Week 8.1

How do you declare an empty array in JavaScript?

• var snacks = "";

• var snacks = {};

• var snacks = [];

• var snacks = null;

Which index number is assigned to the first element of an array?

• 0

• 1

• -1

• +1

What is the result of the following code snippet?

var snacks = ["chips", "soda", "dip"];

document.write(snacks[1]);

• chips

• soda

• dip

Which method can be used to display all the elements of an array with commas between them?

Choose 2

• toString()

• join()

• display()

• print()

What keyword is used to instantiate an object based on a constructor?

• new

• create

• instance

• make

In the given example, what are the parameters of the Cat constructor?

function Cat(name, weight, paidYet) {

this.name = name;

this.weight = weight;

this.isLicensed = paidYet; }

• this.name, this.weight, this.isLicensed

• catName,

  catWeight,

  catPaidYet

• Catname,

  Catweight,

  Catpaidyet

• name,

  weight,

  paidYet

Which of the following is a valid way to create an object in JavaScript?

Choose 3

• var object1 = Object.create(obj);

• var object = {key : value}

• var object = new Object();

• function Object(name, age)

  { this.name = name;

  this.age = age; }

What is the purpose of the 'this' keyword in JavaScript?

• It refers to the current object

• It refers to the parent object

• It refers to the global object

• It refers to the object's prototype

How do you access a property of a JavaScript object literal?

var nameProp = "name"

var person1 = {name: "John", class: "IT102"};

• person1.name;

• person1["name"]

• person1[nameProp]

Which of the following is the syntax for defining a Constructor Function (Object Constructors) in JavaScript?

• constructor function() { }

• function() constructor { }

• function Constructor() { }