Lesson 3 of 5 · 7 minutes

True or false: booleans

Some questions have only two answers: yes or no, on or off. Code uses a boolean for this.

A boolean can only be true or false. Write both without quotes. "true" is text, not a boolean.

Think of a light switch. It has two positions. A boolean works the same way. This simple type will control decisions in the next module.

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Change true to false, then run it again.

Quick check

Which values can a boolean hold?

Only true or false.Yes, no, or maybe.Any number.

Choose one answer.

Is "true" with quotes a boolean?

No. It is a string.Yes. The spelling is what matters.It depends on the variable name.

Choose one answer.

You now know the third basic type: a boolean, always either true or false.