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Learn Red ? Fundamentals of Red
book

Learn Red ? Fundamentals of Red

by Ivo Balbaert
May 2018
Beginner content levelBeginner
252 pages
6h 19m
English
Packt Publishing
Content preview from Learn Red ? Fundamentals of Red

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/repetitions.red:count: 99forever [    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—t

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Publisher Resources

ISBN: 9781789130706Supplemental Content