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</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.

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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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