JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Final Exercise Solution - Facebook Unfriend Funct

The video tutorial guides viewers through creating a JavaScript function called 'unfriend' that dynamically removes a friend from a Facebook user's list. It begins with setting up the function and accessing the friends array. Initial attempts to remove friends using incorrect methods are discussed, followed by a more effective approach using 'indexOf' and 'splice'. The tutorial concludes with error handling to manage cases where a friend does not exist in the list.

Why is it necessary to convert HTML data to JavaScript for the unfriend function?

• HTML data is not readable by JavaScript.

• JavaScript can only manipulate data in its own format.

• HTML data is too slow to process.

• JavaScript requires data to be in JSON format.

What arguments does the unfriend function take?

• An object and a number

• A friend and a date

• A string and a boolean

• An object and a friend

What is the primary focus when accessing the Facebook user's info?

• The entire object

• The user's profile picture

• The user's status updates

• The friends array within the object

What was the issue with using the delete method to remove a friend?

• It permanently deletes the entire array.

• It replaces the element with undefined instead of removing it.

• It requires too many arguments.

• It causes a syntax error.

What does the indexOf method help determine in the unfriend function?

• The length of the array

• The position of a friend in the array

• The total number of friends

• The type of data in the array

Why is it important to use dynamic code in the unfriend function?

• To make the code run faster

• To ensure the function can handle any input

• To reduce the size of the code

• To make the code easier to read

How does the splice method improve the removal of elements from an array?

• It removes elements without leaving undefined values.

• It duplicates the array.

• It sorts the array alphabetically.

• It adds new elements to the array.

What is the result of using splice with the correct index?

• The element is replaced with null

• The array is sorted

• The array is duplicated

• The element is removed without leaving undefined

What is the purpose of error handling in the unfriend function?

• To automatically refresh the page

• To provide feedback when a friend does not exist

• To ensure the function runs faster

• To add new friends to the list

What happens if you try to remove a friend who is not in the list?

• The function adds the friend to the list

• The function returns an error message

• The function crashes

• The function does nothing