Benchmark: js boolean double negative isSet

Tests:

!!
let a = !!null; let b = !!{};
Boolean
let a = Boolean(null); let b = Boolean({});
isSet
let a = (null === null || null === undefined || isNaN(null)); let b = ({} === null || {} === undefined || isNaN({}));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!!
Boolean
isSet

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
!!	199480624.0 Ops/sec
Boolean	165555248.0 Ops/sec
isSet	21908934.0 Ops/sec

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

LLMs can make mistakes. Check important info.

The provided benchmark tests various methods of evaluating the truthiness of values pertaining to `null` and an empty object in JavaScript. The specific approaches compared are:

1. **Double Negation (`!!`)**:
   - **Test Case**: 
     ```javascript
     let a = !!null;     // This will result in false
     let b = !!{};       // This will result in true
     ```
   - **Pros**: 
     - The double negation is a very common idiom in JavaScript for converting values to their boolean equivalent. It is concise and efficient.
   - **Cons**: 
     - None particularly, but readability may be impacted for those unfamiliar with the idiom.
   
2. **Boolean Constructor**:
   - **Test Case**:
     ```javascript
     let a = Boolean(null); // This will result in false
     let b = Boolean({});    // This will result in true
     ```
   - **Pros**:
     - Using the `Boolean` constructor explicitly expresses the intention to convert a value to a boolean, which can be clearer to some developers.
   - **Cons**:
     - It is generally a bit slower than the double negation due to the additional overhead of function calls and may not be as concise.

3. **Explicit Comparison and Logical Operations**:
   - **Test Case**:
     ```javascript
     let a = (null === null || null === undefined || isNaN(null)); // Evaluates to true since null === null is true
     let b = ({} === null || {} === undefined || isNaN({})); // Evaluates to false
     ```
   - **Pros**:
     - This method explicitly checks for types and conditions, which can potentially cater to more complex scenarios.
   - **Cons**:
     - This approach is significantly more verbose and complex. From a performance perspective, it is also the slowest among the options tested, as it involves multiple equality checks and a function call (`isNaN`).

### Benchmark Results and Considerations

The benchmark results show the number of executions per second for each test:

- The double negation (`!!`) achieves the highest performance with **199,480,624.0 executions per second**.
- The `Boolean` constructor comes next with **165,555,248.0 executions per second**.
- The explicit comparison method (`isSet`) performs the worst at **21,908,934.0 executions per second**.

### Other Considerations

- **Performance**: When choosing between these methods, if performance is a critical factor (e.g., in tight loops), the double negation operator is the clear winner.
- **Readability**: Depending on the audience, the explicit `Boolean` constructor might be preferred for better code clarity.
- **Complex Logic**: The explicit comparisons might be warranted in situations where you need to check for multiple conditions or when clarity involving NaN or undefined values is crucial.

### Alternatives

- Using other utility libraries (like Lodash's `_.isNil`) could provide even more robust type-checking methods, though these come with their own performance implications due to additional function calls and require loading the library itself.
- If you want to handle more complex assertions, writing custom utility functions may help, especially when clarity or specific edge cases are required.
- In situations where performance and readability conflict, careful consideration is needed to balance these factors based on the specific requirements and context of the code.

Related benchmarks:

js boolean double negative isSet (version: 1)

Comparing performance of: !! vs Boolean vs isSet

Created: one year ago by: Guest

Jump to the latest result

!!

Boolean

isSet

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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