ninjayoto

General Tip

"The trick is to catch exceptions at the proper layer, where your program can either meaningfully recover from the exception and continue without causing further errors, or provide the user with specific information, including instructions on how to recover from the error. When it is not practical for a method to do either of these, simply let the exception go so it can be caught later on and handled at the appropriate level."

Resources

Advantages of Exceptions
Excellent example of separating error-handling code from program logic

Three Rules for Effective Exception Handling
Longer explanation and case study of exception use, including the basic principles of "throw early" and "catch late". Clear and thorough.

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	import os
	import sys

	# constants, configure to match your environment
	HOST = 'http://localhost:9200'
	INDEX = 'test'
	TYPE = 'attachment'
	TMP_FILE_NAME = 'tmp.json'
	# for supported formats, see apache tika - http://tika.apache.org/1.4/formats.html
	INDEX_FILE_TYPES = ['html','pdf', 'doc', 'docx', 'xls', 'xlsx', 'xml']

	@Test
	public void postMessage()
	{
	driver.get("https://csc510-fall16.slack.com/");

	// Wait until page loads and we can see a sign in button.
	WebDriverWait wait = new WebDriverWait(driver, 30);
	wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("signin_btn")));

	// Find email and password fields.

	import com.petebevin.markdown.MarkdownProcessor
	import org.xhtmlrenderer.pdf.ITextRenderer
	import org.ccil.cowan.tagsoup.Parser
	import org.apache.xalan.xsltc.trax.SAX2DOM
	import org.xml.sax.InputSource

	buildscript{
	repositories {
	mavenCentral()
	maven {

	import java.time.*;
	import java.time.format.DateTimeFormatter;
	import java.time.format.FormatStyle;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.TemporalAdjusters;
	import java.util.*;

	import static java.time.temporal.TemporalAdjusters.*;

	public class Java8DateTimeExamples {

	import java.io.File;
	import java.io.FileNotFoundException;
	import java.io.IOException;
	import java.util.InputMismatchException;
	import java.util.Random;
	import java.util.Scanner;

	public class Exceptions {

	// An exception is an event that occurs during the execution of a program

	#!/usr/bin/env bash
	# https://developers.supportbee.com/blog/setting-up-cucumber-to-run-with-Chrome-on-Linux/
	# https://gist.github.com/curtismcmullan/7be1a8c1c841a9d8db2c
	# http://stackoverflow.com/questions/10792403/how-do-i-get-chrome-working-with-selenium-using-php-webdriver
	# http://stackoverflow.com/questions/26133486/how-to-specify-binary-path-for-remote-chromedriver-in-codeception
	# http://stackoverflow.com/questions/40262682/how-to-run-selenium-3-x-with-chrome-driver-through-terminal
	# http://askubuntu.com/questions/760085/how-do-you-install-google-chrome-on-ubuntu-16-04

	# Versions
	CHROME_DRIVER_VERSION=`curl -sS chromedriver.storage.googleapis.com/LATEST_RELEASE`

	userAgents=[
	/* 0 */"Mozilla/5.0 (X11; Linux i686) AppleWebKit/534.30 (KHTML, like Gecko) Ubuntu/10.10 Chromium/12.0.742.112 Chrome/12.0.742.112 Safari/534.30",
	/* 1 */"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/31.0.1650.63 Chrome/31.0.1650.63 Safari/537.36",
	/* 2 */"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0",
	/* 3 */"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
	/* 4 */"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
	/* 5 */"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
	/* 6 */"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.93 Safari/537.36",
	/* 7 */"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
	/* 8 */"Mozilla/5.0 (Windows NT 6.1; WOW64)