Deck 9: Javascript: Functions

Question 1

Functions that are not provided as part of the JavaScript language are called ________ functions.

A) add-on
B) programmer-defined
C) man-made
D) extra

Answer 1

B

Question 2

The value a in the following statement is called the ________ and the value b is called the ________.
Face = Math.floor( a + Math.random() * b );

A) scaling factor, shifting value
B) shifting value, scaling factor
C) scaling value, shifting factor
D) shifting factor, scaling value

Answer 2

B

Question 3

The "prepackaged" functions that belong to JavaScript objects such as Math.pow and Math.round are often called ________.

A) subroutines
B) routines
C) methods
D) functions

Answer 3

C

Question 4

The best way to develop and maintain a large program is to construct it from small, simple pieces called ________.

A) scripts
B) modules
C) scriptlets
D) objects

Question 5

Which of the following is used to access members (or properties) of form elements

A) *
B) ,
C) )
D) ;

Question 6

If the HTML5 form game has a text field named point in it, what is the proper way to set the text associated with point to 10

A) game.point = "10"
B) game.point.text = "10"
C) game.point.caption = "10"
D) game.point.value = "10"

Question 7

The technique of developing and maintaining a large program by constructing it from small, simple pieces is called ________.

A) divide and conquer
B) modular programming
C) multitasking
D) multiprogramming

Question 8

The style of programming in which the user interacts with a GUI component is called ________ programming.

A) object-oriented
B) automatic
C) event-driven
D) modular

Question 9

Which of the following is not a global function

A) parseInt
B) escape
C) square
D) eval

Question 10

Nested in the audio element are two ________ specifying the locations of the audio clip in MP3 and OGG formats, respectively.

A) source elements
B) media elements
C) preload attributes
D) location elements

Question 11

JavaScript references the ________ object for you when you call its functions, so you don't need to use it directly.

A) document
B) local
C) scriptlevel
D) Global

Question 12

All variables declared in function definitions are ________.

A) global variables
B) local variables
C) static variables
D) constant variables

Question 13

Which of the following is a legal function call for the function definition provided below
Function square( y )
{
Return y * y;
}

A) square(7+2);
B) (7).square;
C) square(7,2);
D) square 7;

Question 14

Change an image's ________ attribute to change which picture it displays.

A) location
B) URL
C) src
D) source

Question 15

Which of the following are valid names of scopes in JavaScript

A) local
B) global
C) variable
D) Both (a) and (b)

Question 16

What is the result of writing the keyword var in a function parameter list

A) The result would be a JavaScript runtime error.
B) The parameter following the keyword would have global scope.
C) The parameter following the keyword would have local scope.
D) The parameter following the keyword would become a static variable.

Question 17

A function's ________ are also considered to be local variables.

A) parameters
B) static variables
C) register variabless
D) constant variables

Question 18

Giving a local function variable the same name as a global variable will result in which of the following

A) JavaScript runtime error.
B) Data corruption.
C) The local function variable will rename itself.
D) The local variable will "hide" the global variable.

Question 19

What does the following statement do
Math.floor( Math.random() * 12 );

A) This creates a random number from 0 up to and including 12.
B) This creates a random number from 0 up to but not including 12.
C) This creates a random number from 1 up to and including 12.
D) This creates a random number from 1 up to but not including 12.

Question 20

What would the function cube return, assuming it is called with the statement cube( 3 )
Function cube( y );
{
Return y * y * y;
}

A) JavaScript runtime error
B) 3
C) 9
D) 27

Question 21

Iteration uses ________ statements and recursion uses ________ statements.

A) counter-recursive, counter-iterative
B) repetition, function calling
C) repetition, selection
D) function-calling, repetition

Question 22

A function that calls itself either directly or indirectly through another function is called a ________ function.

A) base case
B) iterative
C) recursive
D) fibonacci

Question 23

When does a recursive program go into infinite recursion

A) if the loop-continuation test never becomes false
B) if the recursion test never becomes false
C) if the loop-continuation test never becomes true
D) if the recursion step does not converge on the base case

Question 24

When a function invokes a new copy of itself, it is called a ________.

A) base case
B) final step
C) base case
D) recursive call