Turn your R code into packages that others can easily download and use. This practical book shows you how to bundle reusable R functions, sample data, and documentation together by applying author Hadley Wickham?s package development philosophy. In the process, you?ll work with devtools, roxygen, and testthat, a set of R packages that automate common development tasks. Devtools encapsulates best practices that Hadley has learned from years of working with this programming language. Ideal for developers, data scientists, and programmers with various backgrounds, this book starts you with the basics and shows you how to improve your package writing over time. You?ll learn to focus on what you want your package to do, rather than think about package structure. * Learn about the most useful components of an R package, including vignettes and unit tests * Automate anything you can, taking advantage of the years of development experience embodied in devtools * Get tips on good style, such as organizing functions into files * Streamline your development process with devtools * Learn the best way to submit your package to the Comprehensive R Archive Network (CRAN) * Learn from a well-respected member of the R community who created 30 R packages, including ggplot2, dplyr, and tidyr
Learn to build Rails-based web applications using all the latest features offered in Rails 5.2. Author Stefan Wintermeyer begins by teaching the basics of Ruby 2.5 before proceeding through all aspects of Rails, utilizing clean, succinct examples - rather than a single large application. This book covers topics including Active Storage, Credentials, Active Record, Scaffolding, REST, Routing, Bundler, Forms, Cookies, and Sessions, all of which are vital for modern Rails web applications. To complement these topics you´ll also learn about test-driven development, Action Cable, Active Job, Action Mailer, I18n, Asset Pipeline, and caching. Finally, you´ll see a how-to for a production web server with nginx. This complete set of skills will set you up for a future of efficient and elegant Rails coding. What You Will Learn Use the Ruby on Rails web development framework Install and manage the Rails framework Persist data for your web application with Active Record Work with forms Apply a test-driven development approach to your Rails-based web applications Discover many Rails secrets and tips Who This Book Is For Beginners with at least some prior programming experience. Ruby experience is helpful, but not required.
A Complete, Integrated Study System for OCP Exam 1Z0-809 Study for the OCP Java SE 8 Programmer II exam using this effective exam preparation guide from Oracle Press. Written by a team of experts, including two developers of the original exam, OCP Java SE 8 Programmer II Exam Guide (Exam 1Z0-809) offers comprehensive coverage of every subject on the test and lays out essential Java programming skills. Throughout, step-by-step exercises; self-tests; and ´´Exam Watch,´´ ´´Inside the Exam,´´ and ´´On the Job´´ sections highlight salient points and aid in learning. In all, the book and accompanying digital content feature more than 350 practice questions that mirror those on the live test in tone, format, and content. Clearly explains every topic on Exam 1Z0-809, including: .Declarations, access control, and enums .Object orientation .Assertions and exceptions .Dates, times, locales, and resource bundles .I/O and NIO .Generics and collections .Inner classes .Lambda expressions and functional interfaces .Streams .Threads .Concurrency .JDBC CD ICON Electronic content includes: .160 practice exam questions .Fully customizable test engine .Secured book PDF
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