Nat Pryce

Duncan McGregor

It takes a week to travel the 8,000 miles overland from Java to Kotlin. If you're an experienced Java developer who has tried the Kotlin language, you were probably productive in about the same time. You'll have found that they do things differently in Kotlin, though. Nullability is important, collections are different, and classes are final by default. Kotlin is more functional, but what does that mean, and how should it change the way that you program? And what about all that Java code that you still have to support? Your tour guides Duncan and Nat first made the trip in 2015, and they've since helped many teams and individuals follow in their footsteps. Travel with them as they break the route down into legs like Optional to Nullable, Beans to Values, and Open to Sealed Classes. Each explains a key concept and then shows how to refactor production Java to idiomatic Kotlin, gradually and safely, while maintaining interoperability. The resulting code is simpler, more expressive, and easier to change. By the end of the journey, you'll be confident in refactoring Java to Kotlin, writing Kotlin from scratch, and managing a mixed language codebase as it evolves over time.

Java to Kotlin

Kotlin has raised the bar for programming languages on the Java Virtual Machine with its compatibility, readability, efficiency, and tool support. But adopting a new language can be daunting, especially when you're working with business-critical Java code that must meet changing requirements. This book takes a novel approach to introducing Kotlin to Java programmers: showing you how to gradually refactor Java code to idiomatic Kotlin while continuing to evolve its functionality. But converting Java to Kotlin is just the starting point. Kotlin has many features beyond Java. Using worked examples, authors Duncan McGregor and Nat Pryce guide you through honing the converted code to make it simpler, more efficient, more expressive, and easier to change. You'll learn how to take advantage of functional constructs to improve program structure, reliability, and error handling. Once you finish this book, you'll be confident writing Kotlin from scratch, converting your existing Java when appropriate, and managing a mixed Java-Kotlin codebase as it evolves over time.

A Refactoring Guidebook

David Simon

Peri-urban interfaces - the zones where urban and rural areas meet - suffer from the greatest problems to humans caused by rapid urbanization, including intense pressures on resources, slum formation, lack of adequate services such as water and sanitation, poor planning and degradation of farmland. These areas, home to hundreds of millions of people, face unique problems and need distinctive and innovative approaches and solutions. This book, authored by top researchers and practitioners, covers the full breadth and depth of the impacts of rapid urbanization on livelihoods, poverty and resources in the peri-urban zones in diverse African, Asian, Latin American and Caribbean contexts. Topics include peri-urban resource sustainability, ecosystems and societies and environmental changes in peri-urban zones. Rich case studies cover production systems and livelihoods including the impacts of irrigated vegetable production, horticulture, dairy enterprises, waste-fed fisheries and pastoral livelihoods. Also addressed are planning and development issues in the peri-urban interface including the difficulty in achieving sustainability, conflict and cooperation over resources, and a fresh look at the relationship between people and their environment. The final part of the book presents policies and strategies for promoting and measuring sustainability in peri-urban zones including community-based waste management, the co-management of watersheds and empowerment of the poor. This book is the most comprehensive examination of the challenges and solutions facing the people and environments of peri-urban zones and is essential reading for all practitioners, students and academics in geography and development.

Duncan McGregor

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