Benchmark: double-bang-vs-boolean-cast

Tests:

double-bang
!!0
cast
Boolean(0)

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 19 runs

double-bang

173.8M/s

cast

18.9M/s

Fastest: double-bang (9.2x faster)

View exact numbers

✓ double-bang: 173,833,072 ops/sec
• cast: 18,854,906 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
double-bang
cast

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

cast

172.8M/s

double-bang

167.0M/s

View exact numbers

Test name	Executions per second
✓ cast	172,830,192 Ops/sec
double-bang	167,017,808 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 benchmark and explain what's being tested.

**Benchmark Overview**

The MeasureThat.net website allows users to create and run JavaScript microbenchmarks. The provided benchmark definition is for a simple test case that compares two different approaches: using the "!!" operator (double-bang) versus casting a boolean value to true using `Boolean(x)`.

**Options Being Compared**

The options being compared are:

1. **Double Bang (`!!x`)**: This operator is used to force the JavaScript interpreter to evaluate the expression inside the double exclamation marks as a boolean value, regardless of its original type.
2. **Boolean Casting (`Boolean(x)`)**: This function takes an input value `x` and returns its equivalent boolean value.

**Pros and Cons of Each Approach**

1. **Double Bang (`!!x`)**:
	* Pros:
		+ Can be more readable and concise, especially for simple boolean checks.
		+ Avoids potential issues with type coercion.
	* Cons:
		+ May have performance implications due to the double evaluation.
		+ Not all JavaScript engines support this operator (e.g., some older versions of Internet Explorer).
2. **Boolean Casting (`Boolean(x)`)**:
	* Pros:
		+ Generally more readable and maintainable, especially for complex boolean checks.
		+ Can be more efficient, as it allows the browser to handle type coercion internally.
	* Cons:
		+ May require additional function calls, which can incur performance overhead.

**Library and Special Features**

In this benchmark, there is no specific library being used. However, MeasureThat.net uses the UAParser.js library to parse user agent strings and determine device platform, operating system, and browser information. This library is not directly related to the benchmark but provides essential metadata for the test results.

**Test Cases**

The individual test cases are:

1. **`!!0`**: Tests the double bang operator with a literal boolean false value.
2. **`Boolean(0)`**: Tests the Boolean casting function with an integer value (0).

These test cases help to isolate the effects of each approach on different input values.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are some additional options:

1. **Template Literals (`x !== null && x !== undefined ? 'true' : 'false'`)**: This syntax is more readable and maintainable for boolean checks, but it's not directly comparable to the double bang or Boolean casting approaches.
2. **Type Conversions (`Number(x)` or `String(x)`)**: You could use type conversions to achieve a similar effect as Boolean casting, although this might not be as efficient.

Keep in mind that these alternatives are not part of the original benchmark and may have different performance implications or requirements.

I hope this explanation helps you understand what's being tested in this benchmark!

double-bang-vs-boolean-cast (version: 0)

!!x vs Boolean(x)

Comparing performance of: `double-bang vs cast`

Created: 5 years ago by: Guest

Go to the latest result

double-bang

cast

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 19 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

double-bang-vs-boolean-cast (version: 0)

!!x vs Boolean(x)

Comparing performance of: double-bang vs cast

Created: 5 years ago by: Guest

Go to the latest result

double-bang

cast

Historical Performance Data aggregated from 19 community runs

Desktop Results:

Chrome 19 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `double-bang vs cast`