Benchmark: Double bang vs Boolean

Script Preparation code:

var arr = ['1', '2', '3', '4', '5'];

Tests:

double bang
!!(arr.length);
cast
Boolean(arr.length);

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: 2 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 Edg/149.0.0.0

Browser/OS: Chrome 149 on Windows

View result in a separate tab

Test name	Executions per second
double bang	171867856.0 Ops/sec
cast	172559408.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark is designed to compare two approaches: using the double bang operator (`!!`) versus casting the boolean value to `Boolean()`.

**Tested Aspects**

The test measures the execution time of the two approaches:

1. Double Bang Operator: `!!(arr.length)`
2. Casting to Boolean: `Boolean(arr.length)`

These expressions have different performance characteristics, which are being compared in this benchmark.

**Options Compared**

There are two options being compared:

1. **Double Bang Operator**: The double bang operator is a shorthand way of converting a value to a boolean using the `!` operator and then re-`!`ing it. This creates a temporary number object, converts it to a boolean, and then converts it back to a boolean.
2. **Casting to Boolean**: Casting a value to `Boolean()` explicitly converts the value to a boolean.

**Pros and Cons of Each Approach**

1. **Double Bang Operator**
	* Pros:
		+ Shorter code
		+ Less overhead due to explicit casting
	* Cons:
		+ Can be slower due to temporary object creation
2. **Casting to Boolean**
	* Pros:
		+ More explicit and readable code
	* Cons:
		+ Longer code
		+ May incur additional overhead due to explicit casting

**Other Considerations**

When writing JavaScript code, it's essential to consider the trade-offs between conciseness, readability, and performance. In this benchmark, the choice of operator can significantly impact execution time.

**Library Usage**

There is no explicit library mentioned in the provided JSON, but MeasureThat.net often uses external libraries for benchmarking. If a test case uses a library, it would likely be used to measure or compare specific aspects of JavaScript performance.

**Special JS Features or Syntax**

The double bang operator (`!!`) and casting to `Boolean()` are standard JavaScript features that have been around since the early days of the language. There is no special syntax or feature being tested here; rather, it's a straightforward comparison of two different approaches.

**Alternative Approaches**

If you want to explore alternative approaches, consider:

1. Using `Number()` instead of casting: `Number(arr.length)`
2. Using template literals for string concatenation
3. Implementing your own custom boolean conversion function

Keep in mind that each approach has its trade-offs, and the best choice depends on the specific use case and performance requirements.

I hope this explanation helps you understand the benchmark and make informed decisions about JavaScript optimization strategies!

Related benchmarks:

Double bang vs Boolean (version: 0)

Comparing performance of: double bang vs cast

Created: 3 years ago by: Guest

Jump to the latest result

double bang

cast

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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