es6-const-let

Question 1

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

Answer 1

A block of code within curly braces. Examples: if else, for, do while, while, try catch, etc.

Question 2

What does block scope mean?

Answer 2

The variable is accessible within the block that is between the curly braces

Question 3

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

Answer 3

They are block-scoped

Question 4

What is the difference between let and const?

Answer 4

Let can be reassigned (they are mutable), const cannot be reassigned (immutable)

Question 5

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

Answer 5

The values within the array are mutable

Question 6

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

Answer 6

If the variable is not going to need to be reassigned, use ‘const’ (anything that can be a constant variable, should be). If it will need to be reassigned, then use ‘let’