Benchmark: doubleNot vs Boolean array filter

Script Preparation code:

var doubleNot = x => !!x;

var arr = [0, NaN, 1, "", "a", true, false, undefined, null, {}, []];

Tests:

doubleNot
arr.filter(doubleNot)
Boolean
arr.filter(Boolean)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
doubleNot
Boolean

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what is tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark definition represents two different approaches to filtering an array using JavaScript:

1. `doubleNot(x) => !!x`
2. `[arr.filter(Boolean)]`

**Options Compared**

* `doubleNot(x) => !!x`: This approach uses a function that takes an element as input and returns its boolean equivalent using the double NOT operator (`!!`). The idea is to check if the element is falsy (i.e., `false`, `0`, `NaN`, etc.) by negating it twice, effectively converting it to a boolean value.
* `[arr.filter(Boolean)]`: This approach uses the built-in `filter()` method with the `Boolean` object as its callback function. The idea is to apply a boolean conversion to each element in the array before filtering.

**Pros and Cons**

1. **doubleNot(x) => !!x**:
	* Pros: This approach can be more efficient, especially when dealing with small arrays or specific use cases where the double NOT operator has a specific meaning.
	* Cons: It may not be as readable or intuitive for developers who are not familiar with this operator, and it can lead to confusion if not used carefully. Additionally, it may not work correctly for all types of falsy values (e.g., NaN).
2. `[arr.filter(Boolean)]`:
	* Pros: This approach is more readable and widely understood by developers, as it explicitly uses a boolean conversion function.
	* Cons: It may be slower or less efficient than the first approach, especially for larger arrays.

**Library and Special JS Features**

There are no libraries mentioned in this benchmark definition. However, the `!!` operator is a special JavaScript feature that can be used to convert a value to a boolean.

**Other Alternatives**

If you need to filter an array of numbers or other values based on their truthiness, you might consider using the following alternatives:

* Using a custom function like `x => x !== 0`: This approach is more explicit and readable but may not be as efficient.
* Using the `Number.isFinite()` method: This approach is more precise when dealing with numeric values but may not work correctly for other types of falsy values.

In conclusion, both approaches have their pros and cons. The choice between them depends on your specific use case, performance requirements, and personal preference.

Related benchmarks:

doubleNot vs Boolean array filter (version: 0)

Comparing performance of: doubleNot vs Boolean

Created: 3 years ago by: Guest

Jump to the latest result

doubleNot

Boolean

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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