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Multiple ChoiceIntermediate 30s

in vs hasOwnProperty

Choose the best answer for: property existence checking
Options
  1. 1'prop' in obj checks prototype chain; hasOwnProperty does not
  2. 2'prop' in obj returns the value of the property or undefined
  3. 3'prop' in obj and hasOwnProperty are identical in behavior
  4. 4'prop' in obj only checks own properties, not the prototype
javascriptintermediate

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