mp911de

/*
 * Copyright 2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

jdegoes

class Option<A> {
  protected Option() { }
}
interface App<F, A> {
  F proof();
}
class OptionF  {
  private OptionF() {}
  
  private static class AppOption<A> implements App<OptionF, A> {

danhyun

public class Reader<R, A> {
    private final Function<R, A> run;

    public Reader(Function<R, A> run) { this.run = run; }

    public <B> Reader<R, B> map(Function<A, B> f) {
        return new Reader<>( r -> f.apply((apply(r))) );
    }

    public <B> Reader<R, B> flatMap(Function<A, Reader<R, B>> f) {

joergrathlev

import java.util.function.Function;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

public class Demo {

    /**
     * An IO operation that results in a value of type T.

mobilemind

# delete local tag '12345'
git tag -d 12345
# delete remote tag '12345' (eg, GitHub version too)
git push origin :refs/tags/12345
# alternative approach
git push --delete origin tagName
git tag -d tagName

ms-tg

/**
 * ```
 * Does JDK8's Optional class satisfy the Monad laws?
 * =================================================
 *   1.  Left identity:  true
 *   2.  Right identity: true
 *   3.  Associativity:  true
 *
 * Yes, it does. 
 * ```

blouerat

/*
Based on the second part of the talk "Dead-Simple Dependency Injection in Scala" by @runarorama at NEScala 2012
http://marakana.com/s/dependency_injection_in_scala,1108/index.html
*/

sealed trait KVS[A]
case class Put[A](key: String, value: String, a: A) extends KVS[A]
case class Get[A](key: String, h: String => A) extends KVS[A]
case class Delete[A](key: String, a: A) extends KVS[A]