Multiple Choice Questions on Data Types in Web Development

📚 Quick Study Guide

• 🔢 String: Represents textual data. Enclosed in single quotes (' ') or double quotes (" "). Example: "Hello, world!"
• #️⃣ Number: Represents numeric values. Can be integers (e.g., 10) or floating-point numbers (e.g., 3.14).
• ✅ Boolean: Represents a logical value, either true or false.
• 🗄️ Null: Represents the intentional absence of a value. It's a special value that means "no value".
• Undefined: Represents a variable that has been declared but has not been assigned a value.
• 📦 Object: A complex data type that can store collections of key-value pairs. Example: { name: "John", age: 30 }
• Array: An ordered list of values. Example: [1, 2, 3, "apple"]

🧪 Practice Quiz

1. Which data type is used to represent textual information?
   1. A. Number
   2. B. Boolean
   3. C. String
   4. D. Object
2. Which data type represents a true/false value?
   1. A. String
   2. B. Number
   3. C. Boolean
   4. D. Null
3. What does the null data type represent?
   1. A. Zero
   2. B. An empty string
   3. C. Absence of a value
   4. D. Undefined value
4. Which of the following is an example of a Number data type?
   1. A. "123"
   2. B. true
   3. C. 123
   4. D. null
5. What is the data type of [1, 2, 3]?
   1. A. Object
   2. B. String
   3. C. Array
   4. D. Number
6. Which data type can store key-value pairs?
   1. A. String
   2. B. Array
   3. C. Object
   4. D. Boolean
7. What is the data type of a variable that has been declared but not assigned a value?
   1. A. Null
   2. B. String
   3. C. Undefined
   4. D. Object