jonjack

import java.time.LocalTime;
import java.util.concurrent.TimeUnit;

public class Timer {
    public static void main(String[] args) {
        LocalTime start = LocalTime.now();
	// some event to be timed
	LocalTime end = LocalTime.now();
	long delta = TimeUnit.NANOSECONDS.toMillis(end.toNanoOfDay() - start.toNanoOfDay());
	System.out.println("Time took: " + Double.valueOf(delta)/1000 + " seconds");

jonjack

We have a method to test which iterates over some List. The example is a validator service which iterates over a List of validators applying each one and returning when one fails ie. it returns an Optional containing an error message (this is just a concrete example to demonstrate Mockito and is not important to understand).

public class SomeValidationService implements ValidationService {

    /* List of validators which all encapsulate some different business validation logic */
    /* This gets injected say via Spring */
    private List<Validator> validators;
 
    public Optional<ErrorMessage> validateAction(final ObjectToValidate obj) {

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.

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

Mac Setup

Fonts

Check out Adobe Fonts.

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

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

#  ---------------------------------------------------------------------------
#
#  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

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

#!/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

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