Benchmark: js boolean conversion

Tests:

!!
let a = !!12; let b = !!'string';
Boolean
let a = Boolean(12); let b = Boolean('string');
Comparison
let a = (12 == true); let b = ('string' == true);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!!
Boolean
Comparison

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
!!	194155328.0 Ops/sec
Boolean	152396816.0 Ops/sec
Comparison	43507520.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

**Overview**

The benchmark measures the performance of three different ways to convert values to booleans (true or false) in JavaScript:

1. Using the double bang `!!` operator
2. Using the built-in `Boolean()` function
3. Using equality comparisons (`== true`)

**Options Compared**

Here's a brief overview of each option being compared:

* **!!**: The double bang operator is a shorthand way to convert a value to a boolean. It works by checking if the value is truthy (i.e., not zero, null, undefined, or an empty string) and then casting it to a boolean.
* **Boolean()**: This is a built-in JavaScript function that takes a single argument and returns its boolean equivalent.
* **Comparison**: This option uses equality comparisons (`== true`) to convert values to booleans. It's not as straightforward as the other two options, but it works by checking if the value is equal to `true`.

**Pros and Cons**

Here are some pros and cons of each approach:

* **!!**:
	+ Pros: Short and concise, easy to read.
	+ Cons: May be slower than using `Boolean()` because it involves an additional operation (the bang operator).
* **Boolean()**:
	+ Pros: Fast, straightforward, and easy to understand.
	+ Cons: Requires a function call, which may incur overhead.
* **Comparison**:
	+ Pros: Works with any value that can be compared using `==`, including non-boolean values.
	+ Cons: Less readable and maintainable than the other two options.

**Library Usage**

None of the benchmark tests use external libraries.

**Special JS Features or Syntax**

None of the benchmark tests use special JavaScript features or syntax, such as async/await, generators, or decorators.

**Other Alternatives**

If you're interested in exploring alternative ways to convert values to booleans, here are a few examples:

* Using `Number()` and checking if the result is zero: `let a = Number(12); let b = Number('string');`
* Using a regex pattern: `let a = /^[\d]+$/g.test('12'); let b = /^[\d]+$/.test('string');`

Keep in mind that these alternatives may not be as readable or maintainable as the original options.

I hope this explanation helps!

Related benchmarks:

js boolean conversion (version: 0)

Comparing performance of: !! vs Boolean vs Comparison

Created: 5 years ago by: Guest

Jump to the latest result

!!

Boolean

Comparison

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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