Structures are defined at the module-level:

module sample

struct Person = { name, age, email }

function main = |args| {
  let p1 = Person("Mr Bean", 54, "bean@gmail.com")
  println(p1: name())
  let p2 = Person(): name("John"): age(32): email("john@b-root.com")
  println(p2: age())
}

When declaring a structure, it also defines two factory functions: one with no arguments, and one with all arguments in their order of declaration in the struct statement. When not initialized, member values are null.

Each member yields a getter and a setter method: given a member a, the getter is method a() while the setter is method a(newValue). It should be noted that setter methods return the structure instance which makes it possible to chain calls as illustrated in the previous example while building p2.