Modern JavaScript from the Beginning - Second Edition - Immediately Invoked Function Expressions (IIFE)

The video tutorial introduces Immediately Invoked Function Expressions (IIFE) in JavaScript, explaining their syntax and usage. It highlights the benefits of using IIFE, such as avoiding global scope pollution and managing variable conflicts. The tutorial also covers how to pass parameters to IIFE and the concept of named IIFE, while cautioning against recursion due to potential infinite loops. The video concludes with a brief mention of upcoming function challenges.

What is one of the main reasons to use an IIFE in JavaScript?

• To make code more readable

• To avoid global scope pollution

• To reduce memory usage

• To increase execution speed

In the example provided, what issue arises when trying to declare a variable with the same name in different scripts?

• The variable is ignored

• A syntax error occurs

• The script fails to execute

• The variable is overwritten

How is an IIFE typically structured in JavaScript?

• As a named function followed by parentheses

• As an anonymous function enclosed in parentheses and immediately invoked

• As a function declared with 'var' keyword

• As a function declared with 'let' keyword

What happens if you try to access a variable declared inside an IIFE from outside its scope?

• The variable is automatically global

• The variable is undefined

• An error is thrown

• The variable is accessible

How can parameters be passed to an IIFE?

• By using global variables

• By passing them as arguments in the invocation parentheses

• By using the 'this' keyword

• By declaring them inside the function

What is a potential risk of using recursion within an IIFE?

• It can make the code unreadable

• It can slow down the script

• It can cause an infinite loop

• It can lead to a memory leak

Why might you create a named IIFE?

• To reduce code size

• To make it globally accessible

• For debugging purposes

• For better performance