cb372

alert('hi')

cb372

Keybase proof

I hereby claim:

• I am cb372 on github.
• I am cb372 (https://keybase.io/cb372) on keybase.
• I have a public key ASCYMnGniI49GycDeF7wL-osskKrzmEbfoRW25L5Xe1H_wo

To claim this, I am signing this object:

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

Amble

cb372

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

cb372

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]].

cb372

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

cb372

$ 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"'

cb372

$ 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

cb372

the: 458186
to: 222092
of: 201833
and: 184094
a: 175172
in: 158131
was: 83367
that: 82857
for: 73595
on: 71485

cb372

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")