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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

Converting types

A type determines the operations you can perform on its values; for example, adding strings doesn't exist in Red:

;-- see Chapter03/converting-types.red:"12" + "34"*** Script Error: + does not allow string! for its value1 argument*** Where: +

If what we really meant was adding two integers, then we must first convert the strings to integers with to-integer:

(to-integer "12") + (to-integer "34")  ; == 46

What happens if you remove the first pair of parentheses? Could you explain this?

When we remove the first pair of parentheses like in to-integer "12" + (to-integer "34") , we get the *** Script Error: + does not allow string! for its value1 argument. This is because + cannot add the string "12" to the integer 34.

Here are ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content