Scope

gistfile1.txt

Questions
What is scope? Your explanation should include the idea of global vs. local scope.
Scope determines what parts of the code have direct access to a variable and can mutate that variable's value. A global variable
can be accessed by all parts of the code and can be changed in any place where it is accessed. A local variable can only be accessed or 
changed within the function block that it is defined in. 

Why are global variables avoided?
Global variables are able to be changed in any part of the code, so it makes programs indeterminate. If a value of a global variable is 
changed then it's difficult to know where that change occurred. 

Explain JavaScript's strict mode
Strict mode will throw an error if a variable is used in a function without declaring with a let, var, or const. This helps to eliminate 
global variables

What are side effects, and what is a pure function?
Side effects are changes to variables outside of a function. Usually occur when global variables are used. A pure function has no 
side effects