Chapter 4 Key Terms

Question 1

Break mode

Answer 1

The temporary suspension of program execution in a browser so the programmer can monitor values and trace program execution.

Question 2

Breakpoint

Answer 2

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

Question 3

Bug

Answer 3

Any error in a program that causes it to function incorrectly, whether because of incorrect syntax or flaws in logic.

Question 4

Bulletproofing

Answer 4

Writing code that anticipates and handles potential problems.

Question 5

Call Stack

Answer 5

The ordered list maintained by a JavaScript processor containing all the procedures, such as functions, methods, or event handlers, that have been called but have not yet finished processing.

Question 6

Commenting out

Answer 6

A debugging technique in which program errors are located by changing potentially incorrect program code to comments.

Question 7

Debugging

Answer 7

The act of tracing and resolving program errors.

Question 8

Dependencies

Answer 8

The relationships that exist when statements depend on the successful execution of other statements or functions.

Question 9

Driver program

Answer 9

A simplified, temporary program that is used for testing functions and other code.

Question 10

Event Listener breakpoint

Answer 10

A breakpoint that is activated when an event occurs within the web page or browser.

Question 11

Exception

Answer 11

An error that occurs in the execution of a program.

Question 12

Exception handling

Answer 12

A method of bulletproofing code that allows a program to handle errors as they occur in the execution of the program.

Question 13

Linting

Answer 13

The process of running code through a program that flags common issues that may affect code quality and performance.

Question 14

Load-time error

Answer 14

An error that occurs when the program is initially loaded by the browser.

Question 15

Logging

Answer 15

A debugging technique that involves writing values directly to the browser console.

Question 16

Logic

Answer 16

The order in which various parts of a program run, or execute.

Question 17

Logic error

Answer 17

A flaw in a program’s design that prevents the program from running as anticipated.

Question 18

Runtime error

Answer 18

An error that occurs when a JavaScript interpreter encounters a problem while a program is executing.

Question 19

Scope window

Answer 19

A section of the browser debugger pane that lists all local and global variables and objects available to the program and their current values.

Question 20

Step in

Answer 20

The stepping option that executes an individual line of code and then pauses until instructed to continue; also known as step into.

Question 21

Step into

Answer 21

The stepping option that executes an individual line of code and then pauses until instructed to continue; also known as step into.

Question 22

Step out

Answer 22

The stepping option that executes all remaining code in the current function.

Question 23

Step over

Answer 23

The stepping option to skip function calls; the program still executes each function stepped over, but appearing in the debugger as if a single statement executes.

Question 24

Stepping options

Answer 24

Options in browser debugging tools to continue program execution after program breaks.

Question 25

Strict mode

Answer 25

A JavaScript processing mode in which adherence to JavaScript syntax is strictly enforced.

Question 26

Syntax

Answer 26

the arrangement of words and phrases.

Question 27

Syntax error

Answer 27

An error that occurs when an interpreter fails to recognize code, such as a statement that is not recognized by a browser’s scripting engine.

Question 28

Throw

Answer 28

A JavaScript statement used to trigger an error event.

Question 29

Tracing

Answer 29

A debugging technique that involves examining individual statements in an executing program.

Question 30

User error

Answer 30

An error initiated by the user through operating the program in a way not intended by the developer.

Question 31

Watch window

Answer 31

A section of the debugger pane used for tracking the changing values of a variable or expression