Benchmark: Boolean constructor vs double negotiation trick in javascript ewsd

Script Preparation code:

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

Tests:

Boolean
for(i=0;i<10000;i++){ Boolean(bFalse) Boolean(sEmpty) Boolean(sFilled) Boolean(nZero) Boolean(nOne) }
Double negation trick
for(i=0;i<10000;i++){ !!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: 5 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Windows

View result in a separate tab

Test name	Executions per second
Boolean	3135.8 Ops/sec
Double negation trick	3403.8 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 provided benchmarking setup and explain what's being tested.

**Benchmark Overview**

The test case measures the performance of two different approaches in JavaScript: using the `Boolean` constructor and the double negation trick (`!!`). Both methods are used to evaluate a set of variables (`bFalse`, `sEmpty`, `sFilled`, `nZero`, and `nOne`) as booleans.

**Options Compared**

There are two main options being compared:

1. **Using the `Boolean` constructor**: This involves creating an instance of the `Boolean` class for each variable, like this: `new Boolean(bFalse)`. The constructor returns a new object with a `valueOf()` method that returns the boolean value.
2. **Double negation trick (`!!`)**: This approach uses the double bang operator (`!!`) to force the evaluation of a value as a boolean. For example, `!!bFalse` evaluates `bFalse` as true or false.

**Pros and Cons**

1. **Using the `Boolean` constructor**:
	* Pros: explicit, clear intention (creating a new Boolean object), potentially more readable code.
	* Cons: overhead of creating an object instance, slower due to object creation.
2. **Double negation trick (`!!`)**:
	* Pros: concise, faster (due to avoiding object creation).
	* Cons: might be less readable, can lead to unexpected behavior if not used carefully.

**Library/Dependency**

There is no explicit library or dependency mentioned in the benchmark definition. However, it's worth noting that some modern JavaScript engines and browsers have optimized `Boolean` constructor usage, making it faster than using the double negation trick.

**Special JS Features/Syntax**

The test case uses the double bang operator (`!!`) to force evaluation as a boolean. This is a standard JavaScript feature introduced in ECMAScript 2011 (ES6). It's used here to evaluate the variables without explicitly creating a `Boolean` object.

**Other Considerations**

* **Readability**: The `Boolean` constructor approach might be more readable, especially for developers familiar with it. The double negation trick can make code less readable if not used correctly.
* **Caching and Optimization**: Modern browsers often cache the results of previous evaluations using the same variables, so this test case might not accurately reflect real-world performance differences.
* **Browser variations**: Different browsers may optimize or implement these features differently, affecting benchmark results.

**Alternatives**

If you're interested in exploring alternative approaches, consider testing:

1. Using `Boolean` constructor alternatives, such as `true` and `false`.
2. Other boolean evaluation methods, like using `Number()` with a value of 0.
3. Non-standard or experimental features, if available.

Keep in mind that the performance differences between these approaches might be negligible in most cases, and benchmarking should focus on identifying performance issues rather than minor optimizations.

Related benchmarks:

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

Comparing performance of: Boolean vs Double negation trick

Created: 4 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

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