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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

Assigning and copying

When you assign a variable to another variable, that new variable points to the same value as the first variable:

;-- see Chapter03/bindings.red:a: [1 2 3] b: a b ;== [1 2 3]

Here, b returns the value in the console, inside a script you would use probe b or print b. We could show this visually as follows:

If the value of a changes, for example, by appending 4, we see that b still has the same value as a, which is evident because it points to the same value storage in memory:

append a 4a ;== [1 2 3 4]b ;== [1 2 3 4]

Here's a visual representation that can help you grasp it better:

It works like that for more complex objects ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content