djspiewak

Getting Started in Scala

This is my attempt to give Scala newcomers a quick-and-easy rundown to the prerequisite steps they need to a) try Scala, and b) get a standard project up and running on their machine. I'm not going to talk about the language at all; there are plenty of better resources a google search away. This is just focused on the prerequisite tooling and machine setup. I will not be assuming you have any background in JVM languages. So if you're coming from Python, Ruby, JavaScript, Haskell, or anywhere…  I hope to present the information you need without assuming anything.

Disclaimer It has been over a decade since I was new to Scala, and when I was new to Scala, I was coming from a Java and Ruby background. This has probably caused me to unknowingly make some assumptions. Please feel free to call me out in comments/tweets!

One assumption I'm knowingly making is that you're on a Unix-like platform. Sorry, Windows users.

Getting the JVM

carymrobbins

  /**
   * Pretty prints a Scala value similar to its source represention.
   * Particularly useful for case classes.
   * @param a - The value to pretty print.
   * @param indentSize - Number of spaces for each indent.
   * @param maxElementWidth - Largest element size before wrapping.
   * @param depth - Initial depth to pretty print indents.
   * @return
   */
  private def prettyPrint(a: Any, indentSize: Int = 2, maxElementWidth: Int = 30, depth: Int = 0): String = {

matiascarranza

Windows Registry Editor Version 5.00

[-HKEY_CLASSES_ROOT\Directory\Background\shell\Cmder]
[-HKEY_CLASSES_ROOT\Directory\shell\Cmder]

danharper

var gulp = require('gulp');
var sourcemaps = require('gulp-sourcemaps');
var source = require('vinyl-source-stream');
var buffer = require('vinyl-buffer');
var browserify = require('browserify');
var watchify = require('watchify');
var babel = require('babelify');

function compile(watch) {
  var bundler = watchify(browserify('./src/index.js', { debug: true }).transform(babel));

ericelliott

Essential JavaScript Links

I no longer mantain this list. There are lots of other very comprehensive JavaScript link lists out there. Please see those, instead (Google "awesome JavaScript" for a start).

matiascarranza

<iframe id="iframe" src="" class="iframe" seamless="" name="iframe"></iframe>

asterland

{
    "version": 3,
    "file": "example.js",
    "sourceRoot": "",
    "sources": ["example.ts"],
    "names": ["this", "_this"],
    "mappings": ";AAAA,QAAQ,CAAC,IAAI,CAAC,gBAAgB,CAAE,OAAO,EAAE;IACrC,KAAI,CAAC,WAAW,GAAG,aAAa;AACpC,CAAC,CAAC",
    "x_ms_scopes": "AA>IA<",
    "x_ms_locals": "AC,A"
}

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

danielcompton

=IF(B2<=14000,SUM(B2*10.5%),IF(B2<=48000,SUM(B2-14000)*17.5%+1470,IF(B2<=70000,SUM(B2-48000)*30%+7420,IF(B2>=70001,SUM(B2-70000)*33%+14020))))

jlong

var parser = document.createElement('a');
parser.href = "http://example.com:3000/pathname/?search=test#hash";

parser.protocol; // => "http:"
parser.hostname; // => "example.com"
parser.port;     // => "3000"
parser.pathname; // => "/pathname/"
parser.search;   // => "?search=test"
parser.hash;     // => "#hash"
parser.host;     // => "example.com:3000"