jonjack

scala.collection.Searching provides binary search but you need an Indexed sequence (eg. Array), not a Linear sequence (eg. List). Search will still work on the List but you get linear O(n) behaviour rather than O(Log n).

case class Employee (id: Int, name: String, age: Int)

val emp1 = Employee(1, "Jane Doe", 45)
val emp2 = Employee(2, "Jon Doe", 54)
val emp3 = Employee(3, "Tera Patrick", 38)
val emp4 = Employee(4, "Jenna Jameson", 36)
val emp5 = Employee(5, "Aurora Snow", 34) // not added

jonjack

Some ideas I gathered from various places for working with Futures in for comprehensions.

Import what we need for all the examples.

import scala.concurrent.{Await, Future}
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global

jonjack

Metrics last collected 28.09.2018

Library	GitHub stars	Contract jobs (last 6 months) Source: itjobswatch.co.uk	Description
Play	10737	290	Fullstack web framework.
Akka	9054	222	For highly concurrent, distributed, and resilient message-driven applications on the JVM.
Scalatra	2321	2	Microframework port of Ruby’s Sinatra
Lift	1170

jonjack

#!/bin/sh

function abspath() { 
	pushd . > /dev/null; 
	if [ -d "$1" ]; then cd "$1"; dirs -l +0; 
	else cd "`dirname \"$1\"`"; cur_dir=`dirs -l +0`; 
	if [ "$cur_dir" == "/" ]; then echo "$cur_dir`basename \"$1\"`"; 
	else echo "$cur_dir/`basename \"$1\"`"; fi; fi; popd > /dev/null; 
}

jonjack

Set your global user details.

git config --global user.name "Your Name"
git config --global user.email your.email@elasticpath.com

Set your line feed settings.

jonjack

#  ---------------------------------------------------------------------------
#
#  Description:  This file holds all my BASH configurations and aliases
#
#  Sections:
#  1.   Environment Configuration
#  2.   Make Terminal Better (remapping defaults and adding functionality)
#  3.   File and Folder Management
#  4.   Searching
#  5.   Process Management

jonjack

The following scenario has multiple Optionals, a real example could be where you are calling multiple validation checks where each check returns an Optional<T>. You then want to check if each Optional contains a value or is empty - returning the first one that has a value. If none contain a value (ie. are instances of Optional.empty) then you return a default value.

In this example we are using Optional<Single> where Single is an RxJava Observer that returns a single value.

import com.google.common.collect.ImmutableList;

jonjack

Mac Setup

Fonts

Check out Adobe Fonts.

brew tap caskroom/fonts && brew cask install font-source-code-pro

jonjack

Return the max value of a List[Int] if unique, otherwise return -1.

def maxIfUnique(li: List[Int]) = li.groupBy(_.intValue).maxBy(_._1)._2 match {
  case x if x.size == 1 => x.head
  case _ => -1
}

scala> val list = List(1, 2, 1) // 2 is max and is unique

jonjack

Scenario: We have an interface that defines an operation.

public interface Validator {
  Optional validate(String subject, String subject2);
}

Some Validators only have 1 String to validate so we can extend the interface with a simpler one.