Storing and Tracking Information with Variables

Question 1

• Create a variable named myName.
• Assign your name (as a string) to the myName variable.

Answer 1

var myName = “Randy”;

Question 2

Variables can only contain what characters?

Answer 2

• letters
• numbers
• $
• _

Question 3

Finish the code below to create a variable named shipsLeft containing the number 10.

_____ shipsLeft = 10;

Answer 3

var

Question 4

Complete the code below to create a variable named timeRemaining (don’t put anything in the variable).

var _____ ;

Answer 4

timeRemaining

Question 5

What creates a variable named playerName and stores the name “Shawna” in it?

Answer 5

var playerName = “Shawna”;

Question 6

• Create a player variable with the string ‘Jasmine’ in it.
• Use the document.write() function to print the contents of the player variable to the page.

Answer 6

var player = “Jasmine”;

document.write(player);

Question 7

In the code below there are too many single quote marks. Add the character that “escapes” the second single quote and tells the browser to treat that quote as just a regular character:

var text = ‘She_____’s the best!’;

Answer 7

\

Question 8

• Create a variable named answer.
• Use the prompt() method to ask the user “What day is it?” and store the result in the answervariable.
• Use the document.write() method to write the variable answer to the page.

Answer 8

var answer = prompt("What day is it?");
document.write(answer)

Question 9

• Create a variable named firstName and put your first name in the variable.
• Create another variable named lastName and put your last name in it.
• Create a variable named fullName that combines both the first and last name variables to create a string like “Mary Jones”.

Answer 9

var firstName = “Randy”;

var lastName = “Reyes”;

var fullName = firstName + “ “ + lastName;

Question 10

Complete the code below to create a new variable named message containing the string “JavaScript”

var _____ = _____ + ‘Script’;

Answer 10

message, “Java”

Question 11

What tells a browser to open a dialog box for collecting a response with the message “Type your name” in it?

Answer 11

prompt(‘Type your name’);

Question 12

The process of combining one or more strings is called:

Answer 12

concatenation

Question 13

What produces the same result as this code:

var greeting = ‘Hi’; greeting = greeting + ‘ there!’;

Answer 13

var greeting = ‘Hi’;

greeting += ‘ there!’;

Question 14

• Assign an all uppercase version of the id variable to the userName variable.
• Complete the assignment to the userName variable by adding a # symbol followed by an all uppercase version of the lastName variable. In other words, using string concatenation so that the final value of userName is “23188XTR#SMITH”.

var id = "23188xtr";
var lastName = "Smith";

var userName

Answer 14

var id = "23188xtr";
var lastName = "Smith";

var userName = id.toUpperCase();
userName += "#" + lastName.toUpperCase();

Question 15

Given the following code, what statement opens an alert dialog with the contents of the variable message in all lowercase:

var message = “Kenneth and Andrew love to play Uno.”

Answer 15

alert( message.toLowerCase() );

Question 16

Complete the code below to store the value 100 in the variable named score

var score = _____

Answer 16

100