FND.09.01 BeginnerCore — asked often

Values, types and variables

Comes up in: Recruiter screen

This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.

What it covers

numbers, strings, booleans, null, undefined
let and const (avoid var for now)
naming
typeof
template literals

Words you will know

valuetypevariableconstantstring

What you will practise

10 tiny "what is printed" checks

Interview questions this answers

What is the difference between let, const and var? (beginner depth)
What is the difference between == and ===?
What is the difference between null and undefined?