Review Test Submission: Review 5: Arrays & Objects

What is an array

An array is able to store more than one value in a single variable.

Which of the following is the correct way to declare an array?

var myFriends = ["Joe", "Jane"];

For the array cities, with members Boston and New York (in that order), you would refer to Boston as cities[0].

True

myFriends.length will have the value of the number of items in the array myFriends.

TrueThe length property returns the total number of elements in an array.

declare an array called vegetables that will store the following vegetables:  broccoli, peas, and carrots.

var vegetables = ["broccoli", "peas", "carrots"];

use a loop to display the following items in this array, each on a separate line:  cards = ["ace", "king", "queen", "jack"];

var y = 20;

for(var i=0; i<3; i++){

     fill(255,0,0);

     text(cards[i], 20, y);

    y =+20;

}

if you wish to add a value to the end of an array, you can use the pop command.

false

You would like to remove the last item in the cards array, and replace it with a "ten".  List the two commands needed to do that.

cards.pop();

card.push("ten");

If you wish to display the number of items in the cards array in the sentence, I have <number of cards> in my hands, you could do it like this:

fill(255, 0, 0);

text("I have " + cards.length + " in my hands.", 20, 20);

true You would need to use the length property of the array to display the number of items.

Here are two variables about the same person, Jim:

var jimName = "Jim";

var jimAge = 19;

If you wanted to create an object, called jim, and put those two variables inside, which of the following would be the correct way?

var jim = {  

   jimName: "Jim",

   jimAge: 19

};

an object can contain an array, and an array can contain an object.

true

Selected Answer:

Here are three variables about the same person:

var name = "Sara";

var favFood = "eggs";

var age = 22;

Create an object, called Sara, to store each of those variables.

Display each value, by referring to the object, in two sentences, on separate lines.

They should look like this:

Sara is 22 years old.

Sara's favorite food is eggs.

var Sara = {

name: "Sara",

favFood:  "eggs",

age:  22

};

fill(255,0,0);

text(Sara.name + " is " + Sara.age + " years old.", 20, 20);

text(Sara.name + "'s favorite food " + " is " + Sara.favFood, 20, 40);