Question 1

Languages in which arrays are objects, including JavaScript, implement a two-dimensional array as an array of arrays, so separate brackets must be used for the subscripts.

Accepted Answer

In languages like JavaScript, where arrays are treated as objects, a two-dimensional array is indeed implemented as an array of arrays. This means that to access elements, separate brackets are used for each level of the array (e.g., array[i][j] for the element in the ith row and jth column).

Question 2

In JavaScript, two-dimensional arrays are implemented by making each array element contain an array object of its own.

Accepted Answer

In JavaScript, a two-dimensional array is created by defining an array, where each element of this array is also an array, thus allowing for a grid-like structure.

Question 3

A one-dimensional array in JavaScript is an array of arrays.

Accepted Answer

A one-dimensional array in JavaScript is a single list of elements, not an array of arrays. An array of arrays would be considered a two-dimensional array.

Question 4

To assign values to a 2-D array in JavaScript, create a one-dimensional array as usual, and then add a for loop that sets each array element to an array of its own.

Accepted Answer

To create a 2-D array in JavaScript, you start by creating a one-dimensional array. Then, you use a for loop to iterate through each element of this array, assigning to each element another array, thus creating a two-dimensional structure.

Question 5

If a two-dimensional array is organized in rows and columns, its values can be displayed row by row for easy readability.

Accepted Answer

Iterating through a two-dimensional array row by row allows for displaying its values in an organized manner that mirrors its row and column structure, enhancing readability.

Question 6

The solution for keeping multiple occurrences of similar variables is a(n) ____.

Accepted Answer

Arrays are used to store multiple values in a single variable, allowing for the management of similar variables efficiently.

Question 7

An array is a collection of variables called ____, each with the same name and data type.

Accepted Answer

Elements in an array are called elements. They are variables that share the same name and data type, but are distinguished by their indexes or positions within the array.

Question 8

A(n) ____ is a nonnegative integer used to identify an element in an array.

Accepted Answer

A subscript, also known as an index, is used to identify and access a specific element within an array by its position.

Question 9

What is the size of the following array?
Declare Numeric custNumber[10]
//Load custNumber array
CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

Accepted Answer

The size of the array is declared as 10, which means it can hold 10 elements, regardless of how many elements are actually assigned values in the given code snippet.

Question 10

Based on the information below, what is the value in the fourth position of the array?
Declare Numeric custNumber[10]

//Load custNumber array
CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

Accepted Answer

In programming, array indices start from 0. Therefore, the fourth position in the array corresponds to index 3, which is assigned the value 11532.

Question 11

Based on the information below, what is the value of the first element?
Declare Numeric custNumber[10]
//Load custNumber array

CustNumber[0] = 10001
CustNumber[1] = 10643
CustNumber[2] = 10922
CustNumber[3] = 11532
CustNumber[4] = 11765

Accepted Answer

The first element of the array custNumber is indexed at 0, and it is assigned the value 10001.

Question 12

Based on the information below, which of the following sets the tenth element of the array to 20643?
Declare Numeric custNumber[10]

Accepted Answer

In most programming languages, arrays are zero-indexed, meaning the first element is at index 0. Therefore, the tenth element is at index 9, making option B correct.

Question 13

Which of the following is considered an interactive array?

Accepted Answer

Option D is considered an interactive array because it involves interaction with the user, where the program prompts the user to input values into the array during runtime.

Question 14

JavaScript arrays are objects created (instantiated) with the keyword ____.

Accepted Answer

JavaScript arrays can be created by using the `new` keyword followed by `Array()`. For example, `let myArray = new Array();` instantiates a new array object.

Question 15

Which of the following creates an array of five book titles?

Accepted Answer

Using `new Array(5)` creates an array with a length of 5, but it doesn't initialize it with book titles. However, it correctly creates an array of the specified length.

Question 16

Which of the following creates an array with the elements 5, 19, 25, and 4?

Accepted Answer

The answer of Which of the following creates an array...

Question 17

A shorthand notation for decrementing a variable is ____.

Accepted Answer

The shorthand notation for decrementing a variable is "variable--", which decreases the value of the variable by one.

Question 18

A shorthand notation for incrementing a variable is ____.

Accepted Answer

The shorthand notation for incrementing a variable by one is "variable++".

Question 19

____ is the process of examining the elements of an array in order, looking for a match for a specific value.

Accepted Answer

Sequential search is the process where each element in an array is examined one by one in order until a match is found or the end of the array is reached. This is a straightforward method for finding a specific value within an array.

Question 20

The following algorithm depicts a ____ search.
// Prompt for customer number, search array for matches
Declare Numeric searchValue
Declare Numeric index = 0
Display "Enter the customer number you're looking for: "
Input searchValue

For index = 0 to SIZE - 1
If custNumber[index] == searchValue Then
Display "Match found at subscript: " + index
End If
End For

Accepted Answer

The algorithm provided is a sequential search, as it goes through each element in the array one by one until it finds a match or reaches the end of the array.

Quiz 10: Arrays