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Questions and Answers
Which data type would be used to represent a person's age in JavaScript?
Which data type would be used to represent a person's age in JavaScript?
What will be the output of console.log(typeof favoriteColor) if favoriteColor is declared but not initialized?
What will be the output of console.log(typeof favoriteColor) if favoriteColor is declared but not initialized?
If you want to store a collection of colors in a specific order, which data type should you use?
If you want to store a collection of colors in a specific order, which data type should you use?
Which operator is used in JavaScript to check the data type of a value?
Which operator is used in JavaScript to check the data type of a value?
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What data type represents a unique and immutable value in JavaScript?
What data type represents a unique and immutable value in JavaScript?
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Study Notes
JavaScript Data Types
-
Number: Represents numerical values (integers or decimals). Example:
let age = 25; -
String: Represents a sequence of characters (text). Example:
let name = 'John Doe'; -
Boolean: Represents a true or false value. Example:
let isAdmin = true; -
Null: Indicates an empty or unknown value. Example:
let favoriteFood = null; -
Undefined: Represents an uninitialized or undeclared variable. Example:
let favoriteColor;(no value assigned) -
Object: Represents a collection of key-value pairs. Example:
let person = { name: 'John Doe', age: 25 }; -
Array: Represents an ordered collection of values. Example:
let colors = ['red', 'green', 'blue']; -
Symbol (ES6+): Represents a unique and immutable value. Example:
let uniqueId = Symbol('unique-id');
Checking Data Types
- Use the
typeofoperator to determine a value's data type. - Example:
console.log(typeof name);will output the data type of the variablename.
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Description
Test your knowledge of JavaScript data types with this quiz! You'll encounter questions about numbers, strings, booleans, and more. Discover how well you understand the different data types and their usage in JavaScript programming.
