Answer & Solution
Answer: Option A
Solution:
In JavaScript ES6, inheritance is achieved using the 'extends' keyword followed by the superclass name in a subclass declaration.
Q
How do you inherit properties and methods from a...
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How do you access nested properties in an object?
A). obj.property.nestedProp (B21)
B). obj['property']['nestedProp'] (C21)
C). obj.property['nestedProp'] (D21)
D). obj['property'].nestedProp (E21)
How can you remove a property 'email' from an obj...
A). delete user.email;
B). user.remove('email');
C). user.email = null;
D). user.pop('email');
What does the Object.values(obj) method return?
A). An array of object keys.
B). An array of object values.
C). An array of object properties.
D). An array of object methods.
How do you define a method 'sayHello' in an obj...
A). person.sayHello = function() {};
B). person.sayHello: function() {};
C). person.sayHello = () {};
D). person.sayHello = function {};
How do you get the number of properties in an obj...
A). Object.keys(book).length
B). book.countProperties()
C). book.totalProperties()
D). book.length()
What is the correct way to create an empty object...
A). var obj = {};
B). var obj = ();
C). var obj = [];
D). var obj = <{}>;
How do you define a constructor function for crea...
A). function Car(make, model) { thi...
B). Car(make, model) { this.make = m...
C). var Car = function(make, model) ...
D). Car = function(make, model) { t...
What is the purpose of the 'super' keyword in a ...
A). It calls methods from the paren...
B). It creates a new instance of the...
C). It refers to the current object.
D). It checks for property existence.
What will console.log(obj.toString()) output?
A). The string representation of...
B). The object itself.
C). An error.
D). 1
How do you add a new property 'age' with value 25...
A). person.age = 25;
B). person['age'] = 25;
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