es6-const-let

Question 1

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

Answer 1

the area surrounded by curly braces { }. Example is a function, for, while, or if statement code block.

Question 2

What does block scope mean?

Answer 2

it means its scope is not global and is attached and exists only inside the current block

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

unlike let, const can’t be reassigned

Question 5

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

Answer 5

because the array itself can be changed but the const variable can’t be changed; the value of the const variable can be changed but the value itself can’t be reassigned.

Question 6

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

Answer 6

whether or not you want to reassign that variable or not and if it is in a block or not; use const unless you can’t