Lesson 1 of 5 · 8 minutes

What is a variable?

A variable is a labelled box that holds a value.

let age = 25; makes a box named age and puts 25 inside. let means “make a new box.” The = sign puts the value inside. This is assignment.

The name is only a label. age is not 25. It names the box that holds 25. console.log(age) prints the value inside.

The code let age equals 25 connected to a box labelled age containing 25 — The name labels the box. The value goes inside.

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Change 25 to your age. The label stays the same; only the value changes.

Quick check

In let age = 25, what is age?

The name of a box that holds 25.Another way to write 25.A command that prints 25.

Choose one answer.

What does the = sign do here?

It puts the value on the right into the box on the left.It checks whether both sides are equal.It adds both sides.

Choose one answer.

You can now make a variable, put a value in it, and read it back.