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What’s the Difference Between null and undefined in JavaScript?

  • In JavaScript, null and undefined both represent "empty" values, but they serve different purposes and are used in specific contexts.
  • undefined indicates a variable has been declared but not assigned a value, or it refers to a property that doesn’t exist on an object.
  • null is an explicit assignment to signify an intentional absence of any value, often used to indicate "no value" or "empty" when resetting or clearing an existing value.
  • Using null and undefined intentionally clarifies the code's purpose and avoids unexpected behavior.

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