5) JS Closures

Question 1

Explain closures

Answer 1

Closures occur whenever you define a function inside another function, the thing to know about them are what they mean for your code. Whenever you declare a function inside another function the inner function has access to the outer functions variables, even after the outer function returns.

Closures store references to variables. Meaning closure variables act as pointers to the variable values, and if the value changes the pointer will still point to those values.

Question 2

Because closures act as pointers they can go awry and lead to bugs. Explain.

Answer 2

When you change the outer function in a certain way it can cause issues with your closure functions reading of the variables its pointing to, this happens when you ???

To resolve this you use implement something called an IIFE, immediately invoked function expression.