The Front-End Web Developer Bootcamp - HTML, CSS, JS, and React - Data Types

The video tutorial covers the seven data types in JavaScript: strings, numbers, booleans, arrays, objects, undefined, and null. It explains the differences between strings, numbers, and booleans, focusing on the use of double quotations. The tutorial also compares arrays and objects, highlighting when to use each based on the importance of element order. Finally, it demonstrates how to implement these data types in VS Code, providing practical examples and addressing common beginner mistakes.

Which of the following is NOT a primitive data type in JavaScript?

• Boolean

• Array

• Number

• String

What is the key difference between arrays and objects in JavaScript?

• Objects are used for numbers, arrays for strings

• Objects are faster than arrays

• Arrays maintain order, objects do not

• Arrays are immutable, objects are mutable

In JavaScript, which data type would you use if the order of elements is important?

• String

• Array

• Boolean

• Object

What will be the output if a variable is declared but not assigned a value in JavaScript?

• 0

• undefined

• null

• NaN

How do you check the data type of a variable in JavaScript?

• Using typeof operator

• Using dataType function

• Using checkType method

• Using getType function