What does Object.keys(obj) 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 create an instance of the 'Car' objec...
A). var myCar = new Car('Toyota', ...
B). var myCar = Car('Toyota', 'Corol...
C). var myCar = create Car('Toyota',...
D). var myCar = construct Car('Toyo...
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 is the output of console.log(obj.prop) if ob...
A). It prints undefined.
B). It throws an error.
C). It prints null.
D). It prints true.
How do you iterate over all properties of an obj...
A). for (var prop in person)
B). forEach(prop in person)
C). for (var prop of person)
D). forEach(prop of person)
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 add a method to an object created wit...
A). this.methodName = function() {}
B). this.methodName: function() {};
C). this.methodName = () {}
D). this.methodName: () {}
What will console.log(obj.toString()) output?
A). The string representation of...
B). The object itself.
C). An error.
D). 1
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 access a property called 'name' from an...
A). person.name
B). person['name']
C). person->name
D). person::name