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)

Understanding how parse works

The way parse works is quite straightforward. It's a function that takes an input to parse, and a set of rules to parse the input with—parse input [rules]

The input is the data that needs to be processed; it can be any series value. This is in most cases a string, perhaps coming from a web page, an XML or JSON or other type of file, or a spreadsheet, but it could also be a block with values, a binary value, or even code.

Parse searches the input and tries to pattern match it from start to finish with the rules. If the complete input until the end matches the rules, true is returned; if not, parse returns false. In fact, the rules block can be a complete subprogram, extracting information from the input, and processing that as well:

First parse...