aiken/book/src/language-tour/bool.md

Bool

A Bool can be either True or False.

Aiken defines a handful of operators that work with Bools.

False && False // => False
False && True  // => False
True && False  // => False
True && True   // => True

False || False // => False
False || True  // => True
True || False  // => True
True || True   // => True

These are implemented using the plutus ifThenElse builtin.

a || b // => if a {True} else {b} -- ifThenElse(a, True, b)
a && b // => if a {b} else {False} -- ifThenElse(a, b, False)

An if statement decides on a boolean value.

fn negate(b: Bool) -> Bool {
    if b {
        False
    } else {
        True
    }
}