Practice Questions for Microsoft Exam 70-480, Module 7

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In strict mode, what will print on the Chrome console with the following code?

(function() { 
  console.log(a); 
  var a='Hello!'; 
})();

Hello! undefined Uncaught ReferenceError: a is not defined

In strict mode, what will print on the Chrome console with the following code?

(function() { 
  console.log(f()); 
  var f = function() { return 'Hello!'; } 
})();

Hello! undefined Uncaught TypeError: f is not a function

How could you make a function part of a namespace?

MyNamespace.myFunction = function() { /* */ } MyNamespace = { myFunction: function() { /* */ } } myFunction.setNamespace('MyNamespace');

What will this code print on the Chrome console? console.log(Math.parseInt('123'))

123 undefined Uncaught TypeError: Math.parseInt is not a function

Which CSS instructions will cause text to break only on word boundaries?

word-wrap: break-word; word-wrap: no; word-wrap: yes; word-wrap: normal; word-wrap: off; word-wrap: on;

What differences will there be between objects a and b after var a = new Object(); var b = { };?

Object a will have certain built-in methods that object b will not have. Functions later defined on object a will have a meaningful "this" variable but those later defined on object b will not. Although a and b refer to different objects, those objects are identical.

What will print on the console?

var a={ 
  counter: 111, 
  printCounter: function() { console.log(this.counter); } 
}; 
var b = { 
  counter: 222 
}; 
b.printCounter = a.printCounter;
b.printCounter();

111 222 undefined

Which of the following are true when you create an object with the new keyword?

The object’s prototype property refers to the object itself. The object’s constructor property refers to the constructor function. Directly inside the constructor function, the "this" keyword to refers to the function itself. Directly inside the constructor function, the "this" keyword refers to the newly created object.

What will be printed on the Chrome console after the following code?

var MyConstructor = function() { 
  this.a = 123; 
}; 
var first = new MyConstructor();
MyConstructor.prototype.protofunc = function() { console.log(this.a); } 
var second = new MyConstructor(); 
second.protofunc();

123 undefined Uncaught TypeError: second.protofunc is not a function

You have the following constructor function and a function on its prototype. What will be true of the haveBirthday function?

var Person = function() { 
  var age; 
  /* more code */ 
}
Person.prototype = { 
  haveBirthday: function() { /* more code */ } 
};

It saves memory compared to defining it within the Person constructor because all constructed Persons will have the same prototype function. It can access the variable age defined in the Person constructor. None of the above.