Modern Web Design with HTML5, CSS3, and JavaScript - Function Scope in JavaScript

The video tutorial explains the concept of function and global scope in programming. It covers how variables declared within a function are not accessible outside of it, and how global variables can be accessed by functions. The tutorial provides examples of variable access in different scopes, including nested functions. It also addresses common errors in scope usage and demonstrates how to correct them. Advanced concepts such as scope hierarchy and parent scope are discussed to give a comprehensive understanding of how scopes work in programming.

What is the main reason for using global scope in a function?

• To make the code run faster

• To make the function more complex

• To prevent errors in the code

• To access variables outside the function

In the context of nested functions, which statement is true?

• Nested functions do not have a scope

• Nested functions are always global

• Nested functions can only access variables within their own scope

• Nested functions can access variables from any scope

What happens to the global variable 'total' each time the 'adder' function is run?

• It is reset to zero

• It is incremented

• It remains unchanged

• It is decremented

What was the error in the calculation function example?

• Incorrect variable names

• Missing return statement

• Incorrect function call

• Reversed assignment and addition

How can you make the code cleaner when dealing with local variables?

• By using more nested functions

• By not passing them as parameters if they are in the parent scope

• By using global variables instead

• By removing all variable references

What will be the output if A and B are not defined in the local scope?

• The function will not execute

• The function will use the parent scope values

• The function will return zero

• The function will throw an error

What is the significance of curly brackets in the context of scope?

• They are used for comments

• They define a new global scope

• They indicate the end of a function

• They define a new local scope