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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

Copying a series

Red tries to reuse series and objects in memory as much as possible, for performance reasons. This means that using variables to point to the same series is often a bad idea and is the cause of hard-to-find bugs in your code. We have already told you in the Assigning and copying section in Chapter 3, Using Words, Values, and Types, that using copy is the safest way to ensure that your variables point to different memory locations. That way, changes to one variable don't affect the other.

To appreciate this fact, examine and try to predict the output of the following code:

;-- see Chapter05/copying.red:not-expected: [    var1: ""    append var1 "*"    print var1]loop 3 [do not-expected]

The do word executes the not-expected code block ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content