Section 1
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Which of the following is an illegal array initialization statement?
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Cards (59)
Section 1
(50 cards)
Which of the following is an illegal array initialization statement?
var n[ 10, 20, 30, 40, 50 ];
What does the variable string contain after the following code is executed? var string = "Good luck on the test"; string = string.charAt( 3 );
d
The style of programming in which the user interacts with a GUI component is called ________ programming.
event-driven
Which of the following is not a global function?
square
What is the result of writing the keyword var in a function parameter list?
The result would be a JavaScript runtime error
A function's ________ are also considered to be local variables.
parameters
Which of the following is the proper method to dynamically allocate memory to an array of 100 elements?
var c = new Array( 100 );
Which of the following are valid names of scopes in JavaScript?
Both local and global
What will the browser display if the following script is executed? <script type = "text/javascript"> <!-- var theArray = [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]; modifyArray( theArray[ 3 ] ); document.write( theArray.join( " " ) ); function modifyArray( i ) { i = 11; } //--> </script>
1 2 3 4 5 6 7 8 9
What does the following statement do? Math.floor( Math.random() * 12 );
This creates a random number from 0 up to but not including 12
In JavaScript, all objects and arrays are passed to functions by ________.
reference
Which of the following methods would you use to search a string for a specific character?
charAt
Which of the following is a legal function call for the function definition provided below? function square( y ) { return y * y; }
square (7+2);
Pass-by- ________ is the method of passing a copy of the argument's value to a function.
value
Functions that are not provided as part of the JavaScript language are called ____ functions.
programmer-defined
What would the browser output if the following script is executed? <script type = "text/javascript"> <!-- var array = [ [ 1, 2, 3 ], [ 1, 2, 3 ] ]; for ( var i in array ) { for ( var j in array[ i ] ) document.write( array[ i ][ j ] + " " ); document.writeln("<br />"); } //--> </script>
1 2 3 1 2 3
Change an image's ________ attribute to change which picture it displays.
src
What does the variable string contain after the following code is executed? var string = "Good luck on the test"; string = string.split( " " );
an array containing the strings "Good", "luck", "on", "the" and "test"
Nested in the audio element are two ________ specifying the locations of the audio clip in MP3 and OGG formats, respectively.
sources elements
Iteration uses ________ statements and recursion uses ________ statements.
repetition, selection
A function that calls itself either directly or indirectly through another function is called a ________ function.
recursive
Giving a local function variable the same name as a global variable will result in which of the following?
The local variable will "hide" the global variable.
The technique of developing and maintaining a large program by constructing it from small, simple pieces is called ________.
divide and conquer
An object's methods are accessed by writing the name of the object immediately followed by a ________.
dot
Which of the following is a mathematical constant?
Math.LN10
Which of the following is the proper method to access the length of the array arr?
arr.length
When does a recursive program go into infinite recursion?
if the recursion step does not converge on the base case
What would the function cube return, assuming it is called with the statement cube( 3 )? function cube( y ); { return y y y; }
JavaScript runtime error
What is the effect of the join statement in the following code? var theArray1 = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]; var theArray2 = [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]; var value = theArray1.join( " " );
The join method will create a string from the values in theArray1
What is the value of s3 after the following code is executed? var s1 = "one"; var s2 = "two"; var s3 = "three"; s1.concat( s2 ); s3 = s1;
onetwo
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?
game.point.value = "10"
By default, the JavaScript sort method uses ________ to sort the array passed to it.
string comparison
The value a in the following statement is called the ________ and the value b is called the ________. face = Math.floor( a + Math.random() * b );
shifting value, scaling factor
_________ are data structures consisting of related data items (sometimes called collections of data items).
arrays
Which of the following is used to access members (or properties) of form elements?
.
The first statement below ________ the array while the second statement ________ the array. var c; c = new Array( 12 );
declares, allocates
When working with data stored in arrays, it's often necessary to determine whether an array contains a value that matches a certain ________.
key value
What does the variable string contain after the following code is executed? var string = "Good luck on the test"; string = string.link("www.deitel.com");
a link to www.deitel.com with the text "Good luck on the test"
When a function invokes a new copy of itself, it is called a ________.
recursive call
The best way to develop and maintain a large program is to construct it from small, simple pieces called ________.
modules
The "prepackaged" functions that belong to JavaScript objects such as Math.pow and Math.round are often called ________.
methods
All variables declared in function definitions are ________.
local variables
Pass-by- ________ is the method of passing the argument's address in memory to a function.
reference
To refer to a particular location or element in the array, we specify the name of the array and the ________ of the particular element in the array.
position number
The sort method can be given a function to use for the comparisons it makes, called a(n) ________ function.
comparator
What is the value of num assuming that all 12 elements of array test are initialized to 3? ++test[ 7 ]; var num = test[ 7 ];
4
What does the following code do? for ( var col = 0; col < a[ 2 ].length; ++col ) a[ 2 ][ col ] = 0;
Sets all the elements in row 2 to zero
What is the value of s1 after the following code is executed? var s1 = "deitel and associates"; s1 = s1.slice( 6 );
and associates
In JavaScript, numbers and boolean values are passed to functions by ________.
value
JavaScript references the ________ object for you when you call its functions, so you don't need to use it directly.
global
Section 2
(9 cards)