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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

Repeating a number of times – loop or repeat

If you need to execute a block a fixed number of times, the simplest way to do this is with loop:

n: 3 ;== 3loop n [prin "looping "] ;= looping looping looping ; recall: prin is no newline

In loop, you can't use the counter in the code block. If you need to do that, use repeat:

repeat i 5 [prin i]          ;== 12345

The repeat word has an index (here named i) that gets incremented automatically each time round the loop. The index counts from 1 to the second argument, which is the number of cycles. You can use and change i in the code block itself, but  i is reinitialized at the beginning of each loop, as you can see in the following code:

repeat i 5 [i: i + 2 prin i]   ;== 34567

=> Now answer question 6 from ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content