ES6 const and let

Question 1

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

Answer 1

code that runs within a function. Loops, functions, if, etc.

Any collection of curly braces

Question 2

What does block scope mean?

Answer 2

variables within a function - denotated by curly braces

Question 3

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

Answer 3

block scoped

Question 4

What is the difference between let and const?

Answer 4

const keyword values can’t be reassigned.

Let can be reassigned

Question 5

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

Answer 5

The value in which the const variable references is changeable

Question 6

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

Answer 6

If a variable should be constant use const and if a variable needs to be mutable use let.