global_vs_local.txt

1. What is scope?

Scope is where the variable can used. A variable declared globally means that it can accessed everywhere including in local scopes
such as functions or conditional statements.

2. Why are global variables avoided?

Global variables will overwrite other variables with the same binding name in local scopes such as functions. This will lead to 
unintended results. To avoid this, inside the function, redeclare that binding name so that it is set in that local environment.

3. Explain JavaScript 'strict mode'

It prevent binding names that are not set with var, let, or const to be declared globally.

4. What are side effects, and what is a pure function?

Any function that modifies anything that is out of its scope is a side effect and pure function always return the same result
given the same parameters.