Controlling Program Flow in JavaScript (Quiz)

Which of the following examples demonstrates correct syntax for a JavaScript if... else if ...else statement?

(NO ANSWER IS PROVIDED)

Which type of statement provides a way to exit a loop that would otherwise continue to execute?

The break statement

Question 6 : Consider the following code: for (x; y; z) { //one or more statements } What does x represent in this code?

The loop counter variable

The continue statement can be used only:

within a for loop or a while loop.

Question 20 : Consider the following code: var x = 0; do { document.write(x + " "); } while (x > 10) How many times will the code inside the curly brackets execute?

1 time

Consider the following code: for (var x = 0; x < 26; x+=5) { if (x == 10) continue; document.write(x + "<br/>"); } How many lines will this statement output to the document?

5 lines

Consider the following code: for (var x = 0; x < 26; x+=5) { document.write(x + "<br/>"); } How many lines will this statement output to the document?

6 lines

Question 25 : Which of the following is true about control structures?

Control structures make desicions based on Boolean values.

Consider the following code: var x = 0; while (x < 10){ document.write(x); } How many times will this statement execute?

Infinitely, until the browser is closed

What is the purpose of the do...while statement?

It executes the code once, then checks to see if the condition is true and continues to execute the code for as long as a condition is true.

Which JavaScript statement is used to force the flow of control back to the top of a loop?

The continue statement

Which JavaScript statement should you use to repeat a group of statements for some particular range of values?

The continue statement

How does the do...while statement differ from the while statement?

The do...while statement guarantees that the code within the curly braces will execute at least once, whereas the while statement does not.

Which JavaScript statement should you use to test for a single condition and branch to a process?

The if statement

Question 24 : Consider the following code: for (var x = 0; x < 26; x+=5) { document.write(x + " "); if (x == 10) break; } What will be the last number printed to the document?

The last number will be: 10

You are developing an application for enrollment in a grade school. You have included a variable for the grade level, and you want to assign a default value based on the age of the applicant. Which control structure will allow you to accomplish this in the most efficient way?

The switch statement

Consider the following code: var x = 100; while (x > 5) { x--; } What will be the value of x after execution?

The value will be: 5

Consider the following code: var userName = prompt("Enter User Name",""); var accessLevel = "None"; if (userName == "Admin") { accessLevel = "Full"; } else { accessLevel="Limited" } What will be the value of the accessLevel variable after execution if the user enters John as the user name?

The value will be: Limited

Consider the following code: var myVar = isNaN("One"); What will be the value of myVar after execution of this code?

The value will be: true

What is the purpose of the switch statement?

To compare a value against other values, searching for a match

What is the purpose of the while statement?

To execute a block of code for as long as a condition is true

Controlling Program Flow in JavaScript

To repeat a group of statements for some particular range of values

Consider the following code: var season = 5; var seasonName = "Summer"; switch (season) { case(1): seasonName = "Winter"; break; case(2): seasonName = "Spring"; break; case(3): seasonName = "Summer"; break; case(4): seasonName = "Fall"; break; default: seasonName = "Unknown"; } What is the value of seasonName after execution?

Unknown

Which code will display an alert if the variable timerMinutes has a value 10?

if (timerMinutes == 10) alert("Time Expired!");

Which of the following demonstrates the correct general syntax for a while statement?

while (boolean expression) { //statements to execute }