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Question 1

Scoping

Answer 1

How our program’s variables are organized and accessed

Question 2

Lexical Scoping

Answer 2

the ability for a function to access variables from parent scope

Question 3

Scope

Answer 3

Space or environment in which a certain variable is declared

Question 4

Scope of a variable

Answer 4

region of our code where a certain variable can be accessed

Question 5

3 Types of Scope

Answer 5

1. Global Scope: variables are accessible everywhere
2. Function (local) Scope: variables are accessible only inside function, not outside
3. Block Scope (ES6): variables are accessible only inside block (only applies to let and const variables); IN STRICT MODE: functions are also block scoped

Question 6

Scope Chain

Answer 6

every scope always has access to all the variables from all its outer scopes: THIS is the scope chain!

Question 7

Variable Lookup

Answer 7

when a variable is not in the current scope, the engine looks up in the scope chain until it finds the variable it’s looking for