dnaumenko

+(NSString *)describeOperandOnStack:(NSMutableArray *)stack withRootOperation:(NSString *)rootOperation {
    NSString *result = @"";
    
    id topOfStack = [stack lastObject];
    if (topOfStack) [stack removeLastObject];
    
    if ([topOfStack isKindOfClass:[NSNumber class]]) {
        result = [NSString stringWithFormat:@"%@", topOfStack];
    } else if ([topOfStack isKindOfClass:[NSString class]]) {
        NSString* operation = topOfStack;

dnaumenko

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

dnaumenko

{-# LANGUAGE ParallelListComp #-}
module Phone where

import Data.Char
import Data.List
import Data.Foldable

type Presses = Int
data Digit = One | Two | Three | Four | Five | Six | Seven | Eight | Nine | Zero | STAR | HASH deriving (Eq, Show)

dnaumenko

Don't use VPN services.

No, seriously, don't. You're probably reading this because you've asked what VPN service to use, and this is the answer.

Note: The content in this post does not apply to using VPN for their intended purpose; that is, as a virtual private (internal) network. It only applies to using it as a glorified proxy, which is what every third-party "VPN provider" does.

(A Russian translation of this article can be found here, contributed by Timur Demin.)

Why not?

dnaumenko

import cats.data.ReaderT
import cats.effect.{Concurrent, IO, Sync}
import cats.mtl.ApplicativeLocal
import fs2.Stream

object UpdateLocalContextProblem extends App {
  type Ctx = String
  type Header = String

  type ReaderIO[A] = ReaderT[IO, Ctx, A]

dnaumenko

# clean maven targets
find . -type d -name target -prune -exec rm -rf {} \;

dnaumenko

// from https://gitter.im/typelevel/cats-effect?at=5cdae78a5a887e1cd9e8a334

trait Shifter[F[_]] { 
  def shiftFair[A](fa: F[A]): F[A] 
} 

def fairShifter(n: Int): F[Shifter[F]] = 
  Ref.of(0).map { 
    new Shifter[F] { 
      def shiftFair(fa: F[A]): F[A] = ref.modify(i => (i+1, i%n == 0).ifM(shift >> fa, fa) 

dnaumenko

# vcs
brew install git

# jvm
brew install maven
brew install jenv # jenv local/global 1.8 to change if needed
# export PATH="$HOME/.jenv/bin:$PATH" in bash profile
# eval "$(jenv init -)"

# scala

dnaumenko

sealed trait Exit[+A] {
  def toEither: Either[Throwable, A]
}

object Exit {
  final case class Success[+A](value: A) extends Exit[A] {
    override def toEither: Either[Throwable, A] = Right(value)
  }
  
  sealed trait Failure extends Exit[Nothing]

dnaumenko

trait Env[Ctx, +A] {
  def map[B](f: A => B): Env[Ctx, B]
  def flatMap[B](f: A => Env[Ctx, B]): Env[Ctx, B]
  def void: Env[Ctx, Unit] = map(_ => ())
}