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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 func word

To define a function with argument(s), use the func word, as shown in the following function that performs an increment: 

inc: func [n][n + 1] ;== func [n][n + 1]inc   ; *** Script Error: inc is missing its n argumentinc 7 ;== 8

Note that a func needs its argument to be passed as a parameter by the calling code; otherwise, you get the error ... is missing its ... argument. But, unlike most other programming languages, you don't have to enclose the parameters in parentheses () when you call the function.

By the way, you'll better understand the : or get word with a function example. The inc word (or better inc n) calls (evaluates) the function, but : returns its own value:

:inc          ;== func [n][n + 1]get 'inc      ;== func [n][n + 1] ...
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Publisher Resources

ISBN: 9781789130706Supplemental Content