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)

The structure of a Red program

Until now, we have mostly used snippets of code, but a complete Red program starts with a Red [] block, called its header. If this is not present, the compilation stops immediately with the following message:

*** Syntax Error: Invalid Red program

Why is it needed? It must be there to signal that the file contains a script and not just random text; in fact, the .red extension is not at all needed for the compiler to work.

An empty header, such as the one we used, is not usually a good idea. In fact, the header is an information block that can contain all kinds of (meta)-info and documentation about the program, in the form of a series of pairs enclosed between rectangular brackets [ ]:

Red [
Name-Of-Info: "Value of Info"
Name-Of-Info2: "Value of Info2"

The header provides information to you and other developers, and...