Generic Functions

Generic functions use type parameters such as a.

code
fn first(items: List(a)) -> a:
  case items:
    [head, .._] -> head

The same function can work with different element types.

code
let name = first(["Donna", "QBE"])
let number = first([1, 2, 3])

Generics are most useful for containers and small helpers.

code
fn identity(value: a) -> a:
  value

If the function needs behavior specific to a type, write the concrete function. Generics should reduce duplication, not hide intent.

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