es6-const-let

Question 1

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

Answer 1

The code block is the code written inside a pair of curly braces { }. Examples would be the code block within the curly braces { } of an if or for statement.

Question 2

What does block scope mean?

Answer 2

The variables declared inside the block, can only be accessed inside that block.

Question 3

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

Answer 3

Block scope.

Question 4

What is the difference between let and const?

Answer 4

Let can be reassigned and const can’t.

Question 5

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

Answer 5

You can change the value, but the identifier cannot be reassigned.

Question 6

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

Answer 6

Use const unless you can’t.