Syntax Reference

Use this page when you want a compact reminder rather than a tutorial.

Modules

import Array from 'std:array'
import { parseUser } from './user.fs'

export readUser = (path: String): User => parseUser(path)
export type User = { id: String, name: String }

Bindings

answer = 42
{ name } = user
[first, second] = items

Functions

add = (a: Number, b: Number): Number => a + b

Types

type User = { id: String, name: String }
type Maybe<T> = T | Null

Control flow

if (active) { 'yes' } else { 'no' }

match (value) {
  'ok' => 'done'
  'error' => 'failed'
}

Other important reminders

blocks return their final expression
return is not part of Draft 0.1
arrays and records are immutable
generator arrows use *() => { ... }
defer expr creates explicit laziness