David Black – författare

In David Black’s Canyoneering: A Guide to Techniques for Wet and Dry Canyons, readers learn the hazards and risks of canyoneering, the skills required to gain mastery of canyoneering style and technique, and simple, effective ways to negotiate hazardous terrain. This completed updated, thorough, and to-the-point guide will provide easily understood descriptions of skills used by leading-edge canyoneers and promote simple techniques for solving complex problems. The purpose of this book is to equip canyoneers at all levels with the technical skills they need to enjoy a clean canyoneering experience and avoid dangerous mistakes. This full-color book is the only guide endorsed by the American Canyoneering Association.Includes information on:

Like all young men of a certain age, Harry Gilmour had his own notion of how a naval battle should be. This wasn’t it.

Norway, 1940: Sub Lieutenant Harry Gilmour’s first encounter with battleship action is not the adventure he had hoped for. Faced with a thankless task and ill equipped to handle it, Gilmour’s inexperience leads to a damning allegation. His future hangs in the balance.

But then Lieutenant Peter Dumaresq steps in to offer him a lifeline—an advanced navigation course that will take him aboard a crack submarine, HMS Pelorus, under the command of a Royal Navy hero. Faced with a possible court martial, Harry chooses life underwater. Once aboard, however, Harry is confronted for the first time by the full horror of submarine warfare. If he can just overcome his fears, it will be the making of him.

Because survival itself is the challenge now. For Harry and the rest of the crew, the next depth charge could be the one that sinks them.

Spring, 1941. France has fallen but the Free French naval forces are in no mood to surrender. Royal Navy Sub-Lieutenant Harry Gilmour is also ready for action, despite the horrors of his first taste of submarine warfare.

When he is appointed as British Navy Liaison Officer aboard the Free French submarine Radegonde, he finds it anarchic, disorientating—and very French. Within its claustrophobic confines, suspicion and misunderstanding are rife.

So when Radegonde is sent on a mission to Martinique, it’s vital that these proud men learn to work together, especially as it seems everyone from Churchill to de Gaulle—not to mention Hitler—has a stake in the outcome.

Will Harry be able to navigate these dangerous waters safely and return with hard-won wisdom, or will old enemies arise to sink him?

As 1941 draws to a close, brave young men are fighting for freedom in countries across the globe. But for Sub-Lieutenant Harry Gilmour, washed up in neutral Spain alongside ‘interned belligerents’ from both sides of the war, hostilities have come to a pause.

Before long, his unlikely comrades must once again become his enemies, and he is back at the frontline of the battle for the Mediterranean. But aboard the submarine HMS Umbrage, operating in the waters off Malta, Harry is soon reminded that allies can be more dangerous than foes. When his volatile skipper is lost at sea, it falls to Harry to take charge of the boat—and of the lives of the men who now depend on him.

Ashore, there is another lesson: how war drives its wedge between more than just nations. Shirley is waiting for him back in Scotland, but the world offers many distractions for a young man…As Malta is besieged from the air and home seems ever further away, Harry must summon all his courage not only to stay alive—but also to forge in himself the nerve and the wisdom necessary to shoulder the responsibility of command.

Description

Ruby is a dynamic language perfect for creating applications, development tools, and administrative scripts.

The Well-Grounded Rubyist, Third Edition is a perfect tutorial for newcomers to Ruby and a great way for experienced Rubyists to deepen their understanding of the language.

Key features

·    Fully updated to cover the latest in Ruby 2.5

·    Clear explanations of Ruby concepts and how to apply them

·    Simple examples to seal in the learning

·    Prepares readers to use Ruby anywhere for any purpose

Audience

This book teaches Ruby from the ground up. The reader should have command of basic programming concepts in another language.

About the technology

Because it's the backbone of the well-loved Ruby on Rails web framework, Ruby has become one of the most popular programming languages in the world.

David A. Black is an internationally-known Ruby developer, author, trainer, speaker, and event organizer, as well as a co-founder of Ruby Central.

Joseph Leo III is a Ruby teacher, mentor, and community advocate. He is the lead organizer of the Gotham Ruby Conference (GoRuCo) and founder of Def Method.

To be an effective developer, you need to understand the principles behind the Ruby code. It is not just about knowing many functions, but also about understanding how Ruby developers approach problems. This book focuses on the most useful parts of the Ruby language and explains them with clear examples. It brings together years of experience in a simple and easy-to-read style. 

The Well-Grounded Rubyist guides you through the Ruby language. The book explains how Ruby works and how its object system is organised. It shows how Ruby handles method calls and how the language works in real code. The ideas are practical and can be used in everyday development work. 

After reading this book, you will understand the main ideas behind the Ruby language. You will be able to write clearer code and approach problems in the way experienced Ruby developers do. This book is for programmers who want to start working with Ruby or want to understand the language more deeply.