Jul 11, 2025 · A falsy (sometimes written falsey) value is a value that is considered false when encountered in a Boolean context.

The idea of terms like "truthy" and "falsy" simply refer to those values which are considered True in cases like those described above, and those which are considered False.

Mar 31, 2013 · I have seen both spellings of this word, falsy and falsey. It can mean "something that is equivalent to false" in computer science, such as "The only two falsy values in the Ruby Language …

Apr 4, 2026 · The meaning of FALSITY is something false : lie. How to use falsity in a sentence.

Jan 9, 2025 · If the first operand (which comes before the question mark--doIt, in this example) is truthy, the expression evaluates to the second operand (between the question mark and colon), and if it's …

Aug 5, 2025 · In JavaScript, truthy and falsy values are concepts related to boolean evaluation. Every value in JavaScript has an inherent boolean "truthiness" or "falsiness," which means they can be …

Sometimes these classes of expressions are called falsy and truthy. For example, in Lisp, nil, the empty list, is treated as false, and all other values are treated as true.

Aug 19, 2021 · Each value in JavaScript has an inherent Boolean value, known as either truthy or falsy. Falsy values include false, 0, -0, 0n, ”, null, undefined, and NaN.

Falsy definition: (JavaScript) Evaluating to <a>false</a> in a <a>Boolean</a> context.

Jan 11, 2025 · In this blog, we’ll take a deep dive into what truthy and falsy values are in JavaScript, how they work, and how they can make your code more efficient and cleaner.