Chris Birchall cb372

Preamble

Background: I've been writing mostly Scala for the last few years, mostly in FP style. I also have experience writing Java, Ruby, Python, bash and a few other languages.
Caveat: anything below which sounds like a grumble about the language is probably due to ignorance on my part. Please advise/correct me in the comments.
For a more eloquent writeup of a similar topic by somebody who can actually write Rust, see Lloyd's excellent blogpost

I hereby claim:

To claim this, I am signing this object:

	/*
	* By default Joda will parse an ISO 8601 string into a DateTime
	* with its timezone set to the _local_ timezone, not the one specified in the ISO string.
	* You can fix this by calling `withOffsetParsed()` on your formatter.
	*/

	scala> import org.joda.time.format._
	import org.joda.time.format._

	scala> new DateTime("2016-04-06T15:22:01Z")

	import scala.meta._
	import java.nio.file._

	object CommentWordCount extends App {

	val scalaDir = "/Users/chris/code/scala"
	val stdlibSrcDir = s"$scalaDir/src/library/scala"

	val scalaFileContents: Array[String] = Files.walk(Paths.get(stdlibSrcDir)).toArray.collect {
	case p: Path if p.toString.endsWith(".scala") => new String(Files.readAllBytes(p), "UTF-8")

	$ ss -s
	Total: 185 (kernel 0)
	TCP: 43 (estab 28, closed 7, orphaned 0, synrecv 0, timewait 6/0), ports 0

	Transport Total IP IPv6
	* 0 - -
	RAW 0 0 0
	UDP 14 8 6
	TCP 36 3 33
	INET 50 11 39

	$ curl 'https://content.guardianapis.com/search?tag=us-news/donaldtrump&q=%22reality%20tv%20star%22&page-size=200&from-date=2015-06-01&api-key=<api-key>' \| \
	jq -r '.response.results[].webPublicationDate' \| \
	cut -c1-7 \| \
	sort \| \
	uniq -c \| \
	gnuplot -e 'set terminal png; set output "test.png"; set xdata time; set timefmt "%Y-%m"; set xrange ["2015-06":"2016-08"]; set format x "%m/%Y"; plot "<cat" using 2:1 with lines title "Reality TV star"'

	import scala.reflect.macros.blackbox

	object PrettyPrinting {

	/*
	* Print a raw AST, nicely indented.
	* Pretty fragile, e.g. will get confused by string literals containing commas or parentheses.
	*/
	def prettyTree(raw: String): String = {
	var level = 0

	Welcome to the Ammonite Repl 0.8.0
	(Scala 2.11.8 Java 1.8.0_91)

	@ import scala.util.Try
	import scala.util.Try

	@ val listOfTries: List[Try[String]] = List(Try("a"), Try("b"), Try("c"))
	listOfTries: List[Try[String]] = List(Success("a"), Success("b"), Success("c"))

	// I have a List[Try[String]] but I actually want a Try[List[String]].

	Welcome to the Ammonite Repl 0.8.2
	(Scala 2.12.1 Java 1.8.0_121)
	@ import $ivy.`org.typelevel::cats:0.9.0`, cats._, cats.implicits._
	import $ivy.$ , cats._, cats.implicits._
	@
	@ trait Maths[F[_]] {
	def int(i: Int): F[Int]
	def add(l: F[Int], r: F[Int]): F[Int]
	}
	defined trait Maths