Web Reference: Objects are true, but the undefined value and null are both false. The double negation operator !! calculates the truth value of a value. It's actually two operators, where !!x means !(!x), and behaves as follows: If x is a false value, !x is true, and !!x is false. If x is a true value, !x is false, and !!x is true. Jul 23, 2025 · This technique involves using two negation operators (!) to negate a value twice, resulting in a boolean representation of the original value. The double negative technique is often used to convert truthy and falsy values to their corresponding boolean values. Jan 16, 2026 · Double negation in JavaScript is the use of two consecutive logical NOT operators (!), written as !!value. It is a unary operator, meaning it operates on a single operand (the value in this case). At its core, !! is a shorthand for converting any JavaScript value into its boolean equivalent.
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