Benchmark: undefined to boolean

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Tests:

Double negation
console.log(!!undefined);
Boolean function
console.log(Boolean(undefined));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Double negation
Boolean function

Fastest: N/A

Slowest: N/A

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/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Double negation	55607.0 Ops/sec
Boolean function	55782.1 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark provided focuses on the conversion of `undefined` values into boolean values in JavaScript. It compares two distinct approaches to achieve this:

1. **Double Negation**: This method uses the expression `!!undefined`. The double negation (`!!`) works by first converting the value to a boolean using the bitwise NOT operator (`~`) twice. The first negation converts the value to a boolean representation of its truthiness, while the second negation restores the actual boolean value.

2. **Boolean Function**: This method invokes the `Boolean` constructor function with `undefined` as an argument: `Boolean(undefined)`. The `Boolean` function returns either `true` or `false`, depending on the truthiness of the provided value. In this case, it will explicitly convert `undefined` into `false`.

### Comparison of Options

**Double Negation (!!undefined)**:
- **Pros**: 
  - It is a concise way to perform the conversion.
  - Often seen as idiomatic JavaScript; many developers are familiar with this pattern.
  - Potentially performs slightly faster, as it avoids a function call.
- **Cons**: 
  - Might be less readable to novice developers who are unfamiliar with the double negation pattern.

**Boolean Function (Boolean(undefined))**:
- **Pros**: 
  - Clear and explicit in its intent, making the code more readable and understandable.
  - More approachable for developers who may not be familiar with JavaScript idioms like double negation.
- **Cons**: 
  - Involves a function call, which may introduce a slight overhead compared to the double negation approach.
  - Some developers might perceive it as a less elegant solution in contexts where brevity is favored.

### Performance Considerations

The benchmark results show that both methods have similar performance, with the `Boolean` function slightly outperforming the double negation in this test environment. This indicates that the performance difference might not be substantial enough to influence which method to use definitively. Instead, the choice could be based more on code readability and maintainability.

### Other Alternatives

Other approaches to convert `undefined` to a boolean value could include:

- **Conditional (Ternary) Operator**: Using `undefined ? true : false`, which provides another explicit way to convert the value. While this method is more verbose, it remains clear.
- **Logical OR**: Using `undefined || false`, which replaces `undefined` with `false`, although this approach might lead to subtle bugs if one expects the original value to be preserved.

In conclusion, the choice between using double negation and the `Boolean` function may come down to personal or team preferences regarding readability versus brevity, as performance differences are typically minimal. Each approach can be valid depending on the context and audience of the code.

Related benchmarks:

undefined to boolean (version: 1)

Comparing performance of: Double negation vs Boolean function

Created: one year ago by: Guest

Jump to the latest result

Double negation

Boolean function

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):