The Front-End Web Developer Bootcamp - HTML, CSS, JS, and React - Global and Local Var in JavaScript

The video tutorial covers five ways to declare variables in JavaScript, focusing on global and local variables. It explains the scope of these variables, demonstrating how global variables can be accessed both inside and outside functions, while local variables are confined to the function they are declared in. The tutorial includes practical examples to illustrate these concepts, emphasizing the importance of understanding variable scope in programming.

Which of the following is NOT a way to declare variables in JavaScript?

• var

• define

• let

• const

What is the initial value of a variable declared but not assigned in JavaScript?

• undefined

• null

• NaN

• 0

Where can a global variable be accessed in a JavaScript program?

• Only in the global scope

• Both inside and outside the function

• Only outside the function where it is declared

• Only inside the function where it is declared

What happens when you try to access a local variable outside its function?

• It returns null

• It returns the last assigned value

• It throws a reference error

• It returns undefined

Which statement best describes a local variable?

• It is a variable that can be accessed by all functions

• It is defined outside any function and accessible only within the global scope

• It is defined within a function and accessible only within that function

• It is accessible throughout the entire program