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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

The function word

The function word allows for the most complete function definition. We'll describe and show examples of all possible attributes in the next section. One key difference between it and the other forms is that function automatically makes its variables local, so /local is not necessary. Omitting /local from the previous example gives us function sum:

number: 108               ; globalsum: function [a b][    number: a + b         ; local    print number          ; local ]                         ;== func [a b /local number][...]sum 3 5                   ;== 8print number + 1          ;== 109 ; global

From the return value after the definition of sum, we can see that number is automatically made local—no conflict can occur between global and local values anymore.

If you really need to, you can force a variable ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content