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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 local series

We mentioned this already in the Copying a series section in Chapter 5Working with Series and Blocks, but as this is a pitfall for new Red programmers, we will stress it again here—a series (also called a string) local to a function should be initialized with a copy. If not, the series will keep its value over subsequent function calls, which is an unexpected result for newcomers. Here is a correct example of how to initialize a local series using a function:

correct: function[] [    data: copy []             ; correct initialization!    append data 108    data]correct ;== [108]correct ;== [108]correct ;== [108]

Run the snippet with data: [] to see for yourself!

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Publisher Resources

ISBN: 9781789130706Supplemental Content