Bools in

About Bools

Gleam represents true and false values with the Bool type. There are only two values: True and False. These values can be bound to a variable:

let true_variable = True
let false_variable = False

The &&, ||, and ! operators can be used to manipulate boolean values:

True && True  // -> True
True && False // -> False

False || True  // -> True
False || False // -> False

!False // -> True
!True  // -> False

The && and || operators use short-circuit evaluation, which means that the expression on the right-hand side of the operator is only evaluated if needed.

Each of the operators has a different precedence, where ! is evaluated before && and ||. Braces can be used to evaluate one part of the expression before the others:

!True && False   // -> False
!{True && False} // -> True