Falsy Bouncer - JavaScript

Introduction

Falsy Bouncer is a simple function that filters out falsy values from an array in JavaScript. Falsy values are values that evaluate to false in a boolean context, such as false, null, undefined, 0, NaN, and an empty string ('').

The Falsy Bouncer function takes an array as an argument, filters out all falsy values from the input array, and returns a new array with only the truthy values.

In this article, we will learn how to implement the Falsy Bouncer function in JavaScript and explore some use cases.

Implementation

Here is the code for the Falsy Bouncer function in JavaScript:

function falsyBouncer(arr) {
  return arr.filter(Boolean);
}

The filter() method creates a new array with all elements that pass the test implemented by the provided function. In this case, the provided function is Boolean, which is a built-in function in JavaScript that evaluates the truthiness of a value. When applied to an array, filter(Boolean) returns a new array with only the truthy values.

Examples

Let's see some examples of how the Falsy Bouncer function works.

falsyBouncer([null, 1, 2, undefined, 3, NaN, '', 4, false, 5]); // [1, 2, 3, 4, 5]
falsyBouncer(['', 'hello', undefined, null, false, 0]); // ['hello']
falsyBouncer([[], {}, true, 42]); // [[], {}, true, 42]

As you can see, the Falsy Bouncer function removes all falsy values from the input array and returns a new array with only the truthy values.

Conclusion

The Falsy Bouncer function is a useful tool for filtering out falsy values from an array in JavaScript. It is simple, concise, and easy to understand. By using this function, you can ensure that your array contains only the values that are actually meaningful and relevant to your application.