Closures

Question 1

In JavaScript, when is scope determined?

Answer 1

accessibility or visibility of variables

Question 2

What allows JavaScript functions to “remember” values from their surroundings?

Answer 2

Closures allow us to remember values from their surrounding.

Question 3

What values does a closure contain?

Answer 3

function bundled or enclosed with references to its surrounding state
any values referenced in the function

Question 4

When is a closure created

Answer 4

every time a function is created, at function creation time

Question 5

How can you tell if a function will be created as a closure?

Answer 5

the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment)
anytime it references something

Question 6

In React, what is one important case where you need to know if a closure was created?

Answer 6

useEffect()