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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

append

To add a new item to the end of a series, use the append word, which we have already encountered a few times:

append [10 11 12] 13       ;== [10 11 12 13]append [10 11 12] [13 14]  ;== [10 11 12 13 14]

As you can see, the item to be added can also be a series, in which case it blends into the first series. If you want to add it as a series, you have to use /only:

 append/only [10 11 12] [13 14]      ;== [10 11 12 [13 14]]

If you only want to add a limited number of items from a series, use /part

append/part [10 11 12] [13 14 15] 2 ;== [10 11 12 13 14]

Find out  what the /dup refinement is for using ? and try it out!

Here is a more complete code snippet that illustrates the use of append with foreach, using safe initialization with copy:

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Publisher Resources

ISBN: 9781789130706Supplemental Content