Benchmark: filter falsy from arr

Script Preparation code:

var stuff = [3,,,,,,,4,,,6,2,,3,4,,,,8,7,,,,3];

Tests:

Boolean
stuff.filter(Boolean);
a => a
stuff.filter(a => a);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Boolean
a => a

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a JSON object that represents the test to be performed. It consists of three main parts:

*   **Name**: A unique name for the benchmark, which in this case is "filter falsy from arr".
*   **Description**: An optional description of the benchmark, which is currently null.
*   **Script Preparation Code**: A JavaScript code snippet that initializes a variable `stuff` with an array containing various values. This code is executed before running the benchmark test.
*   **Html Preparation Code**: An empty string, indicating that no HTML preparation code is required.

**Test Cases**

The benchmark defines two individual test cases:

1.  **Boolean**: A simple filter operation using the `Boolean` function to remove falsy values from the `stuff` array.
2.  **a => a**: Another filter operation using an arrow function with a single parameter `a` that removes falsy values from the `stuff` array.

**Options Compared**

In both test cases, two options are being compared:

*   Using the `Boolean` function to remove falsy values.
*   Using an arrow function (`a => a`) with a single parameter to remove falsy values.

**Pros and Cons of Each Approach**

Here's a brief overview of the pros and cons of each approach:

*   **Boolean**: This is a built-in JavaScript function that can be used to create a new array containing only truthy values. The main advantage is that it provides a concise way to remove falsy values.
    *   Pros:
        *   Easy to read and write
        *   Fast execution (native code)
    *   Cons:
        *   Not immediately clear what `Boolean` does, especially for those not familiar with JavaScript.
*   **a => a**: This is an arrow function that takes a single parameter `a`. The main advantage of this approach is that it provides more control over the filtering process and can be easily reused.

*   Pros:
        *   More control over the filtering process
        *   Can be reused with different filtering conditions.
    *   Cons:
        *   Requires JavaScript knowledge to understand arrow functions.
        *   May be slower due to overhead of function creation (although this is negligible in most cases).

**Library and Special JS Feature**

Neither of these approaches relies on a specific library or uses special JavaScript features like Promises, Async/Await, or Generators. The arrow function (`a => a`) does use the syntax of modern JavaScript, which might be unfamiliar to some developers.

**Other Alternatives**

If you need to filter falsy values in an array, other alternatives could include:

*   Using `Array.prototype.filter()` with a callback function.
*   Using `Array.prototype.every()` or `Array.prototype.some()`, which have different filtering behavior.

Here is an example of how you might use `Array.prototype.filter()`:
```javascript
const filteredArray = stuff.filter(function (item) {
    return item !== null && item !== undefined;
});
```
In this case, the `Boolean` function would not be suitable as it would remove falsy values but also null and undefined.

Keep in mind that each approach has its trade-offs. The best choice will depend on your specific use case and personal preferences.

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0

Browser/OS: Firefox 57 on Ubuntu

View result in a separate tab

Test name	Executions per second
Boolean	7255056.0 Ops/sec
a => a	7667082.5 Ops/sec

Related benchmarks:

filter falsy from arr (version: 0)

Comparing performance of: Boolean vs a => a

Created: 6 years ago by: Guest

Jump to the latest result

Boolean

a => a

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):