Podcast
Questions and Answers
In JavaScript, when does it make sense to use object composition?
In JavaScript, when does it make sense to use object composition?
- When the superclass and subclass share the same properties
- When the subclass has no access to features of the superclass
- When the subclass adds new features to the superclass
- When one object has a type of another object (correct)
What would be the result of calling arr.unshift('Grace') after initializing the NumberArray object?
What would be the result of calling arr.unshift('Grace') after initializing the NumberArray object?
- It would remove the last element from the array
- It would add 'Grace' to the end of the array
- It would throw a TypeError because the method isn't defined (correct)
- It would display 'Grace' as the first element of the array
What does data hiding refer to in terms of object composition?
What does data hiding refer to in terms of object composition?
- Sharing all data publicly between objects
- Exposing all data for external manipulation
- Allowing unrestricted access to private data
- Keeping data inaccessible from outside the object (correct)
Which term is synonymous with object composition?
Which term is synonymous with object composition?
What does it mean when one object has a type of another object in terms of object composition?
What does it mean when one object has a type of another object in terms of object composition?
Why would a subclass restrict access to features of the superclass in object composition?
Why would a subclass restrict access to features of the superclass in object composition?
What is the main benefit of using inheritance in object-oriented programming?
What is the main benefit of using inheritance in object-oriented programming?
Which syntax is used for a concise method declaration in JavaScript?
Which syntax is used for a concise method declaration in JavaScript?
In the context of classes in JavaScript, what does the 'super' keyword refer to?
In the context of classes in JavaScript, what does the 'super' keyword refer to?
What action does the lib_trips.js file take if the miles and gallons values in the Trip class are not valid?
What action does the lib_trips.js file take if the miles and gallons values in the Trip class are not valid?
What benefit does using JavaScript libraries provide?
What benefit does using JavaScript libraries provide?
Which operator is used to delete a property from an object in JavaScript?
Which operator is used to delete a property from an object in JavaScript?
In the provided code snippet, what does 'emp instanceof Person' evaluate to?
In the provided code snippet, what does 'emp instanceof Person' evaluate to?
What happens if a non-number value is pushed into a 'NumberArray' object?
What happens if a non-number value is pushed into a 'NumberArray' object?
What does the 'instanceof' operator do in JavaScript?
What does the 'instanceof' operator do in JavaScript?
Which term refers to a class that inherits properties and methods from another class?
Which term refers to a class that inherits properties and methods from another class?
In the context of JavaScript, what is meant by 'reference to an object'?
In the context of JavaScript, what is meant by 'reference to an object'?
Which aspect of code organization is encouraged by JavaScript libraries?
Which aspect of code organization is encouraged by JavaScript libraries?
What is the purpose of the constructor in the Invoice class?
What is the purpose of the constructor in the Invoice class?
What type of property in JavaScript can only be read but not written to?
What type of property in JavaScript can only be read but not written to?
How many arguments are passed to the constructor when creating invoice2?
How many arguments are passed to the constructor when creating invoice2?
Which jQuery method is used to empty the HTML content of an element with the id 'tasks'?
Which jQuery method is used to empty the HTML content of an element with the id 'tasks'?
What does the class Trip represent in the Trips app?
What does the class Trip represent in the Trips app?
Which method is responsible for clearing the task list in the Trip class?
Which method is responsible for clearing the task list in the Trip class?
In the context of the Invoice class, what does the statement const invoice = new Invoice(100, 0.0875); achieve?
In the context of the Invoice class, what does the statement const invoice = new Invoice(100, 0.0875); achieve?
What does the 'isValid' property in the Trip class indicate?
What does the 'isValid' property in the Trip class indicate?
What is the primary role of the fullName method in the Person class?
What is the primary role of the fullName method in the Person class?
When creating a new Person object, what parameters are required in the constructor?
When creating a new Person object, what parameters are required in the constructor?
What does the statement console.log(p instanceof Object); verify about object p?
What does the statement console.log(p instanceof Object); verify about object p?
