ES6

Question 1

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

Answer 1

Anything enclosed in {}, example: if-else, for, do-while, while, try-catch.

Question 2

What does block scope mean?

Answer 2

Variables or data that exists within the 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

Const variables cannot be reassigned, the values or properties inside a const variable can be changed but the not value of the variable cannot 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 const only sets a freeze to the top layer of a variable, the values inside of a const variable can change but not the variable itself.

Question 6

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

Answer 6

Depending on the scope and how the variable will be used later on.

Question 7

What is the syntax for writing a template literal?

Answer 7

backtick with the variable names in {} and $. Ex: Hi my name is ${firstName} ${lastName} -> ‘Hi my name is Jumanah Almajnouni’

Question 8

What is “string interpolation”?

Answer 8

the ability to substitute part of the string for the values of variables or expressions