← All lessons/Variables & Data Types· Lesson 8 of 32

Booleans: true & false

Meet the boolean, a value that is only ever true or false, a gentle warm-up for conditionals.

About 5 min

Yes or no

A boolean is the simplest kind of value: it's either true or false, with no quotes. Booleans answer yes/no questions (*is the game over? is the door open?*) and they're the foundation for making decisions later.

Two booleans, printed.

NOTE

true and false are keywords. Never put them in quotes. "true" (with quotes) is a *string*, which is a different thing entirely.

Your turn

At the top level, declare a variable named isReady and set it to the boolean true (no quotes).

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