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Chapter 3. Objects > Reflection

3.6. Reflection

It is easy to inspect an object to determine what properties it has by attempting to retrieve the properties and examining the values obtained. The typeof operator can be very helpful in determining the type of a property:

typeof flight.number      // 'number'
typeof flight.status      // 'string'
typeof flight.arrival     // 'object'
typeof flight.manifest    // 'undefined'


  

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