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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 has word

To define a simple function that has no arguments but does have local variables that are defined in a block that comes before the code block, use has as follows:

calc-hours-year: has [number] [    number: 365 * 24 ; number is local    print number]   ;== func [/local number][...]calc-hours-year ;== 8760number   ; *** Script Error: number has no value 

The return value of  calc-hours-year shows that it is a function (func) with a local number variable that is not known outside of the function. Another way to look at it is that has turned the words in its first block into local variables.

=>  Now answer question 3 from the Questions section.

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Publisher Resources

ISBN: 9781789130706Supplemental Content