sjrd

Advance the support of Scala.js in Dotty, a tutorial

Dotty contains preliminary support for Scala.js under the flag -scalajs. Or rather, it contains the infrastructure for preliminary support. It is far from being actually usable, but this is where you can help!

This small tutorial walks you through a few steps that you can do to further the support of Scala.js in Dotty. Even if you do not typically contribute to a compiler, this can be your chance. It is not very difficult, given that there already exists an extensive test suite, as well as a working implementation for scalac.

nafg

import java.io._
import java.util.zip.ZipInputStream

import geny.Generator
import mill._
import mill.define.Target
import mill.scalajslib._


object WebpackLib {

jdegoes

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

rklaehn

import java.util

import ichi.bench.Thyme

import scala.collection.mutable.ArrayBuffer

object ArrayBufferInsertBench extends App {

  val th = Thyme.warmed(verbose = println)
  // val th = new Thyme()

gkossakowski

Specialization with method handles

Two canonical examples for specialization:

• Function1
• Tuple2

Function1 specialization

Specializing Function1 is a lot easier because functions do not have specialized fields.