13. Booleans

The quick reference guide is on page 208 of the PDF.

Summary

• Functions end in ? if (and only if) they return a boolean value for their answer.

• true, false

• Determine the type of something: string?, number?, integer?, image?, boolean?

• Decide equality: string=?, image=?, etc.

• Comparisons for numbers: <, <=, =, >=, >

• Comparisons for other things: string<?, string<=?, string=?, etc.

• Case insensitive comparison: string-ci<?, etc.

• Combinations: and, or, not

Extras

• replicate
• string-contains?

Sections