ops/sec
Explicit conversion	211511808.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark definition is provided in JSON format, which includes:

* `Name`: The name of the benchmark, "boolean conversion".
* `Description`: An empty description, suggesting that this is a basic test.
* `Script Preparation Code`:
```javascript
function foo() {
  // code to be tested
}
```
This script definition is used as the input for the implicit and explicit boolean conversion tests.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **Implicit Conversion**:
```javascript
if (foo) {
  // code to be executed if foo is truthy
}
```
In this test, the JavaScript interpreter implicitly converts the `foo` function call to a boolean value using the "truthiness" rule. This means that the expression will evaluate to true if the function returns any value other than `undefined`, `null`, 0, or the empty string (`""`). If the function returns one of these values, the expression will be false.

Pros:

* Simple and efficient
* Fast execution

Cons:

* May lead to unexpected behavior in certain cases (e.g., when comparing functions with different return types)

2. **Explicit Conversion**:
```javascript
if (typeof foo === 'function') {
  // code to be executed if foo is a function
}
```
In this test, the JavaScript interpreter explicitly checks the type of `foo` using the `typeof` operator. This ensures that only functions are evaluated as truthy.

Pros:

* More predictable and robust behavior
* Avoids potential pitfalls with implicit conversion

Cons:

* May be slower due to the explicit type check

**Library Usage**

There is no explicit mention of a library in the provided code snippets. However, it's worth noting that many JavaScript engines use libraries or frameworks to implement the language features. For example, the `typeof` operator might rely on the V8 engine's built-in type checking capabilities.

**Special JS Feature/Syntax**

This benchmark does not explicitly test any special JavaScript feature or syntax. The tests focus on the implicit and explicit boolean conversion rules.

**Alternatives**

Other approaches to evaluating booleans in JavaScript include:

* **Using a conditional operator**: Instead of `if` statements, you could use a conditional operator (`?:`) to evaluate the expression directly: `foo() ? true : false`.
* **Implementing a custom boolean function**: You could write a custom function that implements the implicit and explicit conversion rules, allowing for more control over the evaluation process.
* **Using a testing framework with built-in assertion mechanisms**: Some testing frameworks, like Jest or Mocha, provide built-in assertions for testing boolean values.

Related benchmarks:

boolean conversion (version: 0)

Comparing performance of: Implicit conversion vs Explicit conversion

Created: 7 years ago by: Guest

Jump to the latest result

Implicit conversion

Explicit conversion

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):