Benchmark: double vs bool - MeasureThat.net

Script Preparation code:

const item = {
    name: 'sda'
};

function double() {
    return !!item.name;
}

function bool() {
    return Boolean(item.name);
}

Tests:

double
double()
bool
bool()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
double
bool

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 125 on Android

View result in a separate tab

Test name	Executions per second
double	9468435.0 Ops/sec
bool	3522397.2 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its components.

**Benchmark Definition JSON**

The benchmark definition is a JSON object that contains metadata about the benchmark being tested. Here's what it tells us:

* **Name**: The name of the benchmark, which is "double vs bool".
* **Description**: An empty string, suggesting that no additional description or context is provided.
* **Script Preparation Code**: This section defines two JavaScript functions: `double()` and `bool()`. Both functions take no arguments and return a boolean value. However, they achieve this in different ways:
	+ `double()`: Returns the result of the double-tilde operator (`!!`) applied to the string representation of an object's property `item.name`. This is equivalent to a simple type cast of `item.name` to a boolean.
	+ `bool()`: Returns the result of the built-in JavaScript function `Boolean()` applied to the string representation of an object's property `item.name`. This is a more explicit way to convert a value to a boolean.
* **Html Preparation Code**: An empty string, indicating that no HTML preparation code is necessary for this benchmark.

**Individual Test Cases**

The individual test cases are two separate benchmarks:

1. **double()**: Tests the performance of the `double()` function.
2. **bool()**: Tests the performance of the `bool()` function.

Both functions are designed to return a boolean value, but they do so in different ways, which is the focus of this benchmark.

**Pros and Cons**

The two approaches have the following advantages and disadvantages:

* **Type Casting with `!!` (double())**:
	+ Pros: Simple and efficient way to convert a string to a boolean.
	+ Cons: Can be fragile if the input string contains non-boolean values, which may lead to unexpected results or errors.
* **Using `Boolean()` (bool())**:
	+ Pros: More explicit and controlled way to convert a value to a boolean, reducing the risk of errors.
	+ Cons: May be slower due to the additional function call.

**Library Used**

There is no explicit library mentioned in the benchmark definition. However, it's worth noting that both functions rely on built-in JavaScript features, such as the `!!` operator and the `Boolean()` function.

**Special JS Feature or Syntax**

The use of the double-tilde operator (`!!`) is a special feature in JavaScript, which can be used to create a boolean value from a string. This syntax is not explicitly defined in the standard, but it's widely supported by most modern JavaScript engines.

**Alternatives**

Other alternatives for creating boolean values from strings might include:

* Using `parseInt()` or `parseFloat()` with the second argument set to 0 (e.g., `parseInt(item.name, 2)`)
* Utilizing a regular expression to extract the boolean value from the string (e.g., using `RegExp.test(item.name, /^true|false$/i)`)

However, these alternatives may not be as concise or readable as the original implementation.

Related benchmarks:

double vs bool (version: 0)

Comparing performance of: double vs bool

Created: one year ago by: Guest

Jump to the latest result

double

bool

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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