JavaScript Practice Lesson 1 of 21

Variables and expressions

A variable is a name for a value. const declares one that can't be reassigned - the right default for almost everything, since most values in a program never actually need to change after they're set. let exists for the rest.

An expression combines values into a new one: width * height, price + tax, a > b. You've been doing this in every calculator since childhood; JavaScript just wants the operators written out (* for multiply, not x) and a const or let in front the first time a name appears.

Your task: declare width as 8, height as 5, and area as their product.

You'll practice:

Declaring a variable with const
Writing an arithmetic expression
Building one variable's value out of two others

// Declare width as 8, height as 5, and area as their product.
const width = 0;
const height = 0;
const area = 0;