gond

🔠 Multi-branch conditional expressions for Gleam

Types

opaque </>

Represents a branch of a conditional expressions.

pub opaque type Branch(a)

opaque </>

Represents a condition that can be evaluated lazily or eagerly,

pub opaque type Condition

opaque </>

Represents a condition that can be evaluated lazily or eagerly,

pub opaque type Consequence(a)

</>

pub fn cond(
  branches branches: List(Branch(a)),
  default alternative_fun: fn() -> a,
) -> a

Executes a list of branches and returns the consequence of the first branch that evaluates to true.

If no branch evaluates to true, the default alternative function is executed.

</>

pub fn fact(given condition: Bool) -> Condition

Creates a condition that holds a literal boolean value.

</>

pub fn run(
  on condition: Condition,
  consequence consequence_fun: fn() -> a,
) -> Branch(a)

Consequence to run if a previous condition evaluates to true.

</>

pub fn when(given condition_fun: fn() -> Bool) -> Condition

Creates a condition that evaluates to true if the given function returns true.

</>

pub fn yield(
  on condition: Condition,
  consequence consequence: a,
) -> Branch(a)

Literal consequence to yield if a previous condition evaluates to true.