Benchmark: Boolean constructor vs double negotiation trick in javascript(test)

Script Preparation code:

var bNull = null;
var bTrue = true;
var bFalse = false;

Tests:

Boolean
Boolean(bNull) Boolean(bTrue) Boolean(bFalse)
Double negation trick
!!bNull !!bTrue !!bFalse

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Boolean
Double negation trick

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's break down the benchmark and its results.

**Benchmark Overview**

The benchmark tests two different approaches to convert a boolean value in JavaScript:

1. **Boolean constructor**: Using the `Boolean()` function to explicitly convert a value to a boolean type.
2. **Double negation trick**: Using the expression `!!` (two exclamation marks) to implicitly convert a value to a boolean type.

**Test Cases**

There are two test cases:

### Test Case 1: Boolean Constructor

This test case uses the `Boolean()` function to convert three values to boolean types:

* `bNull = null`: The null value will be converted to `false`.
* `bTrue = true`: The boolean value `true` remains unchanged.
* `bFalse = false`: The boolean value `false` remains unchanged.

The benchmark measures the execution time for converting these values using the `Boolean()` function.

### Test Case 2: Double Negation Trick

This test case uses the double negation trick (`!!`) to implicitly convert three values to boolean types:

* `bNull = null`: The null value will be converted to `false`.
* `bTrue = true`: The boolean value `true` remains unchanged.
* `bFalse = false`: The boolean value `false` remains unchanged.

The benchmark measures the execution time for converting these values using the double negation trick.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Boolean constructor**:
	+ Pros: Explicit conversion, easy to read and understand.
	+ Cons: May be slower than the double negation trick due to the overhead of the `Boolean()` function call.
* **Double negation trick**:
	+ Pros: Implicit conversion, can be faster than the Boolean constructor due to the simplicity of the expression.
	+ Cons: Less readable and less intuitive than the Boolean constructor.

**Other Considerations**

When deciding which approach to use, consider the following factors:

* **Performance**: If performance is critical, the double negation trick might be a better choice. However, if readability and maintainability are more important, the Boolean constructor might be a better option.
* **Code style**: Some developers prefer explicit conversions using the `Boolean()` function, while others use the double negation trick for implicit conversions.

**Library**

No library is used in this benchmark.

**Special JS Feature or Syntax**

The double negation trick (`!!`) is a special JavaScript feature that uses two exclamation marks to perform an explicit boolean conversion. This syntax is not commonly used in modern JavaScript code, but it's still supported for backward compatibility.

**Alternatives**

If you need to convert a value to a boolean type, consider using the following alternatives:

* `Boolean()` function: A more explicit and readable approach.
* `!!` expression (double negation trick): A faster, but less readable approach.
* Conditional expressions (`x ? true : false`) or ternary operators (`x ? true : false`): More concise and readable approaches for specific use cases.

That's a deep breath of explanation!

Related benchmarks:

Boolean constructor vs double negotiation trick in javascript(test) (version: 0)

Comparing performance of: Boolean vs Double negation trick

Created: 3 years ago by: Guest

Jump to the latest result

Boolean

Double negation trick

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):