Question 1

In programming, names for values are called variables .

Accepted Answer

Variables are used in programming to store data values, and each variable is given a unique name to differentiate it from others and to access its value.

Question 2

The letter sequence that makes up a variable name is called a label .

Accepted Answer

The letter sequence that makes up a variable name is called an identifier, not a label. Identifiers are used to name variables, functions, classes, and other entities in code.

Question 3

In JavaScript, variables must be declared at the top of the program .

Accepted Answer

In JavaScript, variables can be declared anywhere in the program due to hoisting, but it's considered good practice to declare them at the beginning of their scope for readability and to avoid reference errors.

Question 4

A JavaScript variable cannot be initialized in the same statement in which it is declared .

Accepted Answer

In JavaScript, a variable can be both declared and initialized in the same statement. For example, `var x = 5;` declares a variable `x` and initializes it with the value `5` in one statement.

Question 5

In JavaScript strings must be enclosed in either single quotes (' . . . ') or double quotes (" . . . ") .

Accepted Answer

JavaScript allows strings to be enclosed in both single quotes ('...') and double quotes ("..."), treating them equivalently.

Question 6

The statement terminator in JavaScript is a colon (:) .

Accepted Answer

The statement terminator in JavaScript is a semicolon (;).

Question 7

The flow of an assignment statement is always right to left .

Accepted Answer

In programming, the value on the right side of an assignment statement is computed first and then assigned to the variable on the left.

Question 8

Relational operators cannot be used on strings .

Accepted Answer

Relational operators can be used on strings to compare them lexicographically, where the comparison is based on the Unicode value of each character in the strings.

Question 9

The outcome of a relational expression is always either true or false .

Accepted Answer

A relational expression compares two values and the result is always a Boolean value, either true or false, depending on whether the relation holds.

Question 10

The <then-statement> of an if statement only executes when the predicate is true .

Accepted Answer

The in an if statement is executed only when the condition (predicate) evaluated in the if statement is true. If the condition is false, the is skipped.

Question 11

When the of an if/else statement is false, the of the expression is executed .

Accepted Answer

If the Boolean expression evaluates to false, the else-statement or the code block under the else clause is executed.

Question 12

A correct solution to a programming problem is always an elegant solution .

Accepted Answer

A correct solution solves the problem, but an elegant solution does so efficiently and clearly, which is not always the case with every correct solution.

Question 13

In JavaScript, all variables must be initialized immediately following their declarations .

Accepted Answer

In JavaScript, variables can be declared without being initialized immediately. They can be initialized at a later point in the code.

Question 14

In programming the statement x = x + 1; makes no sense since no value can be the same as itself plus one .

Accepted Answer

This statement is a common way to increment the value of x by 1, assuming x has been previously defined and assigned a numeric value.

Question 15

Programming languages
A) automate the process of writing a program
B) allow for only one possible solution to a problem
C) are written in English sentences
D) are precise

Accepted Answer

Programming languages are precise, meaning they have specific syntax and semantics that must be followed to ensure the program functions correctly.

Question 16

Which of the following is a valid JavaScript variable name?
A) br549
B) Tax Rate
C) 37AB
D) 0123

Accepted Answer

A) "br549" is a valid JavaScript variable name because it starts with a letter and does not contain any spaces or illegal characters. Variables in JavaScript must begin with a letter, underscore (_), or dollar sign ($), and cannot start with a number. "Tax Rate" contains a space, which is not allowed. "37AB" starts with a number, which is also not allowed. "0123" is purely numeric, which is not a valid format for variable names.

Question 17

While specifics may vary from language to language, in general an identifier
A) must be made up only of letters
B) starts with two digits followed by an underscore and letters
C) cannot contain numbers, spaces, or special characters
D) starts with a letter and is followed by letters, numbers, or underscores

Accepted Answer

Identifiers in many programming languages can start with a letter (or sometimes an underscore) and may be followed by letters, numbers, or underscores. This allows for a wide range of names for variables, functions, etc., while maintaining a structure that is easy for both the compiler/interpreter and programmers to understand. Options A, B, and C are incorrect as they describe restrictions that are not universally applied across programming languages.

Question 18

In JavaScript the escape symbol is the
A) colon (:)
B) backslash (\)
C) slash (/)
D) semicolon (;)

Accepted Answer

The escape symbol in JavaScript is the backslash (\). It is used to indicate that the character following it should be treated in a special way, or literally, if it would otherwise have a different meaning in the context of the code.

Question 19

Which of the following is NOT a valid assignment statement, assuming length, width, and area are valid variables?
A) area = length * width;
B) area = 12345;
C) length * width = area;
D) area = "The area is 12,345 square feet . ";

Accepted Answer

In programming, the left side of an assignment statement must be a single variable that is being assigned a new value. Option C attempts to assign a value to an expression (length * width), which is not valid syntax in most programming languages.

Question 20

In JavaScript, the statement 17 % 5 results in
A) 3
B) 0 . 175
C) 3 . 4
D) 2

Accepted Answer

The answer of In JavaScript, the statement 17 % 5...

Quiz 17: Fundamental Concepts Expressed in Javascript

In programming, names for values are called variables .

The letter sequence that makes up a variable name is called a label .

In JavaScript, variables must be declared at the top of the program .

A JavaScript variable cannot be initialized in the same statement in which it is declared .

In JavaScript strings must be enclosed in either single quotes (' . . . ') or double quotes (" . . . ") .

The statement terminator in JavaScript is a colon (:) .

The flow of an assignment statement is always right to left .

Relational operators cannot be used on strings .

The outcome of a relational expression is always either true or false .

The <then-statement> of an if statement only executes when the predicate is true .

When the <Boolean expression> of an if/else statement is false, the <else-statement> of the expression is executed .

A correct solution to a programming problem is always an elegant solution .

In JavaScript, all variables must be initialized immediately following their declarations .

In programming the statement x = x + 1; makes no sense since no value can be the same as itself plus one .

Programming languages

Which of the following is a valid JavaScript variable name?

While specifics may vary from language to language, in general an identifier

In JavaScript the escape symbol is the

Which of the following is NOT a valid assignment statement, assuming length, width, and area are valid variables?

In JavaScript, the statement 17 % 5 results in