es6-const-let

Question 1

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

Answer 1

blocks are denoted by curly braces {}

functions, if statements, loops

Question 2

What does block scope mean?

Answer 2

Inside the code block.

Question 3

What is the scope of a variable declared withconstorlet?

Answer 3

Block scoped.

Question 4

What is the difference betweenletandconst?

Answer 4

The const keyword creates block-scoped variables whose values can’t be reassigned.
The variables declared by the let keyword are mutable. It means that you can change their values anytime you want

Question 5

Why is it possible to.push()a new value into aconstvariable that points to anArray?

Answer 5

actual value to which the const variable reference is not immutable.
We can change the array element

6

Question 6

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

Answer 6

By figuring out if the value will need to be reassigned.
Favor const over let.
Let lets you know the variable will be reassigned.