What does the !! double exclamation mark operator do in JavaScript?

Author: Jerry Peter · Published: November 1, 2025 · Category: Komputer Dasar

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By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. These operators are often used to provide a default value if the first one is missing. Related to Is there a “null coalescing” operator in JavaScript? Find centralized, trusted content and collaborate around the technologies you use most.

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Ternary operator is just a simple way to write if else condition. It’s a little hard to google when all you have are symbols 😉 The terms to use are “JavaScript conditional operator”. In case you encounter (or want to use) a ternary in a situation like ‘display a variable if it’s set, else…’, you can make it even shorter, without a ternary. This said, in case you use create-react-app 3.3.0+ you can start using the null-coalesce operator already today in your React apps. This means that the proposal is ready for inclusion in the formal ECMAScript standard. You can already use it in recent desktop versions of Chrome, Edge and Firefox, but we will have to wait for a bit longer until this feature reaches cross-browser stability.

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What does the !! double exclamation mark operator do in JavaScript?

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