Trivia On JavaScript: MCQ Quiz

The statement is true because in JavaScript, every object has a prototype, which is an object from which it inherits properties and methods. The prototype for the string "hi" is String.prototype, which is the prototype object for all string objects. And the prototype for String.prototype is Object.prototype, which is the prototype object for all objects in JavaScript. Therefore, the prototype chain for "hi" goes from String.prototype to Object.prototype.

When a function is used as a constructor with the "new" keyword, it creates a new object. The value of "this" inside the constructor refers to this newly created object. If the constructor function does not have an explicit return statement, the newly created object will be considered as the return value. Therefore, the statement "When used as a constructor, like a new MyFunction(), the value of this will be a brand new object provided by the JavaScript runtime. If we don't explicitly return anything from that function, this will be considered its return value" is true.

The statement is true because both the apply and call methods can be used to override the value of "this" in JavaScript. These methods allow you to explicitly set the value of "this" within a function, allowing you to control the context in which the function is executed. This can be useful when you want to invoke a function with a specific object as the value of "this", rather than the default value determined by how the function is called.

In JavaScript, when an object is created using a constructor function, its prototype property is automatically set to the constructor's prototype object. In the given scenario, the Manager object is created using the Employee constructor, so its prototype property would be set to the Employee constructor's prototype object. Therefore, the statement "Manager.prototype = new Employee();" sets the prototype of Manager to the Employee constructor's prototype object. And the statement "Manager.constructor.prototype = Manager;" sets the constructor's prototype of Manager to itself. Hence, the correct answer is true.

This code adds a static method called ShowAge to the Employee function. Static methods are attached to the function itself, rather than the objects created from the function. Therefore, this method would not be available to the objects created from the Employee function. This statement is true.

In a function called directly without an explicit owner object, like myFunction(), causes the value of this to be the default object (window in the browser). In a function called using the method invocation syntax, like obj.myFunction() or obj['myFunction'](), causes the value of this to be obj.

In a function called directly without an explicit owner object, like myFunction(), causes the value of this to be the default object (window in the browser).