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Questions and Answers
Which of the following is true about object-oriented languages?
Which of the following is true about object-oriented languages?
- They do not have a mechanism for encapsulation and structuring
- They do not support inheritance
- They have class constructors for encapsulation and structuring (correct)
- They do not have class constructors
What is the purpose of a constructor function in JavaScript?
What is the purpose of a constructor function in JavaScript?
- To consolidate properties and methods for a class of objects (correct)
- To extend the functionality of an object
- To trigger the creation of a new object
- To allow for easy sharing of properties and methods between objects
What is the role of prototypes in JavaScript?
What is the role of prototypes in JavaScript?
- To create a new object
- To allow for easy sharing of properties and methods between objects (correct)
- To prevent inheritance between objects
- To limit the functionality of an object
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Study Notes
- Prototypes and their properties can be inherited, creating a chain of inheritance.
- Objects have access to the prototype of their parent.
- A property search against an object includes its own prototype and its parent's prototype.
- Object-oriented languages like Java and C++ have class constructors for encapsulation and structuring.
- JavaScript offers a similar mechanism through constructor functions and the new operator.
- JS does not have a true class definition.
- The new operator in JS triggers the creation of a new object.
- The constructor function consolidates properties and methods for a class of objects.
- JS prototypes allow for easy sharing of properties and methods between objects.
- Prototypes can be used to extend the functionality of an object.
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