es6-const-let

Question 1

What is a code block? What are some examples of a code block?

Answer 1

A code block is a group of code within an opening and closing curly brace, an example would be functions, loops, ect.

Question 2

What does block scope mean?

Answer 2

The code inside of a block that is not visible outside of the block. The code is only available inside of the code block.

Question 3

What is the scope of a variable declared with const or let?

Answer 3

They should both be block scopes.

Question 4

What is the difference between let and const?

Answer 4

Let: works similar to be var (value can be changed)
Const: cannot be reassigned (value cannot change)

Question 5

Why is it possible to .push() a new value into a const variable that points to an Array?

Answer 5

Const defines reference, reference cannot be reassigned but value can be changed

Question 6

How should you decide on which type of declaration to use?

Answer 6

If the value needs to change: let, if the value doesnt need to change: const