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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

switch and case

Suppose you have to test different values of a word, and each value requires a different action. How would you do it? You could use multiple if tests, phrased as if var = value1, but then you would have to add a new if for each new value to be tested, and all if tests would then be executed. Red has a versatile switch word, which allows you to do just that, but in one statement. For example:

person: "John"switch person [    "Bob"   [print "Bob is at the gym"]    "John"  [print "John is at work"]    "Laila" [print "Laila is shopping"]] ;== John is at work

The switch word evaluates the person word, and executes only the branch that corresponds to the same value.

If the value is not found, no branch is executed. In that case, it might be ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content