JavaScript - check if all values in array are falsy

In this article, we would like to show you how to check if all values in the array are falsy in JavaScript.

In this example, we use every() method to check if all values in the array are falsy.

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const falsyCheck = (array) => array.every((element) => !element);

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// Usage example

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const falsyValues = [false, 0, -0, 0n, '', '', ``, null, undefined, NaN];

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console.log(falsyCheck(falsyValues)); // true

Note:

The every() method returns true only when all elements in the array pass the test implemented by the provided function (when all negated elements are truthy).

1. JavaScript - Truthy and Falsy values

2. JavaScript - remove all falsy values from array

1. Array.prototype.every() - JavaScript | MDN
2. Falsy - MDN Web Docs Glossary: Definitions of Web-related terms