JavaScript Logical Operators Quiz
28 Questions
30 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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</p> Signup and view all the answers

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

    <p>main</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</p> Signup and view all the answers

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

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

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

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

    Which statement regarding A and B is true?

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

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

    <p>false</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</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</p> Signup and view all the answers

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

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

    Where does JavaScript usually run according to the text?

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

    Which operator is used in JavaScript for simple assignment?

    <p>=</p> Signup and view all the answers

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

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

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

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

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

    <p>boolean</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</p> Signup and view all the answers

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

    <p>object</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</p> Signup and view all the answers

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

    <p>5</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'</p> Signup and view all the answers

    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.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser