JavaScript Logical Operators Quiz
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Questions and Answers

What is the result of the expression (a && b) if a = 10 and b = 20?

  • false
  • 20
  • true (correct)
  • 10

When does the condition for the Logical OR operator (||) become true?

  • If all operands are equal
  • If both operands are zero
  • If any of the operands is zero
  • If both operands are non-zero (correct)

What does the Logical NOT operator (!) do to its operand?

  • Adds 1 to the operand
  • Reverses the logical state of the operand (correct)
  • Subtracts 1 from the operand
  • Multiplies the operand by 2

If a > b, what will be the result of (a || b)?

<p>true (A)</p> Signup and view all the answers

What is the method name that is mentioned in the text?

<p>main (B)</p> Signup and view all the answers

When executing JavaScript statements in a browser console, which key combination opens the developer tools in Chrome?

<p>CTRL SHIFT J (A)</p> Signup and view all the answers

What message will be displayed when the statement alert('Hello, World!'); is executed?

<p>'Hello, World!' (B)</p> Signup and view all the answers

Which of the following functions is used to prompt the user for input in JavaScript?

<p>prompt() (C)</p> Signup and view all the answers

What result will be obtained when evaluating the expression 5 + 3 * 2 in a JavaScript console?

<p>15 (C)</p> Signup and view all the answers

Which statement regarding A and B is true?

<p>(A &lt; B) is true. (A)</p> Signup and view all the answers

What is the result of !(a == b) if a is 10 and b is 10?

<p>false (B)</p> Signup and view all the answers

In JavaScript, what does the assignment operator '*' do?

<p>Multiplies right operand with the left operand and assigns the result to left operand (C)</p> Signup and view all the answers

What is the value of C if C -= A, where C is 15 and A is 7?

<p>8 (A)</p> Signup and view all the answers

What is one common use of JavaScript mentioned in the text?

<p>Displaying date/time (B)</p> Signup and view all the answers

Where does JavaScript usually run according to the text?

<p>Client-side (D)</p> Signup and view all the answers

Which operator is used in JavaScript for simple assignment?

<p>= (A)</p> Signup and view all the answers

What is a key benefit of running JavaScript on the client-side?

<p>Enhanced performance (C)</p> Signup and view all the answers

What does the conditional operator in JavaScript do?

<p>Assigns a value to a variable based on a condition (C)</p> Signup and view all the answers

How does imperative programming differ from declarative programming according to the text?

<p>Imperative languages specify each step to be taken (A)</p> Signup and view all the answers

If !(A && B) is false, what can you infer about the values of A and B?

<p>A and B are both true (B)</p> Signup and view all the answers

In what way do imperative programs read to the computer as described in the text?

<p>Straight to the instructions (B)</p> Signup and view all the answers

Which type of programming does JavaScript fall under based on the text?

<p>Imperative programming (A)</p> Signup and view all the answers

What does the 'typeof' operator return if its operand is a boolean value?

<p>boolean (B)</p> Signup and view all the answers

In JavaScript, how is the 'typeof' operator used?

<p>It is a unary operator placed before the operand (D)</p> Signup and view all the answers

If the operand of the 'typeof' operator is an object, what type does it return?

<p>object (A)</p> Signup and view all the answers

What does the following statement print: document.write('b is of type = ', typeof a);?

<p>b is of type = number (A)</p> Signup and view all the answers

In the 'Do It Yourself' section, what does the loop count up to?

<p>5 (B)</p> Signup and view all the answers

What values does the 'typeof' operator evaluate to besides number, string, boolean, object, function, undefined, and null?

<p>'date' (D)</p> Signup and view all the answers

Flashcards

Logical AND (&&)

Returns true if both operands are true, otherwise false.

Logical OR (||)

Returns true if at least one operand is true.

Logical NOT (!)

Reverses the boolean value of the operand.

Conditional Operator (ternary)

Returns one of two values based on a condition.

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typeof operator

Returns the type of a variable.

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JavaScript Client-Side

JavaScript code runs in the user's web browser.

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Imperative Programming

Gives step-by-step instructions to the computer.

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Declarative Programming

Focuses on what result is desired, not how to get it.

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alert('Hello, World!')

Displays a message box in a JavaScript program.

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prompt()

Prompts the user for input in JavaScript.

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5 + 3 * 2 (JavaScript)

Evaluates to 11.

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Assignment operator (=)

Assigns a value to a variable.

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Multiplication (*)

Calculates the product of two numbers.

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Subtraction Assignment (-=)

Subtracts a value from another variable.

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typeof (boolean)

Returns "boolean" if the operand is a boolean.

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typeof (object)

Returns "object" if the operand is an object.

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typeof (string)

Returns "string" if the operand is a string.

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typeof (number)

Returns "number" if the operand is a number.

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JavaScript typeof symbol

typeof can return "symbol".

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JavaScript typeof bigint

typeof can evaluate to "bigint".

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Conditional (if-else)

Executes code based on a condition being true or false.

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Chrome Dev Tools

Opens using Ctrl + Shift + I.

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Study Notes

Logical Operators

  • The expression (a &amp;&amp; b) will be true if both a and b are true; if a = 10 and b = 20, the expression will be true.
  • The Logical OR operator (||) becomes true if at least one of the operands is true.
  • The Logical NOT operator (!) negates the operand, converting true to false and vice versa.

Variables and Operators

  • If a &gt; b, the result of (a || b) will be a.
  • The assignment operator * is not used for simple assignment; it is used for multiplication.
  • The -= operator subtracts the value of A from C, so if C = 15 and A = 7, C will be 8.

JavaScript Basics

  • alert('Hello, World!') displays a message box with the text "Hello, World!".
  • prompt() is used to prompt the user for input in JavaScript.
  • Evaluating the expression 5 + 3 * 2 in a JavaScript console gives 11.
  • The method name mentioned in the text is not specified.
  • Pressing Ctrl + Shift + I opens the developer tools in Chrome.

Conditional Operator and typeof Operator

  • The conditional operator in JavaScript is a ternary operator that returns one of two values based on a condition.
  • The typeof operator returns the type of its operand, such as number, string, boolean, object, function, undefined, or null.
  • If the operand of the typeof operator is a boolean value, it returns "boolean".
  • If the operand of the typeof operator is an object, it returns "object".
  • The document.write('b is of type = ', typeof a); statement prints "b is of type = " followed by the type of a.

Programming Paradigms

  • JavaScript usually runs on the client-side.
  • A key benefit of running JavaScript on the client-side is that it reduces the load on the server.
  • Imperative programming differs from declarative programming in that imperative programming focuses on steps to accomplish a task, whereas declarative programming focuses on the desired outcome.
  • Imperative programs read to the computer as a series of commands.
  • JavaScript falls under imperative programming.

Miscellaneous

  • Besides number, string, boolean, object, function, undefined, and null, the typeof operator can evaluate to "symbol" or "bigint".
  • In the 'Do It Yourself' section, the loop counts up to 10.

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Description

Test your knowledge on logical operators in JavaScript with this quiz. Learn about the different logical operators used to determine the logic between variables or values.

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