Deck 10: Exploring Arrays, loops, and Conditional Statements

Question 1

Statement labels are used to identify statements in JavaScript code so that the statements can be referenced elsewhere in a program.

Answer 1

True

Question 2

When each entry in an array matches the entry in another array,it is called a linear array.

Answer 2

False

Question 3

In an array literal,the array values are a space-separated list within a set of curly brackets.

Answer 3

False

Question 4

Index values start with 1 so that the initial item in an array has an index value of 1,the second item has an index value of 2,and so on.

Question 5

The break statement runs a command or a command block only if the conditional expression returns the value true; it does nothing if the condition is false.

Question 6

The do/while loop is generally used when the program loop should run at least once before testing for the stopping condition.

Question 7

A calendar that is created as a web table can have class and ID designations to make it easy for page developers to assign different styles to different parts of the calendar.

Question 8

In an if loop,a variable known as a counter variable is used to track the number of times a block of commands is run.

Question 9

Increasing the value of the length property adds more items to an array,but the items have null values until they are defined.

Question 10

JavaScript supports logical operators that connect several expressions.

Question 11

The appearance of any form element can be changed by modifying style sheets instead of the JavaScript code.

Question 12

The every(callback [,thisArg])array method applies the callback function to each item in an array.

Question 13

The value of the length property can be reduced without removing items from an array.

Question 14

By default,items are placed in an array either in the order in which they are defined or explicitly by index number.

Question 15

The getDate()method in a calendar app returns an integer ranging from 0 (Sunday)to 6 (Saturday).

Question 16

When a pass statement is encountered,control is passed to the statement immediately following it.

Question 17

A command block is indicated by its opening and closing square brackets [ ].

Question 18

The map(callback [,thisArg])method returns the index of the first element in the array that passes a test in the callback function.

Question 19

The slice()method reverses the order of items in an array,making the last items first and the first items last.

Question 20

The while statement is used to exit a program loop before the stopping condition is met.

Question 21

What is the output of the following code?
Var x = ["a","b","c"];
X)push("d","e");
X)pop();
X)pop();

A) ​x = ["a","b","c"]
B) ​x = ["a","b","d","e"]
C) ​x = ["d","e"]
D) ​x = ["c","d","e"]

Question 22

Identify the general syntax of the do/while loop.

A) do (continue){
Commands
}
While (continue){
Commands
}
B) while (continue){
Commands
}
Do (continue){
Commands
}
C) while {
Commands
}
Do (continue);
D) do {
Commands
}
While (continue);

Question 23

Identify the general structure of a for loop.

A) for (start;continue;update)
{
Commands
}
B) ​for (start;update)
{
Commands
}
C) ​for (start;stop)
{
Commands
}
D) ​for (start;stop;continue)
{
Commands
}

Question 24

Which of the following determines the current size of an array?

A) ​array(length)
B) ​array[length]
C) ​array.length
D) ​array::length

Question 25

Identify a method that is used to create a subarray.

A) ​concat()
B) ​slice()
C) ​assert()
D) ​sort()

Question 26

Numeric data can be sorted by creating a(n)_____ function that contrasts the values of two adjacent array items.

A) ​sum
B) ​iteration
C) ​assert
D) ​compare

Question 27

Identify the syntax of the while loop.

A) while (continue){
Commands
}
B) while (start){
Commands
}
C) while [start;stop] {
Commands
}
D) while [update;continue] {
Commands
}

Question 28

A _____,which employs the first-in-first-out (FIFO)principle in which the first item added to the data list is the first removed,is similar to a stack.

A) ​frame
B) ​bitmap
C) ​queue
D) ​binary tree

Question 29

What is the output of the following code?
For (var i = 0; i < = 360; i+=60)

A) ​i = 0,60,120,180,240,360
B) ​i = 360,240,180,120,60,0
C) ​i = 60,120,240,480,960
D) ​i = 600,300,240,180,120,60

Question 30

Identify a method that inserts new items at the front of an array.

A) ​reverse()
B) ​unshift()
C) ​assert()
D) ​sort()

Question 31

The _____ loop tests the condition to continue the loop right after the latest command block is run.

A) ​do/while
B) ​while
C) ​for
D) ​forEach

Question 32

Identify the output of the following code.
Var x = [3,45,1234,24];
X)sort();

A) ​1234,24,3,45
B) ​3,24,45,1234
C) ​1234,45,24,3
D) ​1234,24,45

Question 33

Identify a compare function that sorts numeric values in ascending order.

A) ​function ascending(a,b){
Return a - b;
}
B) ​function ascending(b,a){
Return a;
}
C) ​function ascending(a,b){
Return b - a;
}
D) ​function ascending(b,a){
Return b;
}

Question 34

Identify the expression used to reference array values.

A) ​array()
B) ​array[i]
C) ​array{array1,array2,…}
D) ​array::values

Question 35

Which of the following examples tests whether x is equal to 5 or y is equal to 8?

A) ​(x === 5)&& (y === 8)
B) ​(x === 5): (y === 8)
C) ​(x === 5)|| (y === 8)
D) ​(x === 5)/ (y === 8)

Question 36

For array data that should be treated as a queue,the _____ method is used,which is similar to the pop()method except that it removes the first array item and not the last.

A) ​reverse()
B) ​shift()
C) ​assert()
D) ​sort()

Question 37

Identify a compare function that sorts numeric values in descending order.

A) function descending(a,b){
Return a - b;
}
B) function descending(b,a){
Return b;
}
​
C) function descending(a,b){
Return b - a;
}
D) function descending(b,a){
Return a;
}

Question 38

The _____ operator tests whether two items are equal in value and have the same data type.

A) ​= =
B) ​= = =
C) ​=
D) ​!=

Question 39

A(n)_____ is a collection of values organized under a single name.

A) ​index
B) ​heap
C) ​array
D) ​tuple

Question 40

What is the output of the following code?
For(var i = 5; i > 0; i--)

A) ​i = 4,3,2,1,0
B) ​i = 5,4,3,2,1
C) ​i = 0,1,2,3,4
D) ​i = 1,2,3,4,5

Question 41

The _____ method creates a new array by passing the original array items to the callback function,which returns the equivalent value of the array items.

A) ​array.every(callback [,thisArg])
B) ​array.map(callback [,thisArg])
C) ​array.some(callback [,thisArg])
D) ​array.find(callback [,thisArg])

Question 42

Identify a true statement of array.some(callback [,thisArg])method.

A) ​It tests whether the condition returned by the callback function holds for at least one item in array.
B) ​It returns the value of the first element in the array that passes a test in the callback function.
C) ​It tests whether the condition returned by the callback function holds for all items in array.
D) ​It returns the index of the first element in the array that passes a test in the callback function.

Question 43

The _____ method diminishes array from the last element by keeping only those items that return a value of true from the callback function.

A) ​array.every(callback [,thisArg])
B) ​array.map(callback [,thisArg])
C) ​array.reduceRight(callback [,thisArg])
D) ​array.findIndex(callback [,thisArg])

Question 44

Identify the expression in which the initial value of the day variable will be set to match the first day of the calendar month.

A) ​var day = Date(calDate(),calDate.getDay(),1);
B) ​var day = new Day(calDate.getDD(),calDate.getMM(),calDate.getYY(),1);
C) ​var day = new Day(calDay.getFullMonth(),calDay.getDate(),1);
D) ​var day = new Date(calDate.getFullYear(),calDate.getMonth(),1);

Question 45

The _____ method performs an action similar to the forEach()method except that the function it calls returns a value that can be used to match the contents of an existing array into a new array.

A) ​sort()
B) ​map()
C) ​splice()
D) ​find()

Question 46

Which of the following statements is used to terminate any program loop or conditional statement?

A) ​for
B) ​while
C) ​pass
D) ​break

Question 47

Identify the general syntax of the forEach method.

A) array.forEach [,thisArg](){
Commands
}
B) ​array.forEach(callback [,thisArg])
C) array.forEach (value){
Commands
}
D) ​array.forEach(callback [value])

Question 48

What is the output of the following code?
Var scores = [92,68,83,95,91,65,77];
Var highScores = scores.filter(gradeA);
Function gradeA(value){
Return value > 90;
}

A) ​[92,95,91]
B) ​[96,97,98]
C) ​[68,83,65,77]
D) ​[91,92,65,68,77,83]

Question 49

What is the output of the following code?
Var x = [4,7,11];
X)forEach(stepUp);
Function stepUp(value,i,arr){
Arr[i] = value + 1;
}

A) ​4,7,11
B) ​3,7,11
C) ​5,8,12
D) ​8,14,22

Question 50

Which of the following methods is used to determine the day of the week on which a month starts?

A) ​calDay;
B) ​day.calDay()
C) ​find.Day;
D) ​getDay()

Question 51

Identify a method that tests whether the condition returned by the callback function holds for all items in an array.

A) ​array.every(callback [,thisArg])
B) ​array.filter(callback [,thisArg])
C) ​array.some(callback [,thisArg])
D) ​array.find(callback [,thisArg])

Question 52

What is the output of the following code?
Var sum = 0;
Var x = [1,3,7,11];
X)forEach(sumArray);
Function sumArray(value){
Sum += value;
}

A) ​0
B) ​231
C) ​11
D) ​22

Question 53

Identify a true statement of array.find(callback [,thisArg])method.

A) ​It tests whether the condition returned by the callback function holds for at least one item in array.
B) ​It returns the value of the first element in the array that passes a test in the callback function.
C) ​It tests whether the condition returned by the callback function holds for all items in array.
D) ​It returns the index of the first element in the array that passes a test in the callback function.

Question 54

Identify a method that decreases array by keeping only those items that return a value of true from the callback function.

A) ​array.every(callback [,thisArg])
B) ​array.map(callback [,thisArg])
C) ​array.reduce(callback [,thisArg])
D) ​array.find(callback [,thisArg])

Question 55

Which of the following functions increases the value of each item in an array by 1?

A) ​sum()
B) ​AddArray()
C) ​StepUp()
D) ​ceil()

Question 56

Which of the following values will the expression 15 % 4 return?

A) ​1
B) ​11
C) ​3
D) ​60

Question 57

Identify the structure of an if statement

A) if (condition){
Commands
}
B) ​if {
}(condition)
C) if {
Commands
}
D) ​if {
}
(condition){
Commands

Question 58

Identify the general structure for accessing each value from an array using a for loop.

A) ​for (i < array; i++){
Commands involving array[i]
}
B) for (var i = 0; i++; i < array.length){
Commands involving array(i)
}
C) for (var i = 0; i++){
Commands involving array(i)
}
D) for (var i = 0; i < array.length; i++){
Commands involving array[i]
}

Question 59

Identify a method that extracts array items that match a specified condition.

A) ​sort()
B) ​filter()
C) ​splice()
D) ​reverse()

Question 60

Which of the following methods creates a new array populated with the elements of array that return a value of true from the callback function?

A) ​array.every(callback [,thisArg])
B) ​array.filter(callback [,thisArg])
C) ​array.some(callback [,thisArg])
D) ​array.find(callback [,thisArg])

Question 61

Melissa, a computer science engineering student, is learning the basics of programming by exploring arrays. She learns about different array methods. She wishes to learn more on inserting and deleting array items. She creates monthName array to extract only the three spring months—March, April, and May—from a calendar.

-Melissa wants to insert abbreviations of spring months into the monthName array.Which of the following methods should she use?

A) monthName.reverse(5,3,"Mar","Apr","May");
B) monthName.sort(2,3,"Mar","Apr","May");
C) monthName.join(5,3,"Mar","Apr","May");
D) monthName.splice(2,3,"Mar","Apr","May");

Question 62

Identify the letter of the choice that best matches the phrase or definition.

-This method inverts the order of items in an array.

A) array.unshift(values)
B) array.toString()
C) pop()
D) concat(array1,array2,...)
E) sort()
F) copyWithin(target,start[,end])
G) join(separator)
H) shift()
I) reverse()
J)push(values)

Question 63

JavaScript allows for the creation of _________,in which some array values are undefined.

Question 64

A _________ is an operator that compares the value of one expression to another returning a Boolean value indicating whether the comparison is true or not.

Question 65

The collection of commands that is run each time through a loop is known collectively as a _________.

Question 66

Gregor, a software developer, is developing a calendar application. He has to use several if conditional statements to ensure that the calendar displays the exact number of days present in each month of each year. He creates a dayCount array to keep track of the number of days in each month.

-Gregor wants to ensure February contains 29 days only in the year 2020 as it is a leap year.Which of the following should Gregor use to set the value in the dayCount array?

A) if (thisYear === 2020){
DayCount[1] = 29;
}
B) if (dayCount=29)
{
2020;
}
C) if {
ThisYear = 2020;
DayCount[1] == 29;
}
D) if {
DayCount=29 && this year=2020;
}

Question 67

_________ is a number associated with each individual value in an array and distinguishes each value from other values in the array.

Question 68

The _____ statement stops processing the commands in the current iteration of the loop and proceeds to the next iteration instead of stopping the program loop altogether.

A) ​switch
B) ​else
C) ​continue
D) ​pass

Question 69

Melissa, a computer science engineering student, is learning the basics of programming by exploring arrays. She learns about different array methods. She wishes to learn more on inserting and deleting array items. She creates monthName array to extract only the three spring months—March, April, and May—from a calendar.

-Melissa wants to remove spring months from the monthName array.Which of the following methods should Melissa use?

A) springMonths = monthName.slice(2,5);
B) springMonths = monthName.splice(2,3);
C) springMonths = monthName.slice(3,5);
D) springMonths = monthName.splice(5,3);

Question 70

A _________ is a set of commands executed repeatedly until a stopping condition is met.

Question 71

Identify the letter of the choice that best matches the phrase or definition.

-This method appends an array with new items.

A) array.unshift(values)
B) array.toString()
C) pop()
D) concat(array1,array2,...)
E) sort()
F) copyWithin(target,start[,end])
G) join(separator)
H) shift()
I) reverse()
J)push(values)

Question 72

Gregor, a software developer, is developing a calendar application. He has to use several if conditional statements to ensure that the calendar displays the exact number of days present in each month of each year. He creates a dayCount array to keep track of the number of days in each month.

-Gregor wants to create a condition to ensure that all the years divisible by 4 should contain 29 days in February.Which of the following statements should he use?

A) if (thisYear % 4 === 0){
DayCount[1] = 29;
}
B) if (this year/4 === 0){
DayCount[2] = 29;
}
C) if (this year*4==0){
DayCount[1] = 29
}
D) if (thisYear % 4 < = 29){
DayCount[2] = 29;
}

Question 73

_________ is a section of an array.

Question 74

A _________ is a statement that runs a command or command block only when certain circumstances are met.

Question 75

A stack data structure employs the _________ principle in which the last items added to the stack are the first ones removed.

Question 76

Identify the letter of the choice that best matches the phrase or definition.

-This method removes the last item from an array.

A) array.unshift(values)
B) array.toString()
C) pop()
D) concat(array1,array2,...)
E) sort()
F) copyWithin(target,start[,end])
G) join(separator)
H) shift()
I) reverse()
J)push(values)

Question 77

Identify the syntax of the statement label.

A) ​label = {statements}
B) ​statement!(label)
C) ​label: statements
D) ​statements.label

Question 78

Arrays can be used to store information in a data structure known as a _________ in which new items are added to the top or to the end of the array.

Question 79

The _________ returns the integer remainder after dividing one integer by another.

Question 80

Melissa, a computer science engineering student, is learning the basics of programming by exploring arrays. She learns about different array methods. She wishes to learn more on inserting and deleting array items. She creates monthName array to extract only the three spring months—March, April, and May—from a calendar.

-Melissa wants to extract the spring months and store them in the monthName array.Identify a method Melissa should choose to perform this task.

A) springMonths = monthName.slice(2,5);
B) springMonths = monthName.splice(2,3);
C) springMonths = monthName.slice(3,5);
D) springMonths = monthName.splice(5,3);