gregnwosu

object Exercise8 {


  def main(args: Array[String]):Unit  = {
     Prop.run(maxProp)
   }


  def listOfGen[A](g: Gen[A]): Gen[List[A]] = Gen(sequence (List.fill(100)(g.sample)))

gregnwosu

#!/bin/bash -e

bindir=`pwd`/bin-tmp
mkdir -p $bindir
export PATH=$bindir:$PATH
function use_ld() {
        rm -f $bindir/ld
        ln -s $1 $bindir/ld
        echo "Using $1 for ld"
}                      

gregnwosu

Scala problems

(descending in severity, IMO)

ControlThrowable

Scala exposes runtime implementation details to users! See the pitfalls around catching Throwable: http://www.tzavellas.com/techblog/2010/09/20/catching-throwable-in-scala/

Increasing the visibility of private methods is not binary-compatible

https://issues.scala-lang.org/browse/SI-8899

gregnwosu

package nl.mdj.fpinscala

import akka.actor.Actor.Receive
import akka.actor.{Props, Actor, ActorSystem, ActorRef}
import akka.pattern.ask
import akka.util.Timeout
import nl.mdj.fpinscala.KeyValueStore.ListKeys
import scala.concurrent.{Await, Future}
import scala.concurrent.duration._
import scalaz._

gregnwosu

#System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

##Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

gregnwosu

module ChapterExercises where

import Data.Monoid ((<>))

data List a =
  Nil | Cons a (List a) deriving (Eq, Show, Ord)

instance Functor List where
  fmap _ Nil = Nil
  fmap f (Cons a l) = Cons (f a) (f<$>l)

gregnwosu

### Keybase proof

I hereby claim:

  * I am gregnwosu on github.
  * I am gregnwosu (https://keybase.io/gregnwosu) on keybase.
  * I have a public key whose fingerprint is 7E82 0848 D961 8907 487D  48B2 884D C0AF C389 330B

To claim this, I am signing this object:

gregnwosu

Keybase proof

I hereby claim:

• I am gregnwosu on github.
• I am gregnwosu (https://keybase.io/gregnwosu) on keybase.
• I have a public key whose fingerprint is 7E82 0848 D961 8907 487D 48B2 884D C0AF C389 330B

To claim this, I am signing this object:

gregnwosu

module SequenceTest where

import Criterion.Main
import qualified Data.Sequence as SQ

s :: SQ.Seq Int
s = SQ.fromList [1..9100]
lists :: [[Int]]
lists = replicate 10 [1..1000000]
seqs :: [SQ.Seq Int]

gregnwosu

FAILURE: Build failed with an exception.

* What went wrong:
Problem configuring task :run from command line.
> Unknown command-line option '--init'.

* Try:
Run gradlew help --task :run to get task usage details. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is: