This book will introduce you to JavaScript's power and idiosyncrasies and guide you through the key features of the language and its tools and libraries. The book places equal focus on client- and server-side programming, and shows readers how to create interactive web content, build and test data services, and visualize data in the browser. Topics include: All of the material is covered by the Creative Commons Attribution-Noncommercial 4.0 International license (CC-BY-NC-4.0) and is included in the book's companion Maya Gans is a freelance data scientist and front-end developer by way of quantitative biology. is a bioinformatician turned community coordinator who works at the European Molecular Biology Laboratory. co-founded Software Carpentry, and is now part of the education team at RStudio