Benchmark: Boolean constructor vs double negate vs single negate

Script Preparation code:

var bFalse = false;
var sEmpty = '';
var sFilled = 'Foo';
var nZero = 0;
var nOne = 1;

Tests:

Boolean
Boolean(bFalse) Boolean(sEmpty) Boolean(sFilled) Boolean(nZero) Boolean(nOne)
Double negate
!!bFalse !!sEmpty !!sFilled !!nZero !!nOne
Single negation
!bFalse !sEmpty !sFilled !nZero !nOne

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Boolean
Double negate
Single negation

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Overview**

The benchmark compares three approaches for creating boolean values in JavaScript: the `Boolean` constructor, double negation (`!!`), and single negation (`!`). The test cases create four different boolean values using each approach and compare their performance.

**Options Compared**

1. **Boolean Constructor**: Creates a new boolean value by wrapping the input value in parentheses.
2. **Double Negation (!!)**: Negates the input value twice, which effectively creates a boolean value.
3. **Single Negation (!)**: Negates the input value once, creating a boolean value.

**Pros and Cons of Each Approach**

1. **Boolean Constructor**:
	* Pros: Explicitly creates a new boolean object, which can be useful in certain scenarios (e.g., when using `Object.create()`.
	* Cons: Creates a new object instance on each execution, which can lead to performance overhead.
2. **Double Negation (!!)**:
	* Pros: Efficient and concise way to create boolean values, as it leverages the existing negation operation in JavaScript.
	* Cons: May be perceived as less readable or maintainable due to its unusual syntax.
3. **Single Negation (!)**:
	* Pros: Similar efficiency to double negation, with a more conventional syntax.
	* Cons: Can lead to unexpected behavior if not used carefully (e.g., when working with `null` or `undefined` values).

**Library and Special JS Features**

None of the benchmark test cases rely on specific libraries. However, it's worth noting that the use of double negation (`!!`) is a common pattern in JavaScript development, particularly for creating boolean values.

**Other Considerations**

When working with boolean values in JavaScript, consider the following:

* Use `Boolean()` or `!!` when you need to create boolean values explicitly.
* Avoid using single negation (`!`) unless it's necessary for clarity or performance reasons.
* Be cautious when working with `null` and `undefined` values, as they can lead to unexpected behavior when used with the negation operator.

**Alternatives**

If you're interested in exploring alternative approaches for creating boolean values, consider the following options:

1. **Use a helper function**: Instead of relying on the negation operator or constructor, create a custom function that wraps the input value in parentheses.
2. **Leverage `Number()`**: Convert the input value to a number using `Number()`, which returns 0 for falsey values and NaN for truthy values.

For example:
```javascript
function boolean(value) {
  return Number(value);
}
```
Keep in mind that these alternatives may not offer significant performance benefits, but they can provide an interesting alternative perspective on creating boolean values.

Related benchmarks:

Boolean constructor vs double negate vs single negate (version: 0)

Comparing performance of: Boolean vs Double negate vs Single negation

Created: 4 years ago by: Registered User

Jump to the latest result

Boolean

Double negate

Single negation

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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