Full Stack Web Development MASTERY Course - Novice to Expert - Data Types in JavaScript

The video tutorial covers the creation of variables in JavaScript using let, const, and var. It explains the different data types in JavaScript, dividing them into primitive and reference categories. Primitive data types include string, number, boolean, null, and undefined, while reference data types include arrays, objects, functions, and dates. The tutorial provides examples and explanations for each data type, highlighting JavaScript's dynamic nature compared to languages like C.

What is the purpose of creating an index.html file in the tutorial?

• To create a database

• To embed JavaScript code

• To write CSS styles

• To store data

Which keyword is used to declare a variable that can be reassigned in JavaScript?

• let

• const

• var

• function

What is a string data type in JavaScript?

• A collection of numbers

• An undefined value

• A collection of letters, numbers, or special characters

• A true or false value

How is a number treated if it is enclosed in quotes in JavaScript?

• As a number

• As undefined

• As a Boolean

• As a string

What is the difference between null and undefined in JavaScript?

• Null is a number, undefined is a string

• Null is an empty value, undefined is no value assigned

• Null is a Boolean, undefined is a number

• Null is a string, undefined is a Boolean

What is an array in JavaScript?

• A single number

• A collection of elements

• A function

• A true or false value

How are object literals defined in JavaScript?

• Using angle brackets

• Using curly braces

• Using parentheses

• Using square brackets

What is a key feature of JavaScript compared to C or C++?

• JavaScript is a static language

• JavaScript does not support functions

• JavaScript requires variable types to be declared

• JavaScript is a dynamic language

In JavaScript, what does the 'const' keyword do?

• Declares a variable that can be reassigned

• Declares a constant that cannot be reassigned

• Declares a function

• Declares a loop

What is the output of the following code: let x = '5'; console.log(typeof x);

• undefined

• boolean

• string

• number