Book Image

Learn Red ? Fundamentals of Red

By : Ivo Balbaert
Book Image

Learn Red ? Fundamentals of Red

By: Ivo Balbaert

Overview of this book

A key problem of software development today is software bloat, where huge toolchains and development environments are needed in software coding and deployment. Red significantly reduces this bloat by offering a minimalist but complete toolchain. This is the first introductory book about it, and it will get you up and running with Red as quickly as possible. This book shows you how to write effective functions, reduce code redundancies, and improve code reuse. It will be helpful for new programmers who are starting out with Red to explore its wide and ever-growing package ecosystem and also for experienced developers who want to add Red to their skill set. The book presents the fundamentals of programming in Red and in-depth informative examples using a step-by-step approach. You will be taken through concepts and examples such as doing simple metaprogramming, functions, collections, GUI applications, and more. By the end of the book, you will be fully equipped to start your own projects in Red.
Table of Contents (13 chapters)

Word bindings

Within a Red program, several contexts can exist. A context is a scope in which a word can be defined, or as reducers say—a word is bound to a context. For example, within a function context a local word price may be used, and in another function the same word price may have a totally different meaning or value—the word price is used in different contexts.

Other types of contexts are within a block or within the entire script or environment (the global context). For example, if you put in type ? chocolate in the Red console, it prints the following:

No matching values were found in the global context.

Within a context, a word refers to a value, as in these examples:

;-- see Chapter03/
age: 62
is-integer?: false
lunch-time: 12:32
birth-day: 17-Jan-1997
friends: ["Jeff" "Paula" "Viviane"]

The preceding words are bound...