Do Not Declare Strings, Numbers, and Booleans as Objects! Mockest | JavaScript

11.

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.

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12.

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()

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13.

What will console.log(obj.toString()) output?

A). The string representation of... B). The object itself. C). An error. D). 1

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14.

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...

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15.

What is the purpose of the "this" keyword in a co...

A). It refers to the new object bei... B). It refers to the global object. C). It refers to the current object. D). It refers to the parent object.

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16.

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...

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17.

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: () {}

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18.

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.

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19.

How do you inherit properties and methods from a...

A). class SubClass extends SuperClas... B). class SubClass inherits SuperCla... C). class SubClass implements Super... D). class SubClass derives SuperCla...

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20.

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)

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Do Not Declare Strings, Numbers, and Booleans as Objects! Mocktest

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