Benchmark: Boolean constructor vs double negotiation trick in javascript

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 negation trick
!!bFalse !!sEmpty !!sFilled !!nZero !!nOne

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:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser/OS: Firefox 142 on Windows

View result in a separate tab

Test name	Executions per second
Boolean	1843551232.0 Ops/sec
Double negation trick	1844487168.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark, specifically comparing two approaches to create a boolean value in JavaScript: using the `Boolean` constructor versus the double negation trick (`!!`).

**Script Preparation Code**

The script preparation code is a snippet of JavaScript code that sets up variables for the benchmark:

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

These variables are used to create instances of boolean values, empty strings, and integers.

**Html Preparation Code**

There is no HTML preparation code provided in this benchmark definition. It's likely that the `Html Preparation Code` field is intentionally left blank or not applicable for this specific benchmark.

**Test Cases**

The benchmark consists of two test cases:

1. **Boolean**: This test case uses the `Boolean` constructor to create instances of boolean values, empty strings, and integers.
2. **Double negation trick**: This test case uses the double negation trick (`!!`) to create instances of boolean values, empty strings, and integers.

**Library**

There is no explicit library mentioned in this benchmark definition. However, it's worth noting that some JavaScript engines may have optimizations or built-in functions that affect the behavior of the `Boolean` constructor or the double negation trick.

**Special JS Features/Syntax**

The double negation trick (`!!`) is a special syntax in JavaScript that converts its operand to a boolean value. This technique is often used to work around limitations in certain browsers or environments.

**Pros and Cons**

1. **Boolean Constructor**:
	* Pros:
		+ Clearly expresses intent
		+ Can be used with custom objects
	* Cons:
		+ May incur overhead due to function call
		+ Not optimized for performance by all JavaScript engines
2. **Double Negation Trick**:
	* Pros:
		+ Lightweight and efficient
		+ Widely supported across browsers and environments
	* Cons:
		+ Can lead to unexpected behavior if not used carefully
		+ May be perceived as less readable or maintainable

**Other Alternatives**

If the double negation trick is not acceptable, other alternatives could include:

1. Using a unary operator like `!!` directly on the operand.
2. Implementing a custom function that converts an object to a boolean value.

However, these alternatives might introduce additional overhead or complexity.

In summary, this benchmark compares two approaches to create instances of boolean values in JavaScript: using the `Boolean` constructor versus the double negation trick (`!!`). The test cases cover different use cases, including creating boolean values from custom objects. While there are pros and cons associated with each approach, the double negation trick is a widely supported and efficient solution for most use cases.

Related benchmarks:

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

Comparing performance of: Boolean vs Double negation trick

Created: 6 years ago by: Registered User

Jump to the latest result

Boolean

Double negation trick

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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