Deck 4: Debugging and Error Handling

Question 1

Syntax refers to the order in which various parts of a program run, or execute.

Answer 1

False

Question 2

You log values to the console using the window.alert()method.

Answer 2

False

Question 3

You enclose code that may contain an exception in a ____ statement.

A) throw
B) catch
C) throws
D) try

Answer 3

D

Question 4

For each error encountered, a browser's console displays a line numberand a description of the error.

Question 5

A program's ____  is the order in which various parts of the program run, or execute.

A)logic
B)syntax
C)call stack
D)console

Question 6

The window.alert()debugging methodresults in messages ____ .

A)written to the text of the document being debugged
B)displayed in dialog boxes
C)displayed in the browser console
D)available only to the JavaScript processor

Question 7

A breakpoint  is a designation added to a specific statement in a program that causes  program execution to pause when it reaches that statement.

Question 8

The console.log()debugging methodresults in messages ____ .

A)written to the text of the document being debugged
B)displayed in dialog boxes
C)displayed in the browser console
D)available only to the JavaScript processor

Question 9

The ____ is the ordered list maintained by a JavaScript processor containing all the procedures that have been called but have not yet finished processing.

A) call queue
B) call heap
C) call stack
D) methods list

Question 10

The rules of a programming language are known as its ____.

A)logic
B)syntax
C)call stack
D)console

Question 11

A ____ error is a flaw in a program's design that prevents the program from running as you anticipate.

A) compile-time
B) syntax
C) logic
D) run-time

Question 12

After you throw an error, you use a ____ statement to handle the error.

A) try
B) catch
C) handle
D) capture

Question 13

A ____ error occurs when the interpreter fails to recognize code.

A) logic
B) syntax
C) web
D) run-time

Question 14

____ allows programs to handle errors as they occur in the execution of a program.

A) Error coding
B) Form validation
C) Input validation
D) Exception handling

Question 15

Each time a program calls a procedure, the procedure is added to the top of the call stack, and then removed after it finishes executing.

Question 16

When using the  console.log() method to trace bugs, it can be helpful to use a ____ program.

A) script
B) hub
C) tracing
D) driver

Question 17

The debugging tools built into modern browsers are especially useful in tracking down ____ .

A)compile-time errors
B)syntax errors
C)run-time errors
D)logic errors

Question 18

____ is the temporary suspension of program execution so you can monitor values and trace program execution.

A)The call stack
B)Break mode
C)Debugging
D)Tracing

Question 19

A ____ error occurs when the JavaScript interpreter encounters a problem while a program is executing.

A) run-time
B) syntax
C) logic
D) browser

Question 20

You use a ____ statement within a try block to specify an error message .

A) catch
B) call
C) throw
D) throws

Question 21

____________________ is the process of tracing and resolving errors in a program.

Question 22

Writing values directly to the console is known as ____.

A)logging
B)writing
C)stepping out
D)breaking

Question 23

You implement custom error handling using the ____________________ event.

Question 24

The term ____________________ refers to the temporary suspension of program execution so that you can monitor values and trace program execution.

Question 26

What is the difference between syntax errors and run-time errors?

Question 27

Name two tools you can use to analyze your HTML code for errors, and describe how to use them for this task.

Question 28

An infinite loop is an example of a(n)____ error.

A)syntax
B)run-time
C)logic
D)user

Question 29

After you evaluate code for exceptions, you can use a ____ statement to perform cleanup or necessary tasks.

A) try
B) throw
C) catch
D) finally

Question 30

Which of the following JavaScript statements requests that processors remove some features from the language and require more stringent syntax for other features?

A) break;
B)"use strict";
C) debugger;
D) console.log();

Question 31

Explain the three stepping options found in the debugging tools in modern browsers.

Question 32

Explain how strict mode can be useful in debugging.

Question 33

____________________ is the examination of individual statements in an executing program.

Question 34

What is the difference between a variables list and a watch list in browser debugging tools?

Question 35

Describe two advantages of implementing custom error handling.

Question 36

What is a dependency and what role do dependencies play in debugging?

Question 37

Explain how access to the call stack is useful in debugging.

Question 38

Briefly explain how to use comments to locate bugs with JavaScript.

Question 39

Which of the following JavaScript statements works like a breakpoint?

A) break;
B)"use strict";
C) debugger;
D) console.log();

Question 40

In ____________________ mode, some features are removed from the language, while other features require more stringent syntax.

Question 41

How is setting breakpoints useful in debugging?