By Avdi Grimm
It is a publication approximately Ruby, and approximately pleasure.
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Extra info for Confident Ruby
You want instances of other classes to be implicitly converted to the needed type, if possible. For instance, your method expects to work with a Meter type, but you would like to leave the possibility open for Feet or other units to be supplied instead. Synopsis Define your own conversion protocol for converting arbitrary objects to instances of the target class. Rationale A well-documented protocol for making arbitrary objects convertible to our own types makes it possible to accept third-party objects as if they were “native”.
Avoiding the MacGyver method That was an awfully formalized, even stylized, procedure for arriving at a method definition. And yet for all that formality, you probably noticed that there was something missing from the process. We never once talked about the already existing classes or methods defined in the system. We didn’t discuss the app’s strategy for persisting data such as customer records; whether it uses an ORM, and if so, what the conventions are for accessing data stored in it. We didn’t even talk about what class we are defining this method on, and what methods or attributes it might already have.
End Listing 12: A class implicitly convertable to string Unlike Time, when we use String#+ to combine a String with an ArticleTitle, it works. new("A Modest Proposal") "Today’s Feature: " + title # => "Today’s Feature: A Modest Proposal" Listing 13: Using the ArticleTitle class as a String This is because we implemented ArticleTitle#to_str, signaling to Ruby that an ArticleTitle is string-like, and it’s OK to implicitly convert it to a string in methods which normally expect one. Explicit conversions like #to_s are a different story.