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)

Structuring repetitions

Often, you need to repeat a block of code lines, either a number of times or while a certain condition holds true. The forever word lets you repeat an unlimited number of times. This should be used with caution—be sure to use break to get out of the infinite loop and continue with the rest of the program. The following snippet shows the life of a fervent book reader:

;-- see Chapter04/
count: 99
forever [
print append form count " books to read"
; print [form count " books to read"] ;-- same as append
count: count - 1
if count = 0 [break]
;== 99 books to read
;== 2 books to read
;== 1 books to read

We break out of the loop when the count down reaches 0.

We use append to join two strings together—the first is form count (which converts count to a string), and the second string is the rest of...