Skip to Content
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

Selecting an item – pick and /

We can select an item in two ways, using our data: [A B C D] series:

  • By specifying the item index in a so-called path notation, such as data/3 ;== C
  • By specifying the item index with pick, such as pick data 3 ;== C

=> Now answer question 6 from the Questions section.

If the item index is a variable, here represented by i, you need to use the :i get word notation:

i: 3data/:i      ;== Cdata/(i)     ;== C   ; this alternative works also
This is important to remember, because data/i doesn't give any error, but returns none. When the specified index is out of range, no error is generated, and the result is also none, for example, pick data 100 ;== none.

Strings are also series, so pick and / work for strings as well, with ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

How I Built a Personal Board of Directors With GenAI

How I Built a Personal Board of Directors With GenAI

Vipin Gupta
How to Become a Game-Changing Leader

How to Become a Game-Changing Leader

Douglas A. Ready, Alan Mulally
Why AI Demands a New Breed of Leaders

Why AI Demands a New Breed of Leaders

Faisal Hoque, Thomas Davenport, Erik Nelson

Publisher Resources

ISBN: 9781789130706Supplemental Content