Modern Web Design with HTML5, CSS3, and JavaScript - JavaScript Truthy and Falsy – Explained

The video tutorial explains the concept of truthy and falsy values in JavaScript. It describes how all values are considered truthy unless they are defined as falsy, such as false, zero, null, undefined, or NaN. The tutorial also covers how to work with variables and condition statements, providing examples of truthy and falsy values. It concludes with a recommendation to consult the Mozilla Developer Network for more information.

Which of the following is considered a falsy value in JavaScript?

• An empty array

• The value null

• The number 1

• The string 'false'

What is a truthy value in JavaScript?

• A value that is always false

• A value that is considered true in a boolean context

• A value that is null

• A value that is undefined

Which of the following is an example of a truthy value?

• 0

• An empty object

• null

• undefined

How is an undefined value treated in JavaScript?

• As a string

• As a falsy value

• As a truthy value

• As a number

What happens when you check a variable with no assigned value in a condition?

• It is treated as false

• It is treated as true

• It throws an error

• It is treated as a string