JavaScript Variable Declaration
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Questions and Answers

Which of the following is NOT a valid way to declare a variable in JavaScript?

  • var 1z = true; (correct)
  • var x = 5;
  • var a;
  • var y = 'hello';

    • Which option correctly declares a string variable in JavaScript?

  • var y == 'hello';
  • var y = 'hello'; (correct)
  • var: y = 'hello';
  • var y = 5;

    • Which variable name is not valid in JavaScript?

  • _y
  • 2z (correct)
  • $value
  • x

    • Which of the following correctly initializes a boolean variable in JavaScript?

    <p>var isTrue = true;</p> Signup and view all the answers

    Which syntax error would occur when declaring a variable using the keyword 'var'?

    <p>var 1z = true;</p> Signup and view all the answers

    ما هي الطريقة الصحيحة لاستخدام عامل الربط لدمج سلسلتين نصيتين في JavaScript؟

    <p>&quot;Hello&quot;+&quot;world&quot;</p> Signup and view all the answers

    ما هو بناء جملة عبارة if-else في JavaScript؟

    <p>if (شرط) { كود } else { كود }</p> Signup and view all the answers

    ما هي الوحدة التي ليست وحدة قياس صالحة في CSS؟

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

    ما هو التأشير الصحيح لأهم عنوان في HTML؟

    <p>h1</p> Signup and view all the answers

    هل يمكن للمستخدمين تعيين تفضيلات المتصفح الخاصة بهم؟

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

    Study Notes

    Declaring Variables in JavaScript

    • Variable y can be declared with the keyword var and assigned a string value, such as "hello".
    • Variable x can be declared with the keyword var and assigned a numeric value, such as 5.
    • Identifier 1z is not a valid variable name in JavaScript, as it starts with a number.
    • There is no such keyword as Ovar in JavaScript to declare a variable, so D-Ovar a is an invalid declaration.

    JavaScript Variables

    • var 1z = true is not a valid way to declare a variable in JavaScript.
    • Valid variable declarations include var y = "hello" and var x = 5.

    JavaScript String Concatenation

    • The correct way to use the concatenation operator to combine two strings is "Hello " + "world".

    JavaScript If-Else Statements

    • The syntax for an if-else statement is if (condition) { code block } else { code block }.

    CSS Units of Measurement

    • lb is not a valid unit of measurement in CSS.
    • Valid units of measurement in CSS include cm, px, em, and others.

    Browser Preferences

    • Users can set their own browser preferences, making True the correct answer.

    HTML Headings

    • The most important heading should be marked up as h1.
    • Headings in HTML should follow a hierarchical structure, with h1 being the most important and h6 being the least important.

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    Quiz Team

    Description

    This quiz tests your understanding of how to declare variables in JavaScript. Identify the invalid way to declare a variable in JavaScript.

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