Modules

WARNING

Modules are still an early concept feature and are subject to change.

Importing and exporting code works using modules. To define a file to be a module you specify the this in the file itself using the mod keyword.

A module can only contain classes and functions in the top-level. Other code is not allowed within a module and should be added inside functions or classes.

All members are exported since there is no concept of visibility in the language.

// Set the module name for this file
mod math

fun: Int add(a: Int, b: Int) {
  return a + b
}

fun: Int subtract(a: Int, b: Int) {
  return a - b
}

Using functions or classes from a module is done using the use keyword.

// Use the "add" function from the "math" module
use math.add

val foo = add(12, 30)

When using multiple members from the same module it's also possible to use a special syntax using curly brackets. This way multiple members can be used with a single statement.

// Use the "add" and "subtract" functions from the "math" module
use math.{add, subtract}

val foo = add(12, 30)
val bar = subtract(100, 58)