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Zryna

4. Functions and modules

This lesson uses Zryna 0.2.1 source commit 841c8aee901782c9f7bf442bfe8eb2fe6b7f6446. Module discovery is defined by M2_MODULE_CLOSURE.md.

functions.zry imports one named function and keeps a helper private:

import { triple } from "./math.zry";


function addBonus(value: i32): i32 {
  return value + 2;
}


export function score(value: i32): i32 {
  return addBonus(triple(value));
}

math.zry supplies the imported function:

export function triple(value: i32): i32 {
  return value * 3;
}

Parameters and return values carry exact types. export exposes a function from its module; only scalar entry exports can be invoked by the public CLI. Private functions remain internal.

Terminal window
& $zryna run src/functions.zry `
  --project-root "$workspace\tutorial-control" `
  --profile control-flow-v1 `
  --target javascript `
  --name module-score `
  --export score `
  --arg=i32:10

Expected output: javascript: i32 32.

Imports must be explicit named imports with a relative .zry specifier. There are no default, wildcard, namespace, dynamic, URL, package-name, node_modules, or implicit-extension imports in this release.

Common errors

Section titled “Common errors”
  • A missing or wrong-case file is rejected rather than resolved approximately.
  • Cyclic module graphs are rejected.
  • Calling a function with the wrong arity or exact argument types is rejected before target execution.

Exercise

Section titled “Exercise”

Run score with i32:-4 on JavaScript and WebAssembly. Both targets should observe i32 -10.

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